b4c76fa721
reiserfs_write_full_page does zero bytes in the file past eof, but it may call get_block on those buffers as well. On machines where the page size is larger than the blocksize, this can result in mmaped files incorrectly growing up to a block boundary during writepage. The fix is to avoid calling get_block for any blocks that are entirely past eof Signed-off-by: Chris Mason <mason@suse.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
3018 lines
87 KiB
C
3018 lines
87 KiB
C
/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/reiserfs_fs.h>
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#include <linux/reiserfs_acl.h>
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#include <linux/reiserfs_xattr.h>
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#include <linux/smp_lock.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <asm/uaccess.h>
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#include <asm/unaligned.h>
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#include <linux/buffer_head.h>
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#include <linux/mpage.h>
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#include <linux/writeback.h>
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#include <linux/quotaops.h>
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extern int reiserfs_default_io_size; /* default io size devuned in super.c */
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static int reiserfs_commit_write(struct file *f, struct page *page,
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unsigned from, unsigned to);
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static int reiserfs_prepare_write(struct file *f, struct page *page,
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unsigned from, unsigned to);
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void reiserfs_delete_inode(struct inode *inode)
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{
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/* We need blocks for transaction + (user+group) quota update (possibly delete) */
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int jbegin_count =
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JOURNAL_PER_BALANCE_CNT * 2 +
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2 * REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb);
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struct reiserfs_transaction_handle th;
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int err;
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truncate_inode_pages(&inode->i_data, 0);
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reiserfs_write_lock(inode->i_sb);
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/* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
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if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) { /* also handles bad_inode case */
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reiserfs_delete_xattrs(inode);
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if (journal_begin(&th, inode->i_sb, jbegin_count))
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goto out;
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reiserfs_update_inode_transaction(inode);
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err = reiserfs_delete_object(&th, inode);
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/* Do quota update inside a transaction for journaled quotas. We must do that
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* after delete_object so that quota updates go into the same transaction as
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* stat data deletion */
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if (!err)
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DQUOT_FREE_INODE(inode);
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if (journal_end(&th, inode->i_sb, jbegin_count))
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goto out;
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/* check return value from reiserfs_delete_object after
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* ending the transaction
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*/
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if (err)
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goto out;
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/* all items of file are deleted, so we can remove "save" link */
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remove_save_link(inode, 0 /* not truncate */ ); /* we can't do anything
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* about an error here */
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} else {
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/* no object items are in the tree */
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;
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}
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out:
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clear_inode(inode); /* note this must go after the journal_end to prevent deadlock */
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inode->i_blocks = 0;
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reiserfs_write_unlock(inode->i_sb);
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}
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static void _make_cpu_key(struct cpu_key *key, int version, __u32 dirid,
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__u32 objectid, loff_t offset, int type, int length)
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{
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key->version = version;
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key->on_disk_key.k_dir_id = dirid;
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key->on_disk_key.k_objectid = objectid;
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set_cpu_key_k_offset(key, offset);
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set_cpu_key_k_type(key, type);
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key->key_length = length;
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}
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/* take base of inode_key (it comes from inode always) (dirid, objectid) and version from an inode, set
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offset and type of key */
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void make_cpu_key(struct cpu_key *key, struct inode *inode, loff_t offset,
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int type, int length)
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{
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_make_cpu_key(key, get_inode_item_key_version(inode),
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le32_to_cpu(INODE_PKEY(inode)->k_dir_id),
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le32_to_cpu(INODE_PKEY(inode)->k_objectid), offset, type,
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length);
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}
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//
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// when key is 0, do not set version and short key
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//
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inline void make_le_item_head(struct item_head *ih, const struct cpu_key *key,
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int version,
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loff_t offset, int type, int length,
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int entry_count /*or ih_free_space */ )
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{
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if (key) {
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ih->ih_key.k_dir_id = cpu_to_le32(key->on_disk_key.k_dir_id);
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ih->ih_key.k_objectid =
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cpu_to_le32(key->on_disk_key.k_objectid);
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}
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put_ih_version(ih, version);
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set_le_ih_k_offset(ih, offset);
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set_le_ih_k_type(ih, type);
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put_ih_item_len(ih, length);
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/* set_ih_free_space (ih, 0); */
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// for directory items it is entry count, for directs and stat
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// datas - 0xffff, for indirects - 0
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put_ih_entry_count(ih, entry_count);
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}
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//
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// FIXME: we might cache recently accessed indirect item
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// Ugh. Not too eager for that....
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// I cut the code until such time as I see a convincing argument (benchmark).
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// I don't want a bloated inode struct..., and I don't like code complexity....
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/* cutting the code is fine, since it really isn't in use yet and is easy
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** to add back in. But, Vladimir has a really good idea here. Think
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** about what happens for reading a file. For each page,
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** The VFS layer calls reiserfs_readpage, who searches the tree to find
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** an indirect item. This indirect item has X number of pointers, where
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** X is a big number if we've done the block allocation right. But,
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** we only use one or two of these pointers during each call to readpage,
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** needlessly researching again later on.
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**
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** The size of the cache could be dynamic based on the size of the file.
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**
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** I'd also like to see us cache the location the stat data item, since
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** we are needlessly researching for that frequently.
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**
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** --chris
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*/
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/* If this page has a file tail in it, and
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** it was read in by get_block_create_0, the page data is valid,
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** but tail is still sitting in a direct item, and we can't write to
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** it. So, look through this page, and check all the mapped buffers
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** to make sure they have valid block numbers. Any that don't need
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** to be unmapped, so that block_prepare_write will correctly call
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** reiserfs_get_block to convert the tail into an unformatted node
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*/
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static inline void fix_tail_page_for_writing(struct page *page)
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{
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struct buffer_head *head, *next, *bh;
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if (page && page_has_buffers(page)) {
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head = page_buffers(page);
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bh = head;
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do {
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next = bh->b_this_page;
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if (buffer_mapped(bh) && bh->b_blocknr == 0) {
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reiserfs_unmap_buffer(bh);
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}
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bh = next;
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} while (bh != head);
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}
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}
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/* reiserfs_get_block does not need to allocate a block only if it has been
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done already or non-hole position has been found in the indirect item */
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static inline int allocation_needed(int retval, b_blocknr_t allocated,
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struct item_head *ih,
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__le32 * item, int pos_in_item)
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{
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if (allocated)
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return 0;
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if (retval == POSITION_FOUND && is_indirect_le_ih(ih) &&
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get_block_num(item, pos_in_item))
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return 0;
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return 1;
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}
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static inline int indirect_item_found(int retval, struct item_head *ih)
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{
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return (retval == POSITION_FOUND) && is_indirect_le_ih(ih);
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}
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static inline void set_block_dev_mapped(struct buffer_head *bh,
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b_blocknr_t block, struct inode *inode)
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{
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map_bh(bh, inode->i_sb, block);
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}
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//
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// files which were created in the earlier version can not be longer,
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// than 2 gb
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//
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static int file_capable(struct inode *inode, long block)
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{
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if (get_inode_item_key_version(inode) != KEY_FORMAT_3_5 || // it is new file.
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block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb
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return 1;
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return 0;
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}
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/*static*/ int restart_transaction(struct reiserfs_transaction_handle *th,
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struct inode *inode, struct path *path)
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{
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struct super_block *s = th->t_super;
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int len = th->t_blocks_allocated;
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int err;
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BUG_ON(!th->t_trans_id);
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BUG_ON(!th->t_refcount);
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/* we cannot restart while nested */
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if (th->t_refcount > 1) {
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return 0;
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}
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pathrelse(path);
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reiserfs_update_sd(th, inode);
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err = journal_end(th, s, len);
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if (!err) {
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err = journal_begin(th, s, JOURNAL_PER_BALANCE_CNT * 6);
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if (!err)
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reiserfs_update_inode_transaction(inode);
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}
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return err;
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}
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// it is called by get_block when create == 0. Returns block number
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// for 'block'-th logical block of file. When it hits direct item it
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// returns 0 (being called from bmap) or read direct item into piece
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// of page (bh_result)
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// Please improve the english/clarity in the comment above, as it is
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// hard to understand.
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static int _get_block_create_0(struct inode *inode, long block,
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struct buffer_head *bh_result, int args)
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{
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INITIALIZE_PATH(path);
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struct cpu_key key;
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struct buffer_head *bh;
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struct item_head *ih, tmp_ih;
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int fs_gen;
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int blocknr;
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char *p = NULL;
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int chars;
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int ret;
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int result;
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int done = 0;
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unsigned long offset;
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// prepare the key to look for the 'block'-th block of file
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make_cpu_key(&key, inode,
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(loff_t) block * inode->i_sb->s_blocksize + 1, TYPE_ANY,
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3);
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research:
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result = search_for_position_by_key(inode->i_sb, &key, &path);
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if (result != POSITION_FOUND) {
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pathrelse(&path);
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if (p)
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kunmap(bh_result->b_page);
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if (result == IO_ERROR)
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return -EIO;
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// We do not return -ENOENT if there is a hole but page is uptodate, because it means
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// That there is some MMAPED data associated with it that is yet to be written to disk.
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if ((args & GET_BLOCK_NO_HOLE)
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&& !PageUptodate(bh_result->b_page)) {
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return -ENOENT;
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}
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return 0;
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}
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//
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bh = get_last_bh(&path);
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ih = get_ih(&path);
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if (is_indirect_le_ih(ih)) {
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__le32 *ind_item = (__le32 *) B_I_PITEM(bh, ih);
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/* FIXME: here we could cache indirect item or part of it in
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the inode to avoid search_by_key in case of subsequent
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access to file */
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blocknr = get_block_num(ind_item, path.pos_in_item);
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ret = 0;
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if (blocknr) {
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map_bh(bh_result, inode->i_sb, blocknr);
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if (path.pos_in_item ==
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((ih_item_len(ih) / UNFM_P_SIZE) - 1)) {
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set_buffer_boundary(bh_result);
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}
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} else
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// We do not return -ENOENT if there is a hole but page is uptodate, because it means
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// That there is some MMAPED data associated with it that is yet to be written to disk.
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if ((args & GET_BLOCK_NO_HOLE)
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&& !PageUptodate(bh_result->b_page)) {
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ret = -ENOENT;
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}
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pathrelse(&path);
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if (p)
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kunmap(bh_result->b_page);
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return ret;
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}
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// requested data are in direct item(s)
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if (!(args & GET_BLOCK_READ_DIRECT)) {
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// we are called by bmap. FIXME: we can not map block of file
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// when it is stored in direct item(s)
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pathrelse(&path);
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if (p)
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kunmap(bh_result->b_page);
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return -ENOENT;
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}
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/* if we've got a direct item, and the buffer or page was uptodate,
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** we don't want to pull data off disk again. skip to the
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** end, where we map the buffer and return
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*/
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if (buffer_uptodate(bh_result)) {
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goto finished;
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} else
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/*
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** grab_tail_page can trigger calls to reiserfs_get_block on up to date
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** pages without any buffers. If the page is up to date, we don't want
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** read old data off disk. Set the up to date bit on the buffer instead
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** and jump to the end
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*/
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if (!bh_result->b_page || PageUptodate(bh_result->b_page)) {
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set_buffer_uptodate(bh_result);
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goto finished;
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}
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// read file tail into part of page
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offset = (cpu_key_k_offset(&key) - 1) & (PAGE_CACHE_SIZE - 1);
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fs_gen = get_generation(inode->i_sb);
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copy_item_head(&tmp_ih, ih);
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/* we only want to kmap if we are reading the tail into the page.
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** this is not the common case, so we don't kmap until we are
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** sure we need to. But, this means the item might move if
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** kmap schedules
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*/
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if (!p) {
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p = (char *)kmap(bh_result->b_page);
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if (fs_changed(fs_gen, inode->i_sb)
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&& item_moved(&tmp_ih, &path)) {
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goto research;
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}
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}
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p += offset;
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memset(p, 0, inode->i_sb->s_blocksize);
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do {
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if (!is_direct_le_ih(ih)) {
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BUG();
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}
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/* make sure we don't read more bytes than actually exist in
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** the file. This can happen in odd cases where i_size isn't
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** correct, and when direct item padding results in a few
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** extra bytes at the end of the direct item
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*/
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if ((le_ih_k_offset(ih) + path.pos_in_item) > inode->i_size)
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break;
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if ((le_ih_k_offset(ih) - 1 + ih_item_len(ih)) > inode->i_size) {
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chars =
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inode->i_size - (le_ih_k_offset(ih) - 1) -
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path.pos_in_item;
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done = 1;
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} else {
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chars = ih_item_len(ih) - path.pos_in_item;
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}
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memcpy(p, B_I_PITEM(bh, ih) + path.pos_in_item, chars);
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if (done)
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break;
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p += chars;
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if (PATH_LAST_POSITION(&path) != (B_NR_ITEMS(bh) - 1))
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// we done, if read direct item is not the last item of
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// node FIXME: we could try to check right delimiting key
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// to see whether direct item continues in the right
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// neighbor or rely on i_size
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break;
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// update key to look for the next piece
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set_cpu_key_k_offset(&key, cpu_key_k_offset(&key) + chars);
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result = search_for_position_by_key(inode->i_sb, &key, &path);
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if (result != POSITION_FOUND)
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// i/o error most likely
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break;
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bh = get_last_bh(&path);
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ih = get_ih(&path);
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} while (1);
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flush_dcache_page(bh_result->b_page);
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kunmap(bh_result->b_page);
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finished:
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pathrelse(&path);
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if (result == IO_ERROR)
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return -EIO;
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/* this buffer has valid data, but isn't valid for io. mapping it to
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* block #0 tells the rest of reiserfs it just has a tail in it
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*/
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map_bh(bh_result, inode->i_sb, 0);
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set_buffer_uptodate(bh_result);
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return 0;
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}
|
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|
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// this is called to create file map. So, _get_block_create_0 will not
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// read direct item
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static int reiserfs_bmap(struct inode *inode, sector_t block,
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struct buffer_head *bh_result, int create)
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{
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if (!file_capable(inode, block))
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return -EFBIG;
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|
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reiserfs_write_lock(inode->i_sb);
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/* do not read the direct item */
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_get_block_create_0(inode, block, bh_result, 0);
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reiserfs_write_unlock(inode->i_sb);
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return 0;
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}
|
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|
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/* special version of get_block that is only used by grab_tail_page right
|
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** now. It is sent to block_prepare_write, and when you try to get a
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** block past the end of the file (or a block from a hole) it returns
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** -ENOENT instead of a valid buffer. block_prepare_write expects to
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** be able to do i/o on the buffers returned, unless an error value
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** is also returned.
