044b9414c7
This area of the code has always been a bit delicate due to the subtleties of lock ordering. The problem is that for "normal" alloc/dealloc, we always grab the inode locks first and the rgrp lock later. In order to ensure no races in looking up the unlinked, but still allocated inodes, we need to hold the rgrp lock when we do the lookup, which means that we can't take the inode glock. The solution is to borrow the technique already used by NFS to solve what is essentially the same problem (given an inode number, look up the inode carefully, checking that it really is in the expected state). We cannot do that directly from the allocation code (lock ordering again) so we give the job to the pre-existing delete workqueue and carry on with the allocation as normal. If we find there is no space, we do a journal flush (required anyway if space from a deallocation is to be released) which should block against the pending deallocations, so we should always get the space back. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
150 lines
4.7 KiB
C
150 lines
4.7 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __INODE_DOT_H__
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#define __INODE_DOT_H__
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/mm.h>
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#include "util.h"
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extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
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extern int gfs2_internal_read(struct gfs2_inode *ip,
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struct file_ra_state *ra_state,
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char *buf, loff_t *pos, unsigned size);
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extern void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
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unsigned int from, unsigned int to);
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extern void gfs2_set_aops(struct inode *inode);
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static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
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{
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return !ip->i_height;
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}
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static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
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{
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return ip->i_diskflags & GFS2_DIF_JDATA;
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}
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static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
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{
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const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
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}
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static inline int gfs2_is_ordered(const struct gfs2_inode *ip)
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{
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const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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return (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) && !gfs2_is_jdata(ip);
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}
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static inline int gfs2_is_dir(const struct gfs2_inode *ip)
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{
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return S_ISDIR(ip->i_inode.i_mode);
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}
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static inline void gfs2_set_inode_blocks(struct inode *inode, u64 blocks)
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{
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inode->i_blocks = blocks <<
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(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
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}
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static inline u64 gfs2_get_inode_blocks(const struct inode *inode)
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{
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return inode->i_blocks >>
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(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
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}
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static inline void gfs2_add_inode_blocks(struct inode *inode, s64 change)
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{
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gfs2_assert(GFS2_SB(inode), (change >= 0 || inode->i_blocks > -change));
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change *= (GFS2_SB(inode)->sd_sb.sb_bsize/GFS2_BASIC_BLOCK);
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inode->i_blocks += change;
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}
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static inline int gfs2_check_inum(const struct gfs2_inode *ip, u64 no_addr,
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u64 no_formal_ino)
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{
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return ip->i_no_addr == no_addr && ip->i_no_formal_ino == no_formal_ino;
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}
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static inline void gfs2_inum_out(const struct gfs2_inode *ip,
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struct gfs2_dirent *dent)
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{
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dent->de_inum.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
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dent->de_inum.no_addr = cpu_to_be64(ip->i_no_addr);
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}
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static inline int gfs2_check_internal_file_size(struct inode *inode,
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u64 minsize, u64 maxsize)
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{
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u64 size = i_size_read(inode);
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if (size < minsize || size > maxsize)
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goto err;
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if (size & ((1 << inode->i_blkbits) - 1))
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goto err;
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return 0;
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err:
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gfs2_consist_inode(GFS2_I(inode));
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return -EIO;
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}
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extern void gfs2_set_iop(struct inode *inode);
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extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
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u64 no_addr, u64 no_formal_ino);
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extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
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u64 *no_formal_ino,
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unsigned int blktype);
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extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr);
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extern int gfs2_inode_refresh(struct gfs2_inode *ip);
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extern int gfs2_dinode_dealloc(struct gfs2_inode *inode);
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extern int gfs2_change_nlink(struct gfs2_inode *ip, int diff);
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extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
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int is_root);
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extern struct inode *gfs2_createi(struct gfs2_holder *ghs,
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const struct qstr *name,
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unsigned int mode, dev_t dev);
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extern int gfs2_permission(struct inode *inode, int mask);
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extern int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
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extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
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extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
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extern void gfs2_dinode_print(const struct gfs2_inode *ip);
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extern const struct inode_operations gfs2_file_iops;
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extern const struct inode_operations gfs2_dir_iops;
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extern const struct inode_operations gfs2_symlink_iops;
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extern const struct file_operations gfs2_file_fops_nolock;
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extern const struct file_operations gfs2_dir_fops_nolock;
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extern void gfs2_set_inode_flags(struct inode *inode);
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#ifdef CONFIG_GFS2_FS_LOCKING_DLM
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extern const struct file_operations gfs2_file_fops;
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extern const struct file_operations gfs2_dir_fops;
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static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
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{
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return sdp->sd_args.ar_localflocks;
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}
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#else /* Single node only */
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#define gfs2_file_fops gfs2_file_fops_nolock
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#define gfs2_dir_fops gfs2_dir_fops_nolock
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static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
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{
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return 1;
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}
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#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
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#endif /* __INODE_DOT_H__ */
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