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**
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** So, this allows block_prepare_write to be used for reading a single block
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** in a page. Where it does not produce a valid page for holes, or past the
|
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** end of the file. This turns out to be exactly what we need for reading
|
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** tails for conversion.
|
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**
|
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** The point of the wrapper is forcing a certain value for create, even
|
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** though the VFS layer is calling this function with create==1. If you
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** don't want to send create == GET_BLOCK_NO_HOLE to reiserfs_get_block,
|
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** don't use this function.
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*/
|
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static int reiserfs_get_block_create_0(struct inode *inode, sector_t block,
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struct buffer_head *bh_result,
|
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int create)
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{
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return reiserfs_get_block(inode, block, bh_result, GET_BLOCK_NO_HOLE);
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}
|
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|
|
/* This is special helper for reiserfs_get_block in case we are executing
|
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direct_IO request. */
|
|
static int reiserfs_get_blocks_direct_io(struct inode *inode,
|
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sector_t iblock,
|
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struct buffer_head *bh_result,
|
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int create)
|
|
{
|
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int ret;
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|
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bh_result->b_page = NULL;
|
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|
|
/* We set the b_size before reiserfs_get_block call since it is
|
|
referenced in convert_tail_for_hole() that may be called from
|
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reiserfs_get_block() */
|
|
bh_result->b_size = (1 << inode->i_blkbits);
|
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|
|
ret = reiserfs_get_block(inode, iblock, bh_result,
|
|
create | GET_BLOCK_NO_DANGLE);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* don't allow direct io onto tail pages */
|
|
if (buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
|
|
/* make sure future calls to the direct io funcs for this offset
|
|
** in the file fail by unmapping the buffer
|
|
*/
|
|
clear_buffer_mapped(bh_result);
|
|
ret = -EINVAL;
|
|
}
|
|
/* Possible unpacked tail. Flush the data before pages have
|
|
disappeared */
|
|
if (REISERFS_I(inode)->i_flags & i_pack_on_close_mask) {
|
|
int err;
|
|
lock_kernel();
|
|
err = reiserfs_commit_for_inode(inode);
|
|
REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
|
|
unlock_kernel();
|
|
if (err < 0)
|
|
ret = err;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
** helper function for when reiserfs_get_block is called for a hole
|
|
** but the file tail is still in a direct item
|
|
** bh_result is the buffer head for the hole
|
|
** tail_offset is the offset of the start of the tail in the file
|
|
**
|
|
** This calls prepare_write, which will start a new transaction
|
|
** you should not be in a transaction, or have any paths held when you
|
|
** call this.
|
|
*/
|
|
static int convert_tail_for_hole(struct inode *inode,
|
|
struct buffer_head *bh_result,
|
|
loff_t tail_offset)
|
|
{
|
|
unsigned long index;
|
|
unsigned long tail_end;
|
|
unsigned long tail_start;
|
|
struct page *tail_page;
|
|
struct page *hole_page = bh_result->b_page;
|
|
int retval = 0;
|
|
|
|
if ((tail_offset & (bh_result->b_size - 1)) != 1)
|
|
return -EIO;
|
|
|
|
/* always try to read until the end of the block */
|
|
tail_start = tail_offset & (PAGE_CACHE_SIZE - 1);
|
|
tail_end = (tail_start | (bh_result->b_size - 1)) + 1;
|
|
|
|
index = tail_offset >> PAGE_CACHE_SHIFT;
|
|
/* hole_page can be zero in case of direct_io, we are sure
|
|
that we cannot get here if we write with O_DIRECT into
|
|
tail page */
|
|
if (!hole_page || index != hole_page->index) {
|
|
tail_page = grab_cache_page(inode->i_mapping, index);
|
|
retval = -ENOMEM;
|
|
if (!tail_page) {
|
|
goto out;
|
|
}
|
|
} else {
|
|
tail_page = hole_page;
|
|
}
|
|
|
|
/* we don't have to make sure the conversion did not happen while
|
|
** we were locking the page because anyone that could convert
|
|
** must first take i_mutex.
|
|
**
|
|
** We must fix the tail page for writing because it might have buffers
|
|
** that are mapped, but have a block number of 0. This indicates tail
|
|
** data that has been read directly into the page, and block_prepare_write
|
|
** won't trigger a get_block in this case.
|
|
*/
|
|
fix_tail_page_for_writing(tail_page);
|
|
retval = reiserfs_prepare_write(NULL, tail_page, tail_start, tail_end);
|
|
if (retval)
|
|
goto unlock;
|
|
|
|
/* tail conversion might change the data in the page */
|
|
flush_dcache_page(tail_page);
|
|
|
|
retval = reiserfs_commit_write(NULL, tail_page, tail_start, tail_end);
|
|
|
|
unlock:
|
|
if (tail_page != hole_page) {
|
|
unlock_page(tail_page);
|
|
page_cache_release(tail_page);
|
|
}
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static inline int _allocate_block(struct reiserfs_transaction_handle *th,
|
|
long block,
|
|
struct inode *inode,
|
|
b_blocknr_t * allocated_block_nr,
|
|
struct path *path, int flags)
|
|
{
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
#ifdef REISERFS_PREALLOCATE
|
|
if (!(flags & GET_BLOCK_NO_IMUX)) {
|
|
return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
|
|
path, block);
|
|
}
|
|
#endif
|
|
return reiserfs_new_unf_blocknrs(th, inode, allocated_block_nr, path,
|
|
block);
|
|
}
|
|
|
|
int reiserfs_get_block(struct inode *inode, sector_t block,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
int repeat, retval = 0;
|
|
b_blocknr_t allocated_block_nr = 0; // b_blocknr_t is (unsigned) 32 bit int
|
|
INITIALIZE_PATH(path);
|
|
int pos_in_item;
|
|
struct cpu_key key;
|
|
struct buffer_head *bh, *unbh = NULL;
|
|
struct item_head *ih, tmp_ih;
|
|
__le32 *item;
|
|
int done;
|
|
int fs_gen;
|
|
struct reiserfs_transaction_handle *th = NULL;
|
|
/* space reserved in transaction batch:
|
|
. 3 balancings in direct->indirect conversion
|
|
. 1 block involved into reiserfs_update_sd()
|
|
XXX in practically impossible worst case direct2indirect()
|
|
can incur (much) more than 3 balancings.
|
|
quota update for user, group */
|
|
int jbegin_count =
|
|
JOURNAL_PER_BALANCE_CNT * 3 + 1 +
|
|
2 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
|
|
int version;
|
|
int dangle = 1;
|
|
loff_t new_offset =
|
|
(((loff_t) block) << inode->i_sb->s_blocksize_bits) + 1;
|
|
|
|
/* bad.... */
|
|
reiserfs_write_lock(inode->i_sb);
|
|
version = get_inode_item_key_version(inode);
|
|
|
|
if (!file_capable(inode, block)) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return -EFBIG;
|
|
}
|
|
|
|
/* if !create, we aren't changing the FS, so we don't need to
|
|
** log anything, so we don't need to start a transaction
|
|
*/
|
|
if (!(create & GET_BLOCK_CREATE)) {
|
|
int ret;
|
|
/* find number of block-th logical block of the file */
|
|
ret = _get_block_create_0(inode, block, bh_result,
|
|
create | GET_BLOCK_READ_DIRECT);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return ret;
|
|
}
|
|
/*
|
|
* if we're already in a transaction, make sure to close
|
|
* any new transactions we start in this func
|
|
*/
|
|
if ((create & GET_BLOCK_NO_DANGLE) ||
|
|
reiserfs_transaction_running(inode->i_sb))
|
|
dangle = 0;
|
|
|
|
/* If file is of such a size, that it might have a tail and tails are enabled
|
|
** we should mark it as possibly needing tail packing on close
|
|
*/
|
|
if ((have_large_tails(inode->i_sb)
|
|
&& inode->i_size < i_block_size(inode) * 4)
|
|
|| (have_small_tails(inode->i_sb)
|
|
&& inode->i_size < i_block_size(inode)))
|
|
REISERFS_I(inode)->i_flags |= i_pack_on_close_mask;
|
|
|
|
/* set the key of the first byte in the 'block'-th block of file */
|
|
make_cpu_key(&key, inode, new_offset, TYPE_ANY, 3 /*key length */ );
|
|
if ((new_offset + inode->i_sb->s_blocksize - 1) > inode->i_size) {
|
|
start_trans:
|
|
th = reiserfs_persistent_transaction(inode->i_sb, jbegin_count);
|
|
if (!th) {
|
|
retval = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
reiserfs_update_inode_transaction(inode);
|
|
}
|
|
research:
|
|
|
|
retval = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (retval == IO_ERROR) {
|
|
retval = -EIO;
|
|
goto failure;
|
|
}
|
|
|
|
bh = get_last_bh(&path);
|
|
ih = get_ih(&path);
|
|
item = get_item(&path);
|
|
pos_in_item = path.pos_in_item;
|
|
|
|
fs_gen = get_generation(inode->i_sb);
|
|
copy_item_head(&tmp_ih, ih);
|
|
|
|
if (allocation_needed
|
|
(retval, allocated_block_nr, ih, item, pos_in_item)) {
|
|
/* we have to allocate block for the unformatted node */
|
|
if (!th) {
|
|
pathrelse(&path);
|
|
goto start_trans;
|
|
}
|
|
|
|
repeat =
|
|
_allocate_block(th, block, inode, &allocated_block_nr,
|
|
&path, create);
|
|
|
|
if (repeat == NO_DISK_SPACE || repeat == QUOTA_EXCEEDED) {
|
|
/* restart the transaction to give the journal a chance to free
|
|
** some blocks. releases the path, so we have to go back to
|
|
** research if we succeed on the second try
|
|
*/
|
|
SB_JOURNAL(inode->i_sb)->j_next_async_flush = 1;
|
|
retval = restart_transaction(th, inode, &path);
|
|
if (retval)
|
|
goto failure;
|
|
repeat =
|
|
_allocate_block(th, block, inode,
|
|
&allocated_block_nr, NULL, create);
|
|
|
|
if (repeat != NO_DISK_SPACE && repeat != QUOTA_EXCEEDED) {
|
|
goto research;
|
|
}
|
|
if (repeat == QUOTA_EXCEEDED)
|
|
retval = -EDQUOT;
|
|
else
|
|
retval = -ENOSPC;
|
|
goto failure;
|
|
}
|
|
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
goto research;
|
|
}
|
|
}
|
|
|
|
if (indirect_item_found(retval, ih)) {
|
|
b_blocknr_t unfm_ptr;
|
|
/* 'block'-th block is in the file already (there is
|
|
corresponding cell in some indirect item). But it may be
|
|
zero unformatted node pointer (hole) */
|
|
unfm_ptr = get_block_num(item, pos_in_item);
|
|
if (unfm_ptr == 0) {
|
|
/* use allocated block to plug the hole */
|
|
reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb,
|
|
bh);
|
|
goto research;
|
|
}
|
|
set_buffer_new(bh_result);
|
|
if (buffer_dirty(bh_result)
|
|
&& reiserfs_data_ordered(inode->i_sb))
|
|
reiserfs_add_ordered_list(inode, bh_result);
|
|
put_block_num(item, pos_in_item, allocated_block_nr);
|
|
unfm_ptr = allocated_block_nr;
|
|
journal_mark_dirty(th, inode->i_sb, bh);
|
|
reiserfs_update_sd(th, inode);
|
|
}
|
|
set_block_dev_mapped(bh_result, unfm_ptr, inode);
|
|
pathrelse(&path);
|
|
retval = 0;
|
|
if (!dangle && th)
|
|
retval = reiserfs_end_persistent_transaction(th);
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
/* the item was found, so new blocks were not added to the file
|
|
** there is no need to make sure the inode is updated with this
|
|
** transaction
|
|
*/
|
|
return retval;
|
|
}
|
|
|
|
if (!th) {
|
|
pathrelse(&path);
|
|
goto start_trans;
|
|
}
|
|
|
|
/* desired position is not found or is in the direct item. We have
|
|
to append file with holes up to 'block'-th block converting
|
|
direct items to indirect one if necessary */
|
|
done = 0;
|
|
do {
|
|
if (is_statdata_le_ih(ih)) {
|
|
__le32 unp = 0;
|
|
struct cpu_key tmp_key;
|
|
|
|
/* indirect item has to be inserted */
|
|
make_le_item_head(&tmp_ih, &key, version, 1,
|
|
TYPE_INDIRECT, UNFM_P_SIZE,
|
|
0 /* free_space */ );
|
|
|
|
if (cpu_key_k_offset(&key) == 1) {
|
|
/* we are going to add 'block'-th block to the file. Use
|
|
allocated block for that */
|
|
unp = cpu_to_le32(allocated_block_nr);
|
|
set_block_dev_mapped(bh_result,
|
|
allocated_block_nr, inode);
|
|
set_buffer_new(bh_result);
|
|
done = 1;
|
|
}
|
|
tmp_key = key; // ;)
|
|
set_cpu_key_k_offset(&tmp_key, 1);
|
|
PATH_LAST_POSITION(&path)++;
|
|
|
|
retval =
|
|
reiserfs_insert_item(th, &path, &tmp_key, &tmp_ih,
|
|
inode, (char *)&unp);
|
|
if (retval) {
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
goto failure; // retval == -ENOSPC, -EDQUOT or -EIO or -EEXIST
|
|
}
|
|
//mark_tail_converted (inode);
|
|
} else if (is_direct_le_ih(ih)) {
|
|
/* direct item has to be converted */
|
|
loff_t tail_offset;
|
|
|
|
tail_offset =
|
|
((le_ih_k_offset(ih) -
|
|
1) & ~(inode->i_sb->s_blocksize - 1)) + 1;
|
|
if (tail_offset == cpu_key_k_offset(&key)) {
|
|
/* direct item we just found fits into block we have
|
|
to map. Convert it into unformatted node: use
|
|
bh_result for the conversion */
|
|
set_block_dev_mapped(bh_result,
|
|
allocated_block_nr, inode);
|
|
unbh = bh_result;
|
|
done = 1;
|
|
} else {
|
|
/* we have to padd file tail stored in direct item(s)
|
|
up to block size and convert it to unformatted
|
|
node. FIXME: this should also get into page cache */
|
|
|
|
pathrelse(&path);
|
|
/*
|
|
* ugly, but we can only end the transaction if
|
|
* we aren't nested
|
|
*/
|
|
BUG_ON(!th->t_refcount);
|
|
if (th->t_refcount == 1) {
|
|
retval =
|
|
reiserfs_end_persistent_transaction
|
|
(th);
|
|
th = NULL;
|
|
if (retval)
|
|
goto failure;
|
|
}
|
|
|
|
retval =
|
|
convert_tail_for_hole(inode, bh_result,
|
|
tail_offset);
|
|
if (retval) {
|
|
if (retval != -ENOSPC)
|
|
reiserfs_warning(inode->i_sb,
|
|
"clm-6004: convert tail failed inode %lu, error %d",
|
|
inode->i_ino,
|
|
retval);
|
|
if (allocated_block_nr) {
|
|
/* the bitmap, the super, and the stat data == 3 */
|
|
if (!th)
|
|
th = reiserfs_persistent_transaction(inode->i_sb, 3);
|
|
if (th)
|
|
reiserfs_free_block(th,
|
|
inode,
|
|
allocated_block_nr,
|
|
1);
|
|
}
|
|
goto failure;
|
|
}
|
|
goto research;
|
|
}
|
|
retval =
|
|
direct2indirect(th, inode, &path, unbh,
|
|
tail_offset);
|
|
if (retval) {
|
|
reiserfs_unmap_buffer(unbh);
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
goto failure;
|
|
}
|
|
/* it is important the set_buffer_uptodate is done after
|
|
** the direct2indirect. The buffer might contain valid
|
|
** data newer than the data on disk (read by readpage, changed,
|
|
** and then sent here by writepage). direct2indirect needs
|
|
** to know if unbh was already up to date, so it can decide
|
|
** if the data in unbh needs to be replaced with data from
|
|
** the disk
|
|
*/
|
|
set_buffer_uptodate(unbh);
|
|
|
|
/* unbh->b_page == NULL in case of DIRECT_IO request, this means
|
|
buffer will disappear shortly, so it should not be added to
|
|
*/
|
|
if (unbh->b_page) {
|
|
/* we've converted the tail, so we must
|
|
** flush unbh before the transaction commits
|
|
*/
|
|
reiserfs_add_tail_list(inode, unbh);
|
|
|
|
/* mark it dirty now to prevent commit_write from adding
|
|
** this buffer to the inode's dirty buffer list
|
|
*/
|
|
/*
|
|
* AKPM: changed __mark_buffer_dirty to mark_buffer_dirty().
|
|
* It's still atomic, but it sets the page dirty too,
|
|
* which makes it eligible for writeback at any time by the
|
|
* VM (which was also the case with __mark_buffer_dirty())
|
|
*/
|
|
mark_buffer_dirty(unbh);
|
|
}
|
|
} else {
|
|
/* append indirect item with holes if needed, when appending
|
|
pointer to 'block'-th block use block, which is already
|
|
allocated */
|
|
struct cpu_key tmp_key;
|
|
unp_t unf_single = 0; // We use this in case we need to allocate only
|
|
// one block which is a fastpath
|
|
unp_t *un;
|
|
__u64 max_to_insert =
|
|
MAX_ITEM_LEN(inode->i_sb->s_blocksize) /
|
|
UNFM_P_SIZE;
|
|
__u64 blocks_needed;
|
|
|
|
RFALSE(pos_in_item != ih_item_len(ih) / UNFM_P_SIZE,
|
|
"vs-804: invalid position for append");
|
|
/* indirect item has to be appended, set up key of that position */
|
|
make_cpu_key(&tmp_key, inode,
|
|
le_key_k_offset(version,
|
|
&(ih->ih_key)) +
|
|
op_bytes_number(ih,
|
|
inode->i_sb->s_blocksize),
|
|
//pos_in_item * inode->i_sb->s_blocksize,
|
|
TYPE_INDIRECT, 3); // key type is unimportant
|
|
|
|
RFALSE(cpu_key_k_offset(&tmp_key) > cpu_key_k_offset(&key),
|
|
"green-805: invalid offset");
|
|
blocks_needed =
|
|
1 +
|
|
((cpu_key_k_offset(&key) -
|
|
cpu_key_k_offset(&tmp_key)) >> inode->i_sb->
|
|
s_blocksize_bits);
|
|
|
|
if (blocks_needed == 1) {
|
|
un = &unf_single;
|
|
} else {
|
|
un = kmalloc(min(blocks_needed, max_to_insert) * UNFM_P_SIZE, GFP_ATOMIC); // We need to avoid scheduling.
|
|
if (!un) {
|
|
un = &unf_single;
|
|
blocks_needed = 1;
|
|
max_to_insert = 0;
|
|
} else
|
|
memset(un, 0,
|
|
UNFM_P_SIZE * min(blocks_needed,
|
|
max_to_insert));
|
|
}
|
|
if (blocks_needed <= max_to_insert) {
|
|
/* we are going to add target block to the file. Use allocated
|
|
block for that */
|
|
un[blocks_needed - 1] =
|
|
cpu_to_le32(allocated_block_nr);
|
|
set_block_dev_mapped(bh_result,
|
|
allocated_block_nr, inode);
|
|
set_buffer_new(bh_result);
|
|
done = 1;
|
|
} else {
|
|
/* paste hole to the indirect item */
|
|
/* If kmalloc failed, max_to_insert becomes zero and it means we
|
|
only have space for one block */
|
|
blocks_needed =
|
|
max_to_insert ? max_to_insert : 1;
|
|
}
|
|
retval =
|
|
reiserfs_paste_into_item(th, &path, &tmp_key, inode,
|
|
(char *)un,
|
|
UNFM_P_SIZE *
|
|
blocks_needed);
|
|
|
|
if (blocks_needed != 1)
|
|
kfree(un);
|
|
|
|
if (retval) {
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
goto failure;
|
|
}
|
|
if (!done) {
|
|
/* We need to mark new file size in case this function will be
|
|
interrupted/aborted later on. And we may do this only for
|
|
holes. */
|
|
inode->i_size +=
|
|
inode->i_sb->s_blocksize * blocks_needed;
|
|
}
|
|
}
|
|
|
|
if (done == 1)
|
|
break;
|
|
|
|
/* this loop could log more blocks than we had originally asked
|
|
** for. So, we have to allow the transaction to end if it is
|
|
** too big or too full. Update the inode so things are
|
|
** consistent if we crash before the function returns
|
|
**
|
|
** release the path so that anybody waiting on the path before
|
|
** ending their transaction will be able to continue.
|
|
*/
|
|
if (journal_transaction_should_end(th, th->t_blocks_allocated)) {
|
|
retval = restart_transaction(th, inode, &path);
|
|
if (retval)
|
|
goto failure;
|
|
}
|
|
/* inserting indirect pointers for a hole can take a
|
|
** long time. reschedule if needed
|
|
*/
|
|
cond_resched();
|
|
|
|
retval = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (retval == IO_ERROR) {
|
|
retval = -EIO;
|
|
goto failure;
|
|
}
|
|
if (retval == POSITION_FOUND) {
|
|
reiserfs_warning(inode->i_sb,
|
|
"vs-825: reiserfs_get_block: "
|
|
"%K should not be found", &key);
|
|
retval = -EEXIST;
|
|
if (allocated_block_nr)
|
|
reiserfs_free_block(th, inode,
|
|
allocated_block_nr, 1);
|
|
pathrelse(&path);
|
|
goto failure;
|
|
}
|
|
bh = get_last_bh(&path);
|
|
ih = get_ih(&path);
|
|
item = get_item(&path);
|
|
pos_in_item = path.pos_in_item;
|
|
} while (1);
|
|
|
|
retval = 0;
|
|
|
|
failure:
|
|
if (th && (!dangle || (retval && !th->t_trans_id))) {
|
|
int err;
|
|
if (th->t_trans_id)
|
|
reiserfs_update_sd(th, inode);
|
|
err = reiserfs_end_persistent_transaction(th);
|
|
if (err)
|
|
retval = err;
|
|
}
|
|
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
reiserfs_check_path(&path);
|
|
return retval;
|
|
}
|
|
|
|
static int
|
|
reiserfs_readpages(struct file *file, struct address_space *mapping,
|
|
struct list_head *pages, unsigned nr_pages)
|
|
{
|
|
return mpage_readpages(mapping, pages, nr_pages, reiserfs_get_block);
|
|
}
|
|
|
|
/* Compute real number of used bytes by file
|
|
* Following three functions can go away when we'll have enough space in stat item
|
|
*/
|
|
static int real_space_diff(struct inode *inode, int sd_size)
|
|
{
|
|
int bytes;
|
|
loff_t blocksize = inode->i_sb->s_blocksize;
|
|
|
|
if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode))
|
|
return sd_size;
|
|
|
|
/* End of file is also in full block with indirect reference, so round
|
|
** up to the next block.
|
|
**
|
|
** there is just no way to know if the tail is actually packed
|
|
** on the file, so we have to assume it isn't. When we pack the
|
|
** tail, we add 4 bytes to pretend there really is an unformatted
|
|
** node pointer
|
|
*/
|
|
bytes =
|
|
((inode->i_size +
|
|
(blocksize - 1)) >> inode->i_sb->s_blocksize_bits) * UNFM_P_SIZE +
|
|
sd_size;
|
|
return bytes;
|
|
}
|
|
|
|
static inline loff_t to_real_used_space(struct inode *inode, ulong blocks,
|
|
int sd_size)
|
|
{
|
|
if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
|
|
return inode->i_size +
|
|
(loff_t) (real_space_diff(inode, sd_size));
|
|
}
|
|
return ((loff_t) real_space_diff(inode, sd_size)) +
|
|
(((loff_t) blocks) << 9);
|
|
}
|
|
|
|
/* Compute number of blocks used by file in ReiserFS counting */
|
|
static inline ulong to_fake_used_blocks(struct inode *inode, int sd_size)
|
|
{
|
|
loff_t bytes = inode_get_bytes(inode);
|
|
loff_t real_space = real_space_diff(inode, sd_size);
|
|
|
|
/* keeps fsck and non-quota versions of reiserfs happy */
|
|
if (S_ISLNK(inode->i_mode) || S_ISDIR(inode->i_mode)) {
|
|
bytes += (loff_t) 511;
|
|
}
|
|
|
|
/* files from before the quota patch might i_blocks such that
|
|
** bytes < real_space. Deal with that here to prevent it from
|
|
** going negative.
|
|
*/
|
|
if (bytes < real_space)
|
|
return 0;
|
|
return (bytes - real_space) >> 9;
|
|
}
|
|
|
|
//
|
|
// BAD: new directories have stat data of new type and all other items
|
|
// of old type. Version stored in the inode says about body items, so
|
|
// in update_stat_data we can not rely on inode, but have to check
|
|
// item version directly
|
|
//
|
|
|
|
// called by read_locked_inode
|
|
static void init_inode(struct inode *inode, struct path *path)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct item_head *ih;
|
|
__u32 rdev;
|
|
//int version = ITEM_VERSION_1;
|
|
|
|
bh = PATH_PLAST_BUFFER(path);
|
|
ih = PATH_PITEM_HEAD(path);
|
|
|
|
copy_key(INODE_PKEY(inode), &(ih->ih_key));
|
|
inode->i_blksize = reiserfs_default_io_size;
|
|
|
|
INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
|
|
REISERFS_I(inode)->i_flags = 0;
|
|
REISERFS_I(inode)->i_prealloc_block = 0;
|
|
REISERFS_I(inode)->i_prealloc_count = 0;
|
|
REISERFS_I(inode)->i_trans_id = 0;
|
|
REISERFS_I(inode)->i_jl = NULL;
|
|
REISERFS_I(inode)->i_acl_access = NULL;
|
|
REISERFS_I(inode)->i_acl_default = NULL;
|
|
init_rwsem(&REISERFS_I(inode)->xattr_sem);
|
|
|
|
if (stat_data_v1(ih)) {
|
|
struct stat_data_v1 *sd =
|
|
(struct stat_data_v1 *)B_I_PITEM(bh, ih);
|
|
unsigned long blocks;
|
|
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_5);
|
|
set_inode_sd_version(inode, STAT_DATA_V1);
|
|
inode->i_mode = sd_v1_mode(sd);
|
|
inode->i_nlink = sd_v1_nlink(sd);
|
|
inode->i_uid = sd_v1_uid(sd);
|
|
inode->i_gid = sd_v1_gid(sd);
|
|
inode->i_size = sd_v1_size(sd);
|
|
inode->i_atime.tv_sec = sd_v1_atime(sd);
|
|
inode->i_mtime.tv_sec = sd_v1_mtime(sd);
|
|
inode->i_ctime.tv_sec = sd_v1_ctime(sd);
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_mtime.tv_nsec = 0;
|
|
|
|
inode->i_blocks = sd_v1_blocks(sd);
|
|
inode->i_generation = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
blocks = (inode->i_size + 511) >> 9;
|
|
blocks = _ROUND_UP(blocks, inode->i_sb->s_blocksize >> 9);
|
|
if (inode->i_blocks > blocks) {
|
|
// there was a bug in <=3.5.23 when i_blocks could take negative
|
|
// values. Starting from 3.5.17 this value could even be stored in
|
|
// stat data. For such files we set i_blocks based on file
|
|
// size. Just 2 notes: this can be wrong for sparce files. On-disk value will be
|
|
// only updated if file's inode will ever change
|
|
inode->i_blocks = blocks;
|
|
}
|
|
|
|
rdev = sd_v1_rdev(sd);
|
|
REISERFS_I(inode)->i_first_direct_byte =
|
|
sd_v1_first_direct_byte(sd);
|
|
/* an early bug in the quota code can give us an odd number for the
|
|
** block count. This is incorrect, fix it here.
|
|
*/
|
|
if (inode->i_blocks & 1) {
|
|
inode->i_blocks++;
|
|
}
|
|
inode_set_bytes(inode,
|
|
to_real_used_space(inode, inode->i_blocks,
|
|
SD_V1_SIZE));
|
|
/* nopack is initially zero for v1 objects. For v2 objects,
|
|
nopack is initialised from sd_attrs */
|
|
REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
|
|
} else {
|
|
// new stat data found, but object may have old items
|
|
// (directories and symlinks)
|
|
struct stat_data *sd = (struct stat_data *)B_I_PITEM(bh, ih);
|
|
|
|
inode->i_mode = sd_v2_mode(sd);
|
|
inode->i_nlink = sd_v2_nlink(sd);
|
|
inode->i_uid = sd_v2_uid(sd);
|
|
inode->i_size = sd_v2_size(sd);
|
|
inode->i_gid = sd_v2_gid(sd);
|
|
inode->i_mtime.tv_sec = sd_v2_mtime(sd);
|
|
inode->i_atime.tv_sec = sd_v2_atime(sd);
|
|
inode->i_ctime.tv_sec = sd_v2_ctime(sd);
|
|
inode->i_ctime.tv_nsec = 0;
|
|
inode->i_mtime.tv_nsec = 0;
|
|
inode->i_atime.tv_nsec = 0;
|
|
inode->i_blocks = sd_v2_blocks(sd);
|
|
rdev = sd_v2_rdev(sd);
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
inode->i_generation =
|
|
le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
else
|
|
inode->i_generation = sd_v2_generation(sd);
|
|
|
|
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_5);
|
|
else
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_6);
|
|
REISERFS_I(inode)->i_first_direct_byte = 0;
|
|
set_inode_sd_version(inode, STAT_DATA_V2);
|
|
inode_set_bytes(inode,
|
|
to_real_used_space(inode, inode->i_blocks,
|
|
SD_V2_SIZE));
|
|
/* read persistent inode attributes from sd and initalise
|
|
generic inode flags from them */
|
|
REISERFS_I(inode)->i_attrs = sd_v2_attrs(sd);
|
|
sd_attrs_to_i_attrs(sd_v2_attrs(sd), inode);
|
|
}
|
|
|
|
pathrelse(path);
|
|
if (S_ISREG(inode->i_mode)) {
|
|
inode->i_op = &reiserfs_file_inode_operations;
|
|
inode->i_fop = &reiserfs_file_operations;
|
|
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
|
|
} else if (S_ISDIR(inode->i_mode)) {
|
|
inode->i_op = &reiserfs_dir_inode_operations;
|
|
inode->i_fop = &reiserfs_dir_operations;
|
|
} else if (S_ISLNK(inode->i_mode)) {
|
|
inode->i_op = &reiserfs_symlink_inode_operations;
|
|
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
|
|
} else {
|
|
inode->i_blocks = 0;
|
|
inode->i_op = &reiserfs_special_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, new_decode_dev(rdev));
|
|
}
|
|
}
|
|
|
|
// update new stat data with inode fields
|
|
static void inode2sd(void *sd, struct inode *inode, loff_t size)
|
|
{
|
|
struct stat_data *sd_v2 = (struct stat_data *)sd;
|
|
__u16 flags;
|
|
|
|
set_sd_v2_mode(sd_v2, inode->i_mode);
|
|
set_sd_v2_nlink(sd_v2, inode->i_nlink);
|
|
set_sd_v2_uid(sd_v2, inode->i_uid);
|
|
set_sd_v2_size(sd_v2, size);
|
|
set_sd_v2_gid(sd_v2, inode->i_gid);
|
|
set_sd_v2_mtime(sd_v2, inode->i_mtime.tv_sec);
|
|
set_sd_v2_atime(sd_v2, inode->i_atime.tv_sec);
|
|
set_sd_v2_ctime(sd_v2, inode->i_ctime.tv_sec);
|
|
set_sd_v2_blocks(sd_v2, to_fake_used_blocks(inode, SD_V2_SIZE));
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
set_sd_v2_rdev(sd_v2, new_encode_dev(inode->i_rdev));
|
|
else
|
|
set_sd_v2_generation(sd_v2, inode->i_generation);
|
|
flags = REISERFS_I(inode)->i_attrs;
|
|
i_attrs_to_sd_attrs(inode, &flags);
|
|
set_sd_v2_attrs(sd_v2, flags);
|
|
}
|
|
|
|
// used to copy inode's fields to old stat data
|
|
static void inode2sd_v1(void *sd, struct inode *inode, loff_t size)
|
|
{
|
|
struct stat_data_v1 *sd_v1 = (struct stat_data_v1 *)sd;
|
|
|
|
set_sd_v1_mode(sd_v1, inode->i_mode);
|
|
set_sd_v1_uid(sd_v1, inode->i_uid);
|
|
set_sd_v1_gid(sd_v1, inode->i_gid);
|
|
set_sd_v1_nlink(sd_v1, inode->i_nlink);
|
|
set_sd_v1_size(sd_v1, size);
|
|
set_sd_v1_atime(sd_v1, inode->i_atime.tv_sec);
|
|
set_sd_v1_ctime(sd_v1, inode->i_ctime.tv_sec);
|
|
set_sd_v1_mtime(sd_v1, inode->i_mtime.tv_sec);
|
|
|
|
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
|
|
set_sd_v1_rdev(sd_v1, new_encode_dev(inode->i_rdev));
|
|
else
|
|
set_sd_v1_blocks(sd_v1, to_fake_used_blocks(inode, SD_V1_SIZE));
|
|
|
|
// Sigh. i_first_direct_byte is back
|
|
set_sd_v1_first_direct_byte(sd_v1,
|
|
REISERFS_I(inode)->i_first_direct_byte);
|
|
}
|
|
|
|
/* NOTE, you must prepare the buffer head before sending it here,
|
|
** and then log it after the call
|
|
*/
|
|
static void update_stat_data(struct path *path, struct inode *inode,
|
|
loff_t size)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct item_head *ih;
|
|
|
|
bh = PATH_PLAST_BUFFER(path);
|
|
ih = PATH_PITEM_HEAD(path);
|
|
|
|
if (!is_statdata_le_ih(ih))
|
|
reiserfs_panic(inode->i_sb,
|
|
"vs-13065: update_stat_data: key %k, found item %h",
|
|
INODE_PKEY(inode), ih);
|
|
|
|
if (stat_data_v1(ih)) {
|
|
// path points to old stat data
|
|
inode2sd_v1(B_I_PITEM(bh, ih), inode, size);
|
|
} else {
|
|
inode2sd(B_I_PITEM(bh, ih), inode, size);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
void reiserfs_update_sd_size(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode, loff_t size)
|
|
{
|
|
struct cpu_key key;
|
|
INITIALIZE_PATH(path);
|
|
struct buffer_head *bh;
|
|
int fs_gen;
|
|
struct item_head *ih, tmp_ih;
|
|
int retval;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
make_cpu_key(&key, inode, SD_OFFSET, TYPE_STAT_DATA, 3); //key type is unimportant
|
|
|
|
for (;;) {
|
|
int pos;
|
|
/* look for the object's stat data */
|
|
retval = search_item(inode->i_sb, &key, &path);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_warning(inode->i_sb,
|
|
"vs-13050: reiserfs_update_sd: "
|
|
"i/o failure occurred trying to update %K stat data",
|
|
&key);
|
|
return;
|
|
}
|
|
if (retval == ITEM_NOT_FOUND) {
|
|
pos = PATH_LAST_POSITION(&path);
|
|
pathrelse(&path);
|
|
if (inode->i_nlink == 0) {
|
|
/*reiserfs_warning (inode->i_sb, "vs-13050: reiserfs_update_sd: i_nlink == 0, stat data not found"); */
|
|
return;
|
|
}
|
|
reiserfs_warning(inode->i_sb,
|
|
"vs-13060: reiserfs_update_sd: "
|
|
"stat data of object %k (nlink == %d) not found (pos %d)",
|
|
INODE_PKEY(inode), inode->i_nlink,
|
|
pos);
|
|
reiserfs_check_path(&path);
|
|
return;
|
|
}
|
|
|
|
/* sigh, prepare_for_journal might schedule. When it schedules the
|
|
** FS might change. We have to detect that, and loop back to the
|
|
** search if the stat data item has moved
|
|
*/
|
|
bh = get_last_bh(&path);
|
|
ih = get_ih(&path);
|
|
copy_item_head(&tmp_ih, ih);
|
|
fs_gen = get_generation(inode->i_sb);
|
|
reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb, bh);
|
|
continue; /* Stat_data item has been moved after scheduling. */
|
|
}
|
|
break;
|
|
}
|
|
update_stat_data(&path, inode, size);
|
|
journal_mark_dirty(th, th->t_super, bh);
|
|
pathrelse(&path);
|
|
return;
|
|
}
|
|
|
|
/* reiserfs_read_locked_inode is called to read the inode off disk, and it
|
|
** does a make_bad_inode when things go wrong. But, we need to make sure
|
|
** and clear the key in the private portion of the inode, otherwise a
|
|
** corresponding iput might try to delete whatever object the inode last
|
|
** represented.
|
|
*/
|
|
static void reiserfs_make_bad_inode(struct inode *inode)
|
|
{
|
|
memset(INODE_PKEY(inode), 0, KEY_SIZE);
|
|
make_bad_inode(inode);
|
|
}
|
|
|
|
//
|
|
// initially this function was derived from minix or ext2's analog and
|
|
// evolved as the prototype did
|
|
//
|
|
|
|
int reiserfs_init_locked_inode(struct inode *inode, void *p)
|
|
{
|
|
struct reiserfs_iget_args *args = (struct reiserfs_iget_args *)p;
|
|
inode->i_ino = args->objectid;
|
|
INODE_PKEY(inode)->k_dir_id = cpu_to_le32(args->dirid);
|
|
return 0;
|
|
}
|
|
|
|
/* looks for stat data in the tree, and fills up the fields of in-core
|
|
inode stat data fields */
|
|
void reiserfs_read_locked_inode(struct inode *inode,
|
|
struct reiserfs_iget_args *args)
|
|
{
|
|
INITIALIZE_PATH(path_to_sd);
|
|
struct cpu_key key;
|
|
unsigned long dirino;
|
|
int retval;
|
|
|
|
dirino = args->dirid;
|
|
|
|
/* set version 1, version 2 could be used too, because stat data
|
|
key is the same in both versions */
|
|
key.version = KEY_FORMAT_3_5;
|
|
key.on_disk_key.k_dir_id = dirino;
|
|
key.on_disk_key.k_objectid = inode->i_ino;
|
|
key.on_disk_key.k_offset = 0;
|
|
key.on_disk_key.k_type = 0;
|
|
|
|
/* look for the object's stat data */
|
|
retval = search_item(inode->i_sb, &key, &path_to_sd);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_warning(inode->i_sb,
|
|
"vs-13070: reiserfs_read_locked_inode: "
|
|
"i/o failure occurred trying to find stat data of %K",
|
|
&key);
|
|
reiserfs_make_bad_inode(inode);
|
|
return;
|
|
}
|
|
if (retval != ITEM_FOUND) {
|
|
/* a stale NFS handle can trigger this without it being an error */
|
|
pathrelse(&path_to_sd);
|
|
reiserfs_make_bad_inode(inode);
|
|
inode->i_nlink = 0;
|
|
return;
|
|
}
|
|
|
|
init_inode(inode, &path_to_sd);
|
|
|
|
/* It is possible that knfsd is trying to access inode of a file
|
|
that is being removed from the disk by some other thread. As we
|
|
update sd on unlink all that is required is to check for nlink
|
|
here. This bug was first found by Sizif when debugging
|
|
SquidNG/Butterfly, forgotten, and found again after Philippe
|
|
Gramoulle <philippe.gramoulle@mmania.com> reproduced it.
|
|
|
|
More logical fix would require changes in fs/inode.c:iput() to
|
|
remove inode from hash-table _after_ fs cleaned disk stuff up and
|
|
in iget() to return NULL if I_FREEING inode is found in
|
|
hash-table. */
|
|
/* Currently there is one place where it's ok to meet inode with
|
|
nlink==0: processing of open-unlinked and half-truncated files
|
|
during mount (fs/reiserfs/super.c:finish_unfinished()). */
|
|
if ((inode->i_nlink == 0) &&
|
|
!REISERFS_SB(inode->i_sb)->s_is_unlinked_ok) {
|
|
reiserfs_warning(inode->i_sb,
|
|
"vs-13075: reiserfs_read_locked_inode: "
|
|
"dead inode read from disk %K. "
|
|
"This is likely to be race with knfsd. Ignore",
|
|
&key);
|
|
reiserfs_make_bad_inode(inode);
|
|
}
|
|
|
|
reiserfs_check_path(&path_to_sd); /* init inode should be relsing */
|
|
|
|
}
|
|
|
|
/**
|
|
* reiserfs_find_actor() - "find actor" reiserfs supplies to iget5_locked().
|
|
*
|
|
* @inode: inode from hash table to check
|
|
* @opaque: "cookie" passed to iget5_locked(). This is &reiserfs_iget_args.
|
|
*
|
|
* This function is called by iget5_locked() to distinguish reiserfs inodes
|
|
* having the same inode numbers. Such inodes can only exist due to some
|
|
* error condition. One of them should be bad. Inodes with identical
|
|
* inode numbers (objectids) are distinguished by parent directory ids.
|
|
*
|
|
*/
|
|
int reiserfs_find_actor(struct inode *inode, void *opaque)
|
|
{
|
|
struct reiserfs_iget_args *args;
|
|
|
|
args = opaque;
|
|
/* args is already in CPU order */
|
|
return (inode->i_ino == args->objectid) &&
|
|
(le32_to_cpu(INODE_PKEY(inode)->k_dir_id) == args->dirid);
|
|
}
|
|
|
|
struct inode *reiserfs_iget(struct super_block *s, const struct cpu_key *key)
|
|
{
|
|
struct inode *inode;
|
|
struct reiserfs_iget_args args;
|
|
|
|
args.objectid = key->on_disk_key.k_objectid;
|
|
args.dirid = key->on_disk_key.k_dir_id;
|
|
inode = iget5_locked(s, key->on_disk_key.k_objectid,
|
|
reiserfs_find_actor, reiserfs_init_locked_inode,
|
|
(void *)(&args));
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
reiserfs_read_locked_inode(inode, &args);
|
|
unlock_new_inode(inode);
|
|
}
|
|
|
|
if (comp_short_keys(INODE_PKEY(inode), key) || is_bad_inode(inode)) {
|
|
/* either due to i/o error or a stale NFS handle */
|
|
iput(inode);
|
|
inode = NULL;
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
struct dentry *reiserfs_get_dentry(struct super_block *sb, void *vobjp)
|
|
{
|
|
__u32 *data = vobjp;
|
|
struct cpu_key key;
|
|
struct dentry *result;
|
|
struct inode *inode;
|
|
|
|
key.on_disk_key.k_objectid = data[0];
|
|
key.on_disk_key.k_dir_id = data[1];
|
|
reiserfs_write_lock(sb);
|
|
inode = reiserfs_iget(sb, &key);
|
|
if (inode && !IS_ERR(inode) && data[2] != 0 &&
|
|
data[2] != inode->i_generation) {
|
|
iput(inode);
|
|
inode = NULL;
|
|
}
|
|
reiserfs_write_unlock(sb);
|
|
if (!inode)
|
|
inode = ERR_PTR(-ESTALE);
|
|
if (IS_ERR(inode))
|
|
return ERR_PTR(PTR_ERR(inode));
|
|
result = d_alloc_anon(inode);
|
|
if (!result) {
|
|
iput(inode);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
struct dentry *reiserfs_decode_fh(struct super_block *sb, __u32 * data,
|
|
int len, int fhtype,
|
|
int (*acceptable) (void *contect,
|
|
struct dentry * de),
|
|
void *context)
|
|
{
|
|
__u32 obj[3], parent[3];
|
|
|
|
/* fhtype happens to reflect the number of u32s encoded.
|
|
* due to a bug in earlier code, fhtype might indicate there
|
|
* are more u32s then actually fitted.
|
|
* so if fhtype seems to be more than len, reduce fhtype.
|
|
* Valid types are:
|
|
* 2 - objectid + dir_id - legacy support
|
|
* 3 - objectid + dir_id + generation
|
|
* 4 - objectid + dir_id + objectid and dirid of parent - legacy
|
|
* 5 - objectid + dir_id + generation + objectid and dirid of parent
|
|
* 6 - as above plus generation of directory
|
|
* 6 does not fit in NFSv2 handles
|
|
*/
|
|
if (fhtype > len) {
|
|
if (fhtype != 6 || len != 5)
|
|
reiserfs_warning(sb,
|
|
"nfsd/reiserfs, fhtype=%d, len=%d - odd",
|
|
fhtype, len);
|
|
fhtype = 5;
|
|
}
|
|
|
|
obj[0] = data[0];
|
|
obj[1] = data[1];
|
|
if (fhtype == 3 || fhtype >= 5)
|
|
obj[2] = data[2];
|
|
else
|
|
obj[2] = 0; /* generation number */
|
|
|
|
if (fhtype >= 4) {
|
|
parent[0] = data[fhtype >= 5 ? 3 : 2];
|
|
parent[1] = data[fhtype >= 5 ? 4 : 3];
|
|
if (fhtype == 6)
|
|
parent[2] = data[5];
|
|
else
|
|
parent[2] = 0;
|
|
}
|
|
return sb->s_export_op->find_exported_dentry(sb, obj,
|
|
fhtype < 4 ? NULL : parent,
|
|
acceptable, context);
|
|
}
|
|
|
|
int reiserfs_encode_fh(struct dentry *dentry, __u32 * data, int *lenp,
|
|
int need_parent)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int maxlen = *lenp;
|
|
|
|
if (maxlen < 3)
|
|
return 255;
|
|
|
|
data[0] = inode->i_ino;
|
|
data[1] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
data[2] = inode->i_generation;
|
|
*lenp = 3;
|
|
/* no room for directory info? return what we've stored so far */
|
|
if (maxlen < 5 || !need_parent)
|
|
return 3;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
inode = dentry->d_parent->d_inode;
|
|
data[3] = inode->i_ino;
|
|
data[4] = le32_to_cpu(INODE_PKEY(inode)->k_dir_id);
|
|
*lenp = 5;
|
|
if (maxlen >= 6) {
|
|
data[5] = inode->i_generation;
|
|
*lenp = 6;
|
|
}
|
|
spin_unlock(&dentry->d_lock);
|
|
return *lenp;
|
|
}
|
|
|
|
/* looks for stat data, then copies fields to it, marks the buffer
|
|
containing stat data as dirty */
|
|
/* reiserfs inodes are never really dirty, since the dirty inode call
|
|
** always logs them. This call allows the VFS inode marking routines
|
|
** to properly mark inodes for datasync and such, but only actually
|
|
** does something when called for a synchronous update.
|
|
*/
|
|
int reiserfs_write_inode(struct inode *inode, int do_sync)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
int jbegin_count = 1;
|
|
|
|
if (inode->i_sb->s_flags & MS_RDONLY)
|
|
return -EROFS;
|
|
/* memory pressure can sometimes initiate write_inode calls with sync == 1,
|
|
** these cases are just when the system needs ram, not when the
|
|
** inode needs to reach disk for safety, and they can safely be
|
|
** ignored because the altered inode has already been logged.
|
|
*/
|
|
if (do_sync && !(current->flags & PF_MEMALLOC)) {
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (!journal_begin(&th, inode->i_sb, jbegin_count)) {
|
|
reiserfs_update_sd(&th, inode);
|
|
journal_end_sync(&th, inode->i_sb, jbegin_count);
|
|
}
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* stat data of new object is inserted already, this inserts the item
|
|
containing "." and ".." entries */
|
|
static int reiserfs_new_directory(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode,
|
|
struct item_head *ih, struct path *path,
|
|
struct inode *dir)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
char empty_dir[EMPTY_DIR_SIZE];
|
|
char *body = empty_dir;
|
|
struct cpu_key key;
|
|
int retval;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
_make_cpu_key(&key, KEY_FORMAT_3_5, le32_to_cpu(ih->ih_key.k_dir_id),
|
|
le32_to_cpu(ih->ih_key.k_objectid), DOT_OFFSET,
|
|
TYPE_DIRENTRY, 3 /*key length */ );
|
|
|
|
/* compose item head for new item. Directories consist of items of
|
|
old type (ITEM_VERSION_1). Do not set key (second arg is 0), it
|
|
is done by reiserfs_new_inode */
|
|
if (old_format_only(sb)) {
|
|
make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
|
|
TYPE_DIRENTRY, EMPTY_DIR_SIZE_V1, 2);
|
|
|
|
make_empty_dir_item_v1(body, ih->ih_key.k_dir_id,
|
|
ih->ih_key.k_objectid,
|
|
INODE_PKEY(dir)->k_dir_id,
|
|
INODE_PKEY(dir)->k_objectid);
|
|
} else {
|
|
make_le_item_head(ih, NULL, KEY_FORMAT_3_5, DOT_OFFSET,
|
|
TYPE_DIRENTRY, EMPTY_DIR_SIZE, 2);
|
|
|
|
make_empty_dir_item(body, ih->ih_key.k_dir_id,
|
|
ih->ih_key.k_objectid,
|
|
INODE_PKEY(dir)->k_dir_id,
|
|
INODE_PKEY(dir)->k_objectid);
|
|
}
|
|
|
|
/* look for place in the tree for new item */
|
|
retval = search_item(sb, &key, path);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_warning(sb, "vs-13080: reiserfs_new_directory: "
|
|
"i/o failure occurred creating new directory");
|
|
return -EIO;
|
|
}
|
|
if (retval == ITEM_FOUND) {
|
|
pathrelse(path);
|
|
reiserfs_warning(sb, "vs-13070: reiserfs_new_directory: "
|
|
"object with this key exists (%k)",
|
|
&(ih->ih_key));
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* insert item, that is empty directory item */
|
|
return reiserfs_insert_item(th, path, &key, ih, inode, body);
|
|
}
|
|
|
|
/* stat data of object has been inserted, this inserts the item
|
|
containing the body of symlink */
|
|
static int reiserfs_new_symlink(struct reiserfs_transaction_handle *th, struct inode *inode, /* Inode of symlink */
|
|
struct item_head *ih,
|
|
struct path *path, const char *symname,
|
|
int item_len)
|
|
{
|
|
struct super_block *sb = th->t_super;
|
|
struct cpu_key key;
|
|
int retval;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
_make_cpu_key(&key, KEY_FORMAT_3_5,
|
|
le32_to_cpu(ih->ih_key.k_dir_id),
|
|
le32_to_cpu(ih->ih_key.k_objectid),
|
|
1, TYPE_DIRECT, 3 /*key length */ );
|
|
|
|
make_le_item_head(ih, NULL, KEY_FORMAT_3_5, 1, TYPE_DIRECT, item_len,
|
|
0 /*free_space */ );
|
|
|
|
/* look for place in the tree for new item */
|
|
retval = search_item(sb, &key, path);
|
|
if (retval == IO_ERROR) {
|
|
reiserfs_warning(sb, "vs-13080: reiserfs_new_symlinik: "
|
|
"i/o failure occurred creating new symlink");
|
|
return -EIO;
|
|
}
|
|
if (retval == ITEM_FOUND) {
|
|
pathrelse(path);
|
|
reiserfs_warning(sb, "vs-13080: reiserfs_new_symlink: "
|
|
"object with this key exists (%k)",
|
|
&(ih->ih_key));
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* insert item, that is body of symlink */
|
|
return reiserfs_insert_item(th, path, &key, ih, inode, symname);
|
|
}
|
|
|
|
/* inserts the stat data into the tree, and then calls
|
|
reiserfs_new_directory (to insert ".", ".." item if new object is
|
|
directory) or reiserfs_new_symlink (to insert symlink body if new
|
|
object is symlink) or nothing (if new object is regular file)
|
|
|
|
NOTE! uid and gid must already be set in the inode. If we return
|
|
non-zero due to an error, we have to drop the quota previously allocated
|
|
for the fresh inode. This can only be done outside a transaction, so
|
|
if we return non-zero, we also end the transaction. */
|
|
int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
|
|
struct inode *dir, int mode, const char *symname,
|
|
/* 0 for regular, EMTRY_DIR_SIZE for dirs,
|
|
strlen (symname) for symlinks) */
|
|
loff_t i_size, struct dentry *dentry,
|
|
struct inode *inode)
|
|
{
|
|
struct super_block *sb;
|
|
INITIALIZE_PATH(path_to_key);
|
|
struct cpu_key key;
|
|
struct item_head ih;
|
|
struct stat_data sd;
|
|
int retval;
|
|
int err;
|
|
|
|
BUG_ON(!th->t_trans_id);
|
|
|
|
if (DQUOT_ALLOC_INODE(inode)) {
|
|
err = -EDQUOT;
|
|
goto out_end_trans;
|
|
}
|
|
if (!dir || !dir->i_nlink) {
|
|
err = -EPERM;
|
|
goto out_bad_inode;
|
|
}
|
|
|
|
sb = dir->i_sb;
|
|
|
|
/* item head of new item */
|
|
ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
|
|
ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
|
|
if (!ih.ih_key.k_objectid) {
|
|
err = -ENOMEM;
|
|
goto out_bad_inode;
|
|
}
|
|
if (old_format_only(sb))
|
|
/* not a perfect generation count, as object ids can be reused, but
|
|
** this is as good as reiserfs can do right now.
|
|
** note that the private part of inode isn't filled in yet, we have
|
|
** to use the directory.
|
|
*/
|
|
inode->i_generation = le32_to_cpu(INODE_PKEY(dir)->k_objectid);
|
|
else
|
|
#if defined( USE_INODE_GENERATION_COUNTER )
|
|
inode->i_generation =
|
|
le32_to_cpu(REISERFS_SB(sb)->s_rs->s_inode_generation);
|
|
#else
|
|
inode->i_generation = ++event;
|
|
#endif
|
|
|
|
/* fill stat data */
|
|
inode->i_nlink = (S_ISDIR(mode) ? 2 : 1);
|
|
|
|
/* uid and gid must already be set by the caller for quota init */
|
|
|
|
/* symlink cannot be immutable or append only, right? */
|
|
if (S_ISLNK(inode->i_mode))
|
|
inode->i_flags &= ~(S_IMMUTABLE | S_APPEND);
|
|
|
|
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
|
|
inode->i_size = i_size;
|
|
inode->i_blocks = 0;
|
|
inode->i_bytes = 0;
|
|
REISERFS_I(inode)->i_first_direct_byte = S_ISLNK(mode) ? 1 :
|
|
U32_MAX /*NO_BYTES_IN_DIRECT_ITEM */ ;
|
|
|
|
INIT_LIST_HEAD(&(REISERFS_I(inode)->i_prealloc_list));
|
|
REISERFS_I(inode)->i_flags = 0;
|
|
REISERFS_I(inode)->i_prealloc_block = 0;
|
|
REISERFS_I(inode)->i_prealloc_count = 0;
|
|
REISERFS_I(inode)->i_trans_id = 0;
|
|
REISERFS_I(inode)->i_jl = NULL;
|
|
REISERFS_I(inode)->i_attrs =
|
|
REISERFS_I(dir)->i_attrs & REISERFS_INHERIT_MASK;
|
|
sd_attrs_to_i_attrs(REISERFS_I(inode)->i_attrs, inode);
|
|
REISERFS_I(inode)->i_acl_access = NULL;
|
|
REISERFS_I(inode)->i_acl_default = NULL;
|
|
init_rwsem(&REISERFS_I(inode)->xattr_sem);
|
|
|
|
if (old_format_only(sb))
|
|
make_le_item_head(&ih, NULL, KEY_FORMAT_3_5, SD_OFFSET,
|
|
TYPE_STAT_DATA, SD_V1_SIZE, MAX_US_INT);
|
|
else
|
|
make_le_item_head(&ih, NULL, KEY_FORMAT_3_6, SD_OFFSET,
|
|
TYPE_STAT_DATA, SD_SIZE, MAX_US_INT);
|
|
|
|
/* key to search for correct place for new stat data */
|
|
_make_cpu_key(&key, KEY_FORMAT_3_6, le32_to_cpu(ih.ih_key.k_dir_id),
|
|
le32_to_cpu(ih.ih_key.k_objectid), SD_OFFSET,
|
|
TYPE_STAT_DATA, 3 /*key length */ );
|
|
|
|
/* find proper place for inserting of stat data */
|
|
retval = search_item(sb, &key, &path_to_key);
|
|
if (retval == IO_ERROR) {
|
|
err = -EIO;
|
|
goto out_bad_inode;
|
|
}
|
|
if (retval == ITEM_FOUND) {
|
|
pathrelse(&path_to_key);
|
|
err = -EEXIST;
|
|
goto out_bad_inode;
|
|
}
|
|
if (old_format_only(sb)) {
|
|
if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
|
|
pathrelse(&path_to_key);
|
|
/* i_uid or i_gid is too big to be stored in stat data v3.5 */
|
|
err = -EINVAL;
|
|
goto out_bad_inode;
|
|
}
|
|
inode2sd_v1(&sd, inode, inode->i_size);
|
|
} else {
|
|
inode2sd(&sd, inode, inode->i_size);
|
|
}
|
|
// these do not go to on-disk stat data
|
|
inode->i_ino = le32_to_cpu(ih.ih_key.k_objectid);
|
|
inode->i_blksize = reiserfs_default_io_size;
|
|
|
|
// store in in-core inode the key of stat data and version all
|
|
// object items will have (directory items will have old offset
|
|
// format, other new objects will consist of new items)
|
|
memcpy(INODE_PKEY(inode), &(ih.ih_key), KEY_SIZE);
|
|
if (old_format_only(sb) || S_ISDIR(mode) || S_ISLNK(mode))
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_5);
|
|
else
|
|
set_inode_item_key_version(inode, KEY_FORMAT_3_6);
|
|
if (old_format_only(sb))
|
|
set_inode_sd_version(inode, STAT_DATA_V1);
|
|
else
|
|
set_inode_sd_version(inode, STAT_DATA_V2);
|
|
|
|
/* insert the stat data into the tree */
|
|
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
|
|
if (REISERFS_I(dir)->new_packing_locality)
|
|
th->displace_new_blocks = 1;
|
|
#endif
|
|
retval =
|
|
reiserfs_insert_item(th, &path_to_key, &key, &ih, inode,
|
|
(char *)(&sd));
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
goto out_bad_inode;
|
|
}
|
|
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
|
|
if (!th->displace_new_blocks)
|
|
REISERFS_I(dir)->new_packing_locality = 0;
|
|
#endif
|
|
if (S_ISDIR(mode)) {
|
|
/* insert item with "." and ".." */
|
|
retval =
|
|
reiserfs_new_directory(th, inode, &ih, &path_to_key, dir);
|
|
}
|
|
|
|
if (S_ISLNK(mode)) {
|
|
/* insert body of symlink */
|
|
if (!old_format_only(sb))
|
|
i_size = ROUND_UP(i_size);
|
|
retval =
|
|
reiserfs_new_symlink(th, inode, &ih, &path_to_key, symname,
|
|
i_size);
|
|
}
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
journal_end(th, th->t_super, th->t_blocks_allocated);
|
|
goto out_inserted_sd;
|
|
}
|
|
|
|
/* XXX CHECK THIS */
|
|
if (reiserfs_posixacl(inode->i_sb)) {
|
|
retval = reiserfs_inherit_default_acl(dir, dentry, inode);
|
|
if (retval) {
|
|
err = retval;
|
|
reiserfs_check_path(&path_to_key);
|
|
journal_end(th, th->t_super, th->t_blocks_allocated);
|
|
goto out_inserted_sd;
|
|
}
|
|
} else if (inode->i_sb->s_flags & MS_POSIXACL) {
|
|
reiserfs_warning(inode->i_sb, "ACLs aren't enabled in the fs, "
|
|
"but vfs thinks they are!");
|
|
} else if (is_reiserfs_priv_object(dir)) {
|
|
reiserfs_mark_inode_private(inode);
|
|
}
|
|
|
|
insert_inode_hash(inode);
|
|
reiserfs_update_sd(th, inode);
|
|
reiserfs_check_path(&path_to_key);
|
|
|
|
return 0;
|
|
|
|
/* it looks like you can easily compress these two goto targets into
|
|
* one. Keeping it like this doesn't actually hurt anything, and they
|
|
* are place holders for what the quota code actually needs.
|
|
*/
|
|
out_bad_inode:
|
|
/* Invalidate the object, nothing was inserted yet */
|
|
INODE_PKEY(inode)->k_objectid = 0;
|
|
|
|
/* Quota change must be inside a transaction for journaling */
|
|
DQUOT_FREE_INODE(inode);
|
|
|
|
out_end_trans:
|
|
journal_end(th, th->t_super, th->t_blocks_allocated);
|
|
/* Drop can be outside and it needs more credits so it's better to have it outside */
|
|
DQUOT_DROP(inode);
|
|
inode->i_flags |= S_NOQUOTA;
|
|
make_bad_inode(inode);
|
|
|
|
out_inserted_sd:
|
|
inode->i_nlink = 0;
|
|
th->t_trans_id = 0; /* so the caller can't use this handle later */
|
|
|
|
/* If we were inheriting an ACL, we need to release the lock so that
|
|
* iput doesn't deadlock in reiserfs_delete_xattrs. The locking
|
|
* code really needs to be reworked, but this will take care of it
|
|
* for now. -jeffm */
|
|
if (REISERFS_I(dir)->i_acl_default && !IS_ERR(REISERFS_I(dir)->i_acl_default)) {
|
|
reiserfs_write_unlock_xattrs(dir->i_sb);
|
|
iput(inode);
|
|
reiserfs_write_lock_xattrs(dir->i_sb);
|
|
} else
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
** finds the tail page in the page cache,
|
|
** reads the last block in.
|
|
**
|
|
** On success, page_result is set to a locked, pinned page, and bh_result
|
|
** is set to an up to date buffer for the last block in the file. returns 0.
|
|
**
|
|
** tail conversion is not done, so bh_result might not be valid for writing
|
|
** check buffer_mapped(bh_result) and bh_result->b_blocknr != 0 before
|
|
** trying to write the block.
|
|
**
|
|
** on failure, nonzero is returned, page_result and bh_result are untouched.
|
|
*/
|
|
static int grab_tail_page(struct inode *p_s_inode,
|
|
struct page **page_result,
|
|
struct buffer_head **bh_result)
|
|
{
|
|
|
|
/* we want the page with the last byte in the file,
|
|
** not the page that will hold the next byte for appending
|
|
*/
|
|
unsigned long index = (p_s_inode->i_size - 1) >> PAGE_CACHE_SHIFT;
|
|
unsigned long pos = 0;
|
|
unsigned long start = 0;
|
|
unsigned long blocksize = p_s_inode->i_sb->s_blocksize;
|
|
unsigned long offset = (p_s_inode->i_size) & (PAGE_CACHE_SIZE - 1);
|
|
struct buffer_head *bh;
|
|
struct buffer_head *head;
|
|
struct page *page;
|
|
int error;
|
|
|
|
/* we know that we are only called with inode->i_size > 0.
|
|
** we also know that a file tail can never be as big as a block
|
|
** If i_size % blocksize == 0, our file is currently block aligned
|
|
** and it won't need converting or zeroing after a truncate.
|
|
*/
|
|
if ((offset & (blocksize - 1)) == 0) {
|
|
return -ENOENT;
|
|
}
|
|
page = grab_cache_page(p_s_inode->i_mapping, index);
|
|
error = -ENOMEM;
|
|
if (!page) {
|
|
goto out;
|
|
}
|
|
/* start within the page of the last block in the file */
|
|
start = (offset / blocksize) * blocksize;
|
|
|
|
error = block_prepare_write(page, start, offset,
|
|
reiserfs_get_block_create_0);
|
|
if (error)
|
|
goto unlock;
|
|
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
if (pos >= start) {
|
|
break;
|
|
}
|
|
bh = bh->b_this_page;
|
|
pos += blocksize;
|
|
} while (bh != head);
|
|
|
|
if (!buffer_uptodate(bh)) {
|
|
/* note, this should never happen, prepare_write should
|
|
** be taking care of this for us. If the buffer isn't up to date,
|
|
** I've screwed up the code to find the buffer, or the code to
|
|
** call prepare_write
|
|
*/
|
|
reiserfs_warning(p_s_inode->i_sb,
|
|
"clm-6000: error reading block %lu on dev %s",
|
|
bh->b_blocknr,
|
|
reiserfs_bdevname(p_s_inode->i_sb));
|
|
error = -EIO;
|
|
goto unlock;
|
|
}
|
|
*bh_result = bh;
|
|
*page_result = page;
|
|
|
|
out:
|
|
return error;
|
|
|
|
unlock:
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
** vfs version of truncate file. Must NOT be called with
|
|
** a transaction already started.
|
|
**
|
|
** some code taken from block_truncate_page
|
|
*/
|
|
int reiserfs_truncate_file(struct inode *p_s_inode, int update_timestamps)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
/* we want the offset for the first byte after the end of the file */
|
|
unsigned long offset = p_s_inode->i_size & (PAGE_CACHE_SIZE - 1);
|
|
unsigned blocksize = p_s_inode->i_sb->s_blocksize;
|
|
unsigned length;
|
|
struct page *page = NULL;
|
|
int error;
|
|
struct buffer_head *bh = NULL;
|
|
int err2;
|
|
|
|
reiserfs_write_lock(p_s_inode->i_sb);
|
|
|
|
if (p_s_inode->i_size > 0) {
|
|
if ((error = grab_tail_page(p_s_inode, &page, &bh))) {
|
|
// -ENOENT means we truncated past the end of the file,
|
|
// and get_block_create_0 could not find a block to read in,
|
|
// which is ok.
|
|
if (error != -ENOENT)
|
|
reiserfs_warning(p_s_inode->i_sb,
|
|
"clm-6001: grab_tail_page failed %d",
|
|
error);
|
|
page = NULL;
|
|
bh = NULL;
|
|
}
|
|
}
|
|
|
|
/* so, if page != NULL, we have a buffer head for the offset at
|
|
** the end of the file. if the bh is mapped, and bh->b_blocknr != 0,
|
|
** then we have an unformatted node. Otherwise, we have a direct item,
|
|
** and no zeroing is required on disk. We zero after the truncate,
|
|
** because the truncate might pack the item anyway
|
|
** (it will unmap bh if it packs).
|
|
*/
|
|
/* it is enough to reserve space in transaction for 2 balancings:
|
|
one for "save" link adding and another for the first
|
|
cut_from_item. 1 is for update_sd */
|
|
error = journal_begin(&th, p_s_inode->i_sb,
|
|
JOURNAL_PER_BALANCE_CNT * 2 + 1);
|
|
if (error)
|
|
goto out;
|
|
reiserfs_update_inode_transaction(p_s_inode);
|
|
if (update_timestamps)
|
|
/* we are doing real truncate: if the system crashes before the last
|
|
transaction of truncating gets committed - on reboot the file
|
|
either appears truncated properly or not truncated at all */
|
|
add_save_link(&th, p_s_inode, 1);
|
|
err2 = reiserfs_do_truncate(&th, p_s_inode, page, update_timestamps);
|
|
error =
|
|
journal_end(&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1);
|
|
if (error)
|
|
goto out;
|
|
|
|
/* check reiserfs_do_truncate after ending the transaction */
|
|
if (err2) {
|
|
error = err2;
|
|
goto out;
|
|
}
|
|
|
|
if (update_timestamps) {
|
|
error = remove_save_link(p_s_inode, 1 /* truncate */ );
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
if (page) {
|
|
length = offset & (blocksize - 1);
|
|
/* if we are not on a block boundary */
|
|
if (length) {
|
|
char *kaddr;
|
|
|
|
length = blocksize - length;
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
memset(kaddr + offset, 0, length);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
if (buffer_mapped(bh) && bh->b_blocknr != 0) {
|
|
mark_buffer_dirty(bh);
|
|
}
|
|
}
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
}
|
|
|
|
reiserfs_write_unlock(p_s_inode->i_sb);
|
|
return 0;
|
|
out:
|
|
if (page) {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
}
|
|
reiserfs_write_unlock(p_s_inode->i_sb);
|
|
return error;
|
|
}
|
|
|
|
static int map_block_for_writepage(struct inode *inode,
|
|
struct buffer_head *bh_result,
|
|
unsigned long block)
|
|
{
|
|
struct reiserfs_transaction_handle th;
|
|
int fs_gen;
|
|
struct item_head tmp_ih;
|
|
struct item_head *ih;
|
|
struct buffer_head *bh;
|
|
__le32 *item;
|
|
struct cpu_key key;
|
|
INITIALIZE_PATH(path);
|
|
int pos_in_item;
|
|
int jbegin_count = JOURNAL_PER_BALANCE_CNT;
|
|
loff_t byte_offset = ((loff_t)block << inode->i_sb->s_blocksize_bits)+1;
|
|
int retval;
|
|
int use_get_block = 0;
|
|
int bytes_copied = 0;
|
|
int copy_size;
|
|
int trans_running = 0;
|
|
|
|
/* catch places below that try to log something without starting a trans */
|
|
th.t_trans_id = 0;
|
|
|
|
if (!buffer_uptodate(bh_result)) {
|
|
return -EIO;
|
|
}
|
|
|
|
kmap(bh_result->b_page);
|
|
start_over:
|
|
reiserfs_write_lock(inode->i_sb);
|
|
make_cpu_key(&key, inode, byte_offset, TYPE_ANY, 3);
|
|
|
|
research:
|
|
retval = search_for_position_by_key(inode->i_sb, &key, &path);
|
|
if (retval != POSITION_FOUND) {
|
|
use_get_block = 1;
|
|
goto out;
|
|
}
|
|
|
|
bh = get_last_bh(&path);
|
|
ih = get_ih(&path);
|
|
item = get_item(&path);
|
|
pos_in_item = path.pos_in_item;
|
|
|
|
/* we've found an unformatted node */
|
|
if (indirect_item_found(retval, ih)) {
|
|
if (bytes_copied > 0) {
|
|
reiserfs_warning(inode->i_sb,
|
|
"clm-6002: bytes_copied %d",
|
|
bytes_copied);
|
|
}
|
|
if (!get_block_num(item, pos_in_item)) {
|
|
/* crap, we are writing to a hole */
|
|
use_get_block = 1;
|
|
goto out;
|
|
}
|
|
set_block_dev_mapped(bh_result,
|
|
get_block_num(item, pos_in_item), inode);
|
|
} else if (is_direct_le_ih(ih)) {
|
|
char *p;
|
|
p = page_address(bh_result->b_page);
|
|
p += (byte_offset - 1) & (PAGE_CACHE_SIZE - 1);
|
|
copy_size = ih_item_len(ih) - pos_in_item;
|
|
|
|
fs_gen = get_generation(inode->i_sb);
|
|
copy_item_head(&tmp_ih, ih);
|
|
|
|
if (!trans_running) {
|
|
/* vs-3050 is gone, no need to drop the path */
|
|
retval = journal_begin(&th, inode->i_sb, jbegin_count);
|
|
if (retval)
|
|
goto out;
|
|
reiserfs_update_inode_transaction(inode);
|
|
trans_running = 1;
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb,
|
|
bh);
|
|
goto research;
|
|
}
|
|
}
|
|
|
|
reiserfs_prepare_for_journal(inode->i_sb, bh, 1);
|
|
|
|
if (fs_changed(fs_gen, inode->i_sb)
|
|
&& item_moved(&tmp_ih, &path)) {
|
|
reiserfs_restore_prepared_buffer(inode->i_sb, bh);
|
|
goto research;
|
|
}
|
|
|
|
memcpy(B_I_PITEM(bh, ih) + pos_in_item, p + bytes_copied,
|
|
copy_size);
|
|
|
|
journal_mark_dirty(&th, inode->i_sb, bh);
|
|
bytes_copied += copy_size;
|
|
set_block_dev_mapped(bh_result, 0, inode);
|
|
|
|
/* are there still bytes left? */
|
|
if (bytes_copied < bh_result->b_size &&
|
|
(byte_offset + bytes_copied) < inode->i_size) {
|
|
set_cpu_key_k_offset(&key,
|
|
cpu_key_k_offset(&key) +
|
|
copy_size);
|
|
goto research;
|
|
}
|
|
} else {
|
|
reiserfs_warning(inode->i_sb,
|
|
"clm-6003: bad item inode %lu, device %s",
|
|
inode->i_ino, reiserfs_bdevname(inode->i_sb));
|
|
retval = -EIO;
|
|
goto out;
|
|
}
|
|
retval = 0;
|
|
|
|
out:
|
|
pathrelse(&path);
|
|
if (trans_running) {
|
|
int err = journal_end(&th, inode->i_sb, jbegin_count);
|
|
if (err)
|
|
retval = err;
|
|
trans_running = 0;
|
|
}
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
|
|
/* this is where we fill in holes in the file. */
|
|
if (use_get_block) {
|
|
retval = reiserfs_get_block(inode, block, bh_result,
|
|
GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
|
|
| GET_BLOCK_NO_DANGLE);
|
|
if (!retval) {
|
|
if (!buffer_mapped(bh_result)
|
|
|| bh_result->b_blocknr == 0) {
|
|
/* get_block failed to find a mapped unformatted node. */
|
|
use_get_block = 0;
|
|
goto start_over;
|
|
}
|
|
}
|
|
}
|
|
kunmap(bh_result->b_page);
|
|
|
|
if (!retval && buffer_mapped(bh_result) && bh_result->b_blocknr == 0) {
|
|
/* we've copied data from the page into the direct item, so the
|
|
* buffer in the page is now clean, mark it to reflect that.
|
|
*/
|
|
lock_buffer(bh_result);
|
|
clear_buffer_dirty(bh_result);
|
|
unlock_buffer(bh_result);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* mason@suse.com: updated in 2.5.54 to follow the same general io
|
|
* start/recovery path as __block_write_full_page, along with special
|
|
* code to handle reiserfs tails.
|
|
*/
|
|
static int reiserfs_write_full_page(struct page *page,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
unsigned long end_index = inode->i_size >> PAGE_CACHE_SHIFT;
|
|
int error = 0;
|
|
unsigned long block;
|
|
sector_t last_block;
|
|
struct buffer_head *head, *bh;
|
|
int partial = 0;
|
|
int nr = 0;
|
|
int checked = PageChecked(page);
|
|
struct reiserfs_transaction_handle th;
|
|
struct super_block *s = inode->i_sb;
|
|
int bh_per_page = PAGE_CACHE_SIZE / s->s_blocksize;
|
|
th.t_trans_id = 0;
|
|
|
|
/* no logging allowed when nonblocking or from PF_MEMALLOC */
|
|
if (checked && (current->flags & PF_MEMALLOC)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
|
|
/* The page dirty bit is cleared before writepage is called, which
|
|
* means we have to tell create_empty_buffers to make dirty buffers
|
|
* The page really should be up to date at this point, so tossing
|
|
* in the BH_Uptodate is just a sanity check.
|
|
*/
|
|
if (!page_has_buffers(page)) {
|
|
create_empty_buffers(page, s->s_blocksize,
|
|
(1 << BH_Dirty) | (1 << BH_Uptodate));
|
|
}
|
|
head = page_buffers(page);
|
|
|
|
/* last page in the file, zero out any contents past the
|
|
** last byte in the file
|
|
*/
|
|
if (page->index >= end_index) {
|
|
char *kaddr;
|
|
unsigned last_offset;
|
|
|
|
last_offset = inode->i_size & (PAGE_CACHE_SIZE - 1);
|
|
/* no file contents in this page */
|
|
if (page->index >= end_index + 1 || !last_offset) {
|
|
unlock_page(page);
|
|
return 0;
|
|
}
|
|
kaddr = kmap_atomic(page, KM_USER0);
|
|
memset(kaddr + last_offset, 0, PAGE_CACHE_SIZE - last_offset);
|
|
flush_dcache_page(page);
|
|
kunmap_atomic(kaddr, KM_USER0);
|
|
}
|
|
bh = head;
|
|
block = page->index << (PAGE_CACHE_SHIFT - s->s_blocksize_bits);
|
|
last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
|
|
/* first map all the buffers, logging any direct items we find */
|
|
do {
|
|
if (block > last_block) {
|
|
/*
|
|
* This can happen when the block size is less than
|
|
* the page size. The corresponding bytes in the page
|
|
* were zero filled above
|
|
*/
|
|
clear_buffer_dirty(bh);
|
|
set_buffer_uptodate(bh);
|
|
} else if ((checked || buffer_dirty(bh)) &&
|
|
(!buffer_mapped(bh) || (buffer_mapped(bh)
|
|
&& bh->b_blocknr ==
|
|
0))) {
|
|
/* not mapped yet, or it points to a direct item, search
|
|
* the btree for the mapping info, and log any direct
|
|
* items found
|
|
*/
|
|
if ((error = map_block_for_writepage(inode, bh, block))) {
|
|
goto fail;
|
|
}
|
|
}
|
|
bh = bh->b_this_page;
|
|
block++;
|
|
} while (bh != head);
|
|
|
|
/*
|
|
* we start the transaction after map_block_for_writepage,
|
|
* because it can create holes in the file (an unbounded operation).
|
|
* starting it here, we can make a reliable estimate for how many
|
|
* blocks we're going to log
|
|
*/
|
|
if (checked) {
|
|
ClearPageChecked(page);
|
|
reiserfs_write_lock(s);
|
|
error = journal_begin(&th, s, bh_per_page + 1);
|
|
if (error) {
|
|
reiserfs_write_unlock(s);
|
|
goto fail;
|
|
}
|
|
reiserfs_update_inode_transaction(inode);
|
|
}
|
|
/* now go through and lock any dirty buffers on the page */
|
|
do {
|
|
get_bh(bh);
|
|
if (!buffer_mapped(bh))
|
|
continue;
|
|
if (buffer_mapped(bh) && bh->b_blocknr == 0)
|
|
continue;
|
|
|
|
if (checked) {
|
|
reiserfs_prepare_for_journal(s, bh, 1);
|
|
journal_mark_dirty(&th, s, bh);
|
|
continue;
|
|
}
|
|
/* from this point on, we know the buffer is mapped to a
|
|
* real block and not a direct item
|
|
*/
|
|
if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
|
|
lock_buffer(bh);
|
|
} else {
|
|
if (test_set_buffer_locked(bh)) {
|
|
redirty_page_for_writepage(wbc, page);
|
|
continue;
|
|
}
|
|
}
|
|
if (test_clear_buffer_dirty(bh)) {
|
|
mark_buffer_async_write(bh);
|
|
} else {
|
|
unlock_buffer(bh);
|
|
}
|
|
} while ((bh = bh->b_this_page) != head);
|
|
|
|
if (checked) {
|
|
error = journal_end(&th, s, bh_per_page + 1);
|
|
reiserfs_write_unlock(s);
|
|
if (error)
|
|
goto fail;
|
|
}
|
|
BUG_ON(PageWriteback(page));
|
|
set_page_writeback(page);
|
|
unlock_page(page);
|
|
|
|
/*
|
|
* since any buffer might be the only dirty buffer on the page,
|
|
* the first submit_bh can bring the page out of writeback.
|
|
* be careful with the buffers.
|
|
*/
|
|
do {
|
|
struct buffer_head *next = bh->b_this_page;
|
|
if (buffer_async_write(bh)) {
|
|
submit_bh(WRITE, bh);
|
|
nr++;
|
|
}
|
|
put_bh(bh);
|
|
bh = next;
|
|
} while (bh != head);
|
|
|
|
error = 0;
|
|
done:
|
|
if (nr == 0) {
|
|
/*
|
|
* if this page only had a direct item, it is very possible for
|
|
* no io to be required without there being an error. Or,
|
|
* someone else could have locked them and sent them down the
|
|
* pipe without locking the page
|
|
*/
|
|
bh = head;
|
|
do {
|
|
if (!buffer_uptodate(bh)) {
|
|
partial = 1;
|
|
break;
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
if (!partial)
|
|
SetPageUptodate(page);
|
|
end_page_writeback(page);
|
|
}
|
|
return error;
|
|
|
|
fail:
|
|
/* catches various errors, we need to make sure any valid dirty blocks
|
|
* get to the media. The page is currently locked and not marked for
|
|
* writeback
|
|
*/
|
|
ClearPageUptodate(page);
|
|
bh = head;
|
|
do {
|
|
get_bh(bh);
|
|
if (buffer_mapped(bh) && buffer_dirty(bh) && bh->b_blocknr) {
|
|
lock_buffer(bh);
|
|
mark_buffer_async_write(bh);
|
|
} else {
|
|
/*
|
|
* clear any dirty bits that might have come from getting
|
|
* attached to a dirty page
|
|
*/
|
|
clear_buffer_dirty(bh);
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
SetPageError(page);
|
|
BUG_ON(PageWriteback(page));
|
|
set_page_writeback(page);
|
|
unlock_page(page);
|
|
do {
|
|
struct buffer_head *next = bh->b_this_page;
|
|
if (buffer_async_write(bh)) {
|
|
clear_buffer_dirty(bh);
|
|
submit_bh(WRITE, bh);
|
|
nr++;
|
|
}
|
|
put_bh(bh);
|
|
bh = next;
|
|
} while (bh != head);
|
|
goto done;
|
|
}
|
|
|
|
static int reiserfs_readpage(struct file *f, struct page *page)
|
|
{
|
|
return block_read_full_page(page, reiserfs_get_block);
|
|
}
|
|
|
|
static int reiserfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
return reiserfs_write_full_page(page, wbc);
|
|
}
|
|
|
|
static int reiserfs_prepare_write(struct file *f, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
int ret;
|
|
int old_ref = 0;
|
|
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
fix_tail_page_for_writing(page);
|
|
if (reiserfs_transaction_running(inode->i_sb)) {
|
|
struct reiserfs_transaction_handle *th;
|
|
th = (struct reiserfs_transaction_handle *)current->
|
|
journal_info;
|
|
BUG_ON(!th->t_refcount);
|
|
BUG_ON(!th->t_trans_id);
|
|
old_ref = th->t_refcount;
|
|
th->t_refcount++;
|
|
}
|
|
|
|
ret = block_prepare_write(page, from, to, reiserfs_get_block);
|
|
if (ret && reiserfs_transaction_running(inode->i_sb)) {
|
|
struct reiserfs_transaction_handle *th = current->journal_info;
|
|
/* this gets a little ugly. If reiserfs_get_block returned an
|
|
* error and left a transacstion running, we've got to close it,
|
|
* and we've got to free handle if it was a persistent transaction.
|
|
*
|
|
* But, if we had nested into an existing transaction, we need
|
|
* to just drop the ref count on the handle.
|
|
*
|
|
* If old_ref == 0, the transaction is from reiserfs_get_block,
|
|
* and it was a persistent trans. Otherwise, it was nested above.
|
|
*/
|
|
if (th->t_refcount > old_ref) {
|
|
if (old_ref)
|
|
th->t_refcount--;
|
|
else {
|
|
int err;
|
|
reiserfs_write_lock(inode->i_sb);
|
|
err = reiserfs_end_persistent_transaction(th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (err)
|
|
ret = err;
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
|
|
}
|
|
|
|
static sector_t reiserfs_aop_bmap(struct address_space *as, sector_t block)
|
|
{
|
|
return generic_block_bmap(as, block, reiserfs_bmap);
|
|
}
|
|
|
|
static int reiserfs_commit_write(struct file *f, struct page *page,
|
|
unsigned from, unsigned to)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + to;
|
|
int ret = 0;
|
|
int update_sd = 0;
|
|
struct reiserfs_transaction_handle *th = NULL;
|
|
|
|
reiserfs_wait_on_write_block(inode->i_sb);
|
|
if (reiserfs_transaction_running(inode->i_sb)) {
|
|
th = current->journal_info;
|
|
}
|
|
reiserfs_commit_page(inode, page, from, to);
|
|
|
|
/* generic_commit_write does this for us, but does not update the
|
|
** transaction tracking stuff when the size changes. So, we have
|
|
** to do the i_size updates here.
|
|
*/
|
|
if (pos > inode->i_size) {
|
|
struct reiserfs_transaction_handle myth;
|
|
reiserfs_write_lock(inode->i_sb);
|
|
/* If the file have grown beyond the border where it
|
|
can have a tail, unmark it as needing a tail
|
|
packing */
|
|
if ((have_large_tails(inode->i_sb)
|
|
&& inode->i_size > i_block_size(inode) * 4)
|
|
|| (have_small_tails(inode->i_sb)
|
|
&& inode->i_size > i_block_size(inode)))
|
|
REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
|
|
|
|
ret = journal_begin(&myth, inode->i_sb, 1);
|
|
if (ret) {
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
goto journal_error;
|
|
}
|
|
reiserfs_update_inode_transaction(inode);
|
|
inode->i_size = pos;
|
|
/*
|
|
* this will just nest into our transaction. It's important
|
|
* to use mark_inode_dirty so the inode gets pushed around on the
|
|
* dirty lists, and so that O_SYNC works as expected
|
|
*/
|
|
mark_inode_dirty(inode);
|
|
reiserfs_update_sd(&myth, inode);
|
|
update_sd = 1;
|
|
ret = journal_end(&myth, inode->i_sb, 1);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (ret)
|
|
goto journal_error;
|
|
}
|
|
if (th) {
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (!update_sd)
|
|
mark_inode_dirty(inode);
|
|
ret = reiserfs_end_persistent_transaction(th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
|
|
journal_error:
|
|
if (th) {
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (!update_sd)
|
|
reiserfs_update_sd(th, inode);
|
|
ret = reiserfs_end_persistent_transaction(th);
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void sd_attrs_to_i_attrs(__u16 sd_attrs, struct inode *inode)
|
|
{
|
|
if (reiserfs_attrs(inode->i_sb)) {
|
|
if (sd_attrs & REISERFS_SYNC_FL)
|
|
inode->i_flags |= S_SYNC;
|
|
else
|
|
inode->i_flags &= ~S_SYNC;
|
|
if (sd_attrs & REISERFS_IMMUTABLE_FL)
|
|
inode->i_flags |= S_IMMUTABLE;
|
|
else
|
|
inode->i_flags &= ~S_IMMUTABLE;
|
|
if (sd_attrs & REISERFS_APPEND_FL)
|
|
inode->i_flags |= S_APPEND;
|
|
else
|
|
inode->i_flags &= ~S_APPEND;
|
|
if (sd_attrs & REISERFS_NOATIME_FL)
|
|
inode->i_flags |= S_NOATIME;
|
|
else
|
|
inode->i_flags &= ~S_NOATIME;
|
|
if (sd_attrs & REISERFS_NOTAIL_FL)
|
|
REISERFS_I(inode)->i_flags |= i_nopack_mask;
|
|
else
|
|
REISERFS_I(inode)->i_flags &= ~i_nopack_mask;
|
|
}
|
|
}
|
|
|
|
void i_attrs_to_sd_attrs(struct inode *inode, __u16 * sd_attrs)
|
|
{
|
|
if (reiserfs_attrs(inode->i_sb)) {
|
|
if (inode->i_flags & S_IMMUTABLE)
|
|
*sd_attrs |= REISERFS_IMMUTABLE_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_IMMUTABLE_FL;
|
|
if (inode->i_flags & S_SYNC)
|
|
*sd_attrs |= REISERFS_SYNC_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_SYNC_FL;
|
|
if (inode->i_flags & S_NOATIME)
|
|
*sd_attrs |= REISERFS_NOATIME_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_NOATIME_FL;
|
|
if (REISERFS_I(inode)->i_flags & i_nopack_mask)
|
|
*sd_attrs |= REISERFS_NOTAIL_FL;
|
|
else
|
|
*sd_attrs &= ~REISERFS_NOTAIL_FL;
|
|
}
|
|
}
|
|
|
|
/* decide if this buffer needs to stay around for data logging or ordered
|
|
** write purposes
|
|
*/
|
|
static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
int ret = 1;
|
|
struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
|
|
|
|
lock_buffer(bh);
|
|
spin_lock(&j->j_dirty_buffers_lock);
|
|
if (!buffer_mapped(bh)) {
|
|
goto free_jh;
|
|
}
|
|
/* the page is locked, and the only places that log a data buffer
|
|
* also lock the page.
|
|
*/
|
|
if (reiserfs_file_data_log(inode)) {
|
|
/*
|
|
* very conservative, leave the buffer pinned if
|
|
* anyone might need it.
|
|
*/
|
|
if (buffer_journaled(bh) || buffer_journal_dirty(bh)) {
|
|
ret = 0;
|
|
}
|
|
} else if (buffer_dirty(bh)) {
|
|
struct reiserfs_journal_list *jl;
|
|
struct reiserfs_jh *jh = bh->b_private;
|
|
|
|
/* why is this safe?
|
|
* reiserfs_setattr updates i_size in the on disk
|
|
* stat data before allowing vmtruncate to be called.
|
|
*
|
|
* If buffer was put onto the ordered list for this
|
|
* transaction, we know for sure either this transaction
|
|
* or an older one already has updated i_size on disk,
|
|
* and this ordered data won't be referenced in the file
|
|
* if we crash.
|
|
*
|
|
* if the buffer was put onto the ordered list for an older
|
|
* transaction, we need to leave it around
|
|
*/
|
|
if (jh && (jl = jh->jl)
|
|
&& jl != SB_JOURNAL(inode->i_sb)->j_current_jl)
|
|
ret = 0;
|
|
}
|
|
free_jh:
|
|
if (ret && bh->b_private) {
|
|
reiserfs_free_jh(bh);
|
|
}
|
|
spin_unlock(&j->j_dirty_buffers_lock);
|
|
unlock_buffer(bh);
|
|
return ret;
|
|
}
|
|
|
|
/* clm -- taken from fs/buffer.c:block_invalidate_page */
|
|
static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
|
|
{
|
|
struct buffer_head *head, *bh, *next;
|
|
struct inode *inode = page->mapping->host;
|
|
unsigned int curr_off = 0;
|
|
int ret = 1;
|
|
|
|
BUG_ON(!PageLocked(page));
|
|
|
|
if (offset == 0)
|
|
ClearPageChecked(page);
|
|
|
|
if (!page_has_buffers(page))
|
|
goto out;
|
|
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
unsigned int next_off = curr_off + bh->b_size;
|
|
next = bh->b_this_page;
|
|
|
|
/*
|
|
* is this block fully invalidated?
|
|
*/
|
|
if (offset <= curr_off) {
|
|
if (invalidatepage_can_drop(inode, bh))
|
|
reiserfs_unmap_buffer(bh);
|
|
else
|
|
ret = 0;
|
|
}
|
|
curr_off = next_off;
|
|
bh = next;
|
|
} while (bh != head);
|
|
|
|
/*
|
|
* We release buffers only if the entire page is being invalidated.
|
|
* The get_block cached value has been unconditionally invalidated,
|
|
* so real IO is not possible anymore.
|
|
*/
|
|
if (!offset && ret) {
|
|
ret = try_to_release_page(page, 0);
|
|
/* maybe should BUG_ON(!ret); - neilb */
|
|
}
|
|
out:
|
|
return;
|
|
}
|
|
|
|
static int reiserfs_set_page_dirty(struct page *page)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
if (reiserfs_file_data_log(inode)) {
|
|
SetPageChecked(page);
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
return __set_page_dirty_buffers(page);
|
|
}
|
|
|
|
/*
|
|
* Returns 1 if the page's buffers were dropped. The page is locked.
|
|
*
|
|
* Takes j_dirty_buffers_lock to protect the b_assoc_buffers list_heads
|
|
* in the buffers at page_buffers(page).
|
|
*
|
|
* even in -o notail mode, we can't be sure an old mount without -o notail
|
|
* didn't create files with tails.
|
|
*/
|
|
static int reiserfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
|
|
{
|
|
struct inode *inode = page->mapping->host;
|
|
struct reiserfs_journal *j = SB_JOURNAL(inode->i_sb);
|
|
struct buffer_head *head;
|
|
struct buffer_head *bh;
|
|
int ret = 1;
|
|
|
|
WARN_ON(PageChecked(page));
|
|
spin_lock(&j->j_dirty_buffers_lock);
|
|
head = page_buffers(page);
|
|
bh = head;
|
|
do {
|
|
if (bh->b_private) {
|
|
if (!buffer_dirty(bh) && !buffer_locked(bh)) {
|
|
reiserfs_free_jh(bh);
|
|
} else {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
bh = bh->b_this_page;
|
|
} while (bh != head);
|
|
if (ret)
|
|
ret = try_to_free_buffers(page);
|
|
spin_unlock(&j->j_dirty_buffers_lock);
|
|
return ret;
|
|
}
|
|
|
|
/* We thank Mingming Cao for helping us understand in great detail what
|
|
to do in this section of the code. */
|
|
static ssize_t reiserfs_direct_IO(int rw, struct kiocb *iocb,
|
|
const struct iovec *iov, loff_t offset,
|
|
unsigned long nr_segs)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
|
|
offset, nr_segs,
|
|
reiserfs_get_blocks_direct_io, NULL);
|
|
}
|
|
|
|
int reiserfs_setattr(struct dentry *dentry, struct iattr *attr)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
int error;
|
|
unsigned int ia_valid = attr->ia_valid;
|
|
reiserfs_write_lock(inode->i_sb);
|
|
if (attr->ia_valid & ATTR_SIZE) {
|
|
/* version 2 items will be caught by the s_maxbytes check
|
|
** done for us in vmtruncate
|
|
*/
|
|
if (get_inode_item_key_version(inode) == KEY_FORMAT_3_5 &&
|
|
attr->ia_size > MAX_NON_LFS) {
|
|
error = -EFBIG;
|
|
goto out;
|
|
}
|
|
/* fill in hole pointers in the expanding truncate case. */
|
|
if (attr->ia_size > inode->i_size) {
|
|
error = generic_cont_expand(inode, attr->ia_size);
|
|
if (REISERFS_I(inode)->i_prealloc_count > 0) {
|
|
int err;
|
|
struct reiserfs_transaction_handle th;
|
|
/* we're changing at most 2 bitmaps, inode + super */
|
|
err = journal_begin(&th, inode->i_sb, 4);
|
|
if (!err) {
|
|
reiserfs_discard_prealloc(&th, inode);
|
|
err = journal_end(&th, inode->i_sb, 4);
|
|
}
|
|
if (err)
|
|
error = err;
|
|
}
|
|
if (error)
|
|
goto out;
|
|
/*
|
|
* file size is changed, ctime and mtime are
|
|
* to be updated
|
|
*/
|
|
attr->ia_valid |= (ATTR_MTIME | ATTR_CTIME);
|
|
}
|
|
}
|
|
|
|
if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
|
|
((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
|
|
(get_inode_sd_version(inode) == STAT_DATA_V1)) {
|
|
/* stat data of format v3.5 has 16 bit uid and gid */
|
|
error = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
error = inode_change_ok(inode, attr);
|
|
if (!error) {
|
|
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
|
|
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
|
|
error = reiserfs_chown_xattrs(inode, attr);
|
|
|
|
if (!error) {
|
|
struct reiserfs_transaction_handle th;
|
|
int jbegin_count =
|
|
2 *
|
|
(REISERFS_QUOTA_INIT_BLOCKS(inode->i_sb) +
|
|
REISERFS_QUOTA_DEL_BLOCKS(inode->i_sb)) +
|
|
2;
|
|
|
|
/* (user+group)*(old+new) structure - we count quota info and , inode write (sb, inode) */
|
|
error =
|
|
journal_begin(&th, inode->i_sb,
|
|
jbegin_count);
|
|
if (error)
|
|
goto out;
|
|
error =
|
|
DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
|
|
if (error) {
|
|
journal_end(&th, inode->i_sb,
|
|
jbegin_count);
|
|
goto out;
|
|
}
|
|
/* Update corresponding info in inode so that everything is in
|
|
* one transaction */
|
|
if (attr->ia_valid & ATTR_UID)
|
|
inode->i_uid = attr->ia_uid;
|
|
if (attr->ia_valid & ATTR_GID)
|
|
inode->i_gid = attr->ia_gid;
|
|
mark_inode_dirty(inode);
|
|
error =
|
|
journal_end(&th, inode->i_sb, jbegin_count);
|
|
}
|
|
}
|
|
if (!error)
|
|
error = inode_setattr(inode, attr);
|
|
}
|
|
|
|
if (!error && reiserfs_posixacl(inode->i_sb)) {
|
|
if (attr->ia_valid & ATTR_MODE)
|
|
error = reiserfs_acl_chmod(inode);
|
|
}
|
|
|
|
out:
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return error;
|
|
}
|
|
|
|
const struct address_space_operations reiserfs_address_space_operations = {
|
|
.writepage = reiserfs_writepage,
|
|
.readpage = reiserfs_readpage,
|
|
.readpages = reiserfs_readpages,
|
|
.releasepage = reiserfs_releasepage,
|
|
.invalidatepage = reiserfs_invalidatepage,
|
|
.sync_page = block_sync_page,
|
|
.prepare_write = reiserfs_prepare_write,
|
|
.commit_write = reiserfs_commit_write,
|
|
.bmap = reiserfs_aop_bmap,
|
|
.direct_IO = reiserfs_direct_IO,
|
|
.set_page_dirty = reiserfs_set_page_dirty,
|
|
};
|