77e69dac3c
* new helper: vfs_quota_on_path(); equivalent of vfs_quota_on() sans the pathname resolution. * callers of vfs_quota_on() that do their own pathname resolution and checks based on it are switched to vfs_quota_on_path(); that way we avoid the races. * reiserfs leaked dentry/vfsmount references on several failure exits. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
370 lines
9.8 KiB
C
370 lines
9.8 KiB
C
/*
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* Definitions for diskquota-operations. When diskquota is configured these
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* macros expand to the right source-code.
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*
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* Author: Marco van Wieringen <mvw@planets.elm.net>
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*
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* Version: $Id: quotaops.h,v 1.2 1998/01/15 16:22:26 ecd Exp $
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*
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*/
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#ifndef _LINUX_QUOTAOPS_
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#define _LINUX_QUOTAOPS_
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#include <linux/smp_lock.h>
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#include <linux/fs.h>
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static inline struct quota_info *sb_dqopt(struct super_block *sb)
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{
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return &sb->s_dquot;
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}
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#if defined(CONFIG_QUOTA)
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/*
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* declaration of quota_function calls in kernel.
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*/
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void sync_dquots(struct super_block *sb, int type);
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int dquot_initialize(struct inode *inode, int type);
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int dquot_drop(struct inode *inode);
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int dquot_alloc_space(struct inode *inode, qsize_t number, int prealloc);
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int dquot_alloc_inode(const struct inode *inode, unsigned long number);
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int dquot_free_space(struct inode *inode, qsize_t number);
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int dquot_free_inode(const struct inode *inode, unsigned long number);
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int dquot_transfer(struct inode *inode, struct iattr *iattr);
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int dquot_commit(struct dquot *dquot);
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int dquot_acquire(struct dquot *dquot);
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int dquot_release(struct dquot *dquot);
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int dquot_commit_info(struct super_block *sb, int type);
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int dquot_mark_dquot_dirty(struct dquot *dquot);
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int vfs_quota_on(struct super_block *sb, int type, int format_id,
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char *path, int remount);
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int vfs_quota_on_path(struct super_block *sb, int type, int format_id,
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struct path *path);
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int vfs_quota_on_mount(struct super_block *sb, char *qf_name,
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int format_id, int type);
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int vfs_quota_off(struct super_block *sb, int type, int remount);
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int vfs_quota_sync(struct super_block *sb, int type);
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int vfs_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
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int vfs_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
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int vfs_get_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
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int vfs_set_dqblk(struct super_block *sb, int type, qid_t id, struct if_dqblk *di);
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void vfs_dq_drop(struct inode *inode);
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int vfs_dq_transfer(struct inode *inode, struct iattr *iattr);
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int vfs_dq_quota_on_remount(struct super_block *sb);
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static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
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{
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return sb_dqopt(sb)->info + type;
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}
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/*
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* Functions for checking status of quota
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*/
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static inline int sb_has_quota_enabled(struct super_block *sb, int type)
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{
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if (type == USRQUOTA)
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return sb_dqopt(sb)->flags & DQUOT_USR_ENABLED;
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return sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED;
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}
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static inline int sb_any_quota_enabled(struct super_block *sb)
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{
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return sb_has_quota_enabled(sb, USRQUOTA) ||
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sb_has_quota_enabled(sb, GRPQUOTA);
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}
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static inline int sb_has_quota_suspended(struct super_block *sb, int type)
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{
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if (type == USRQUOTA)
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return sb_dqopt(sb)->flags & DQUOT_USR_SUSPENDED;
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return sb_dqopt(sb)->flags & DQUOT_GRP_SUSPENDED;
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}
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static inline int sb_any_quota_suspended(struct super_block *sb)
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{
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return sb_has_quota_suspended(sb, USRQUOTA) ||
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sb_has_quota_suspended(sb, GRPQUOTA);
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}
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/*
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* Operations supported for diskquotas.
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*/
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extern struct dquot_operations dquot_operations;
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extern struct quotactl_ops vfs_quotactl_ops;
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#define sb_dquot_ops (&dquot_operations)
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#define sb_quotactl_ops (&vfs_quotactl_ops)
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/* It is better to call this function outside of any transaction as it might
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* need a lot of space in journal for dquot structure allocation. */
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static inline void vfs_dq_init(struct inode *inode)
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{
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BUG_ON(!inode->i_sb);
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if (sb_any_quota_enabled(inode->i_sb) && !IS_NOQUOTA(inode))
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inode->i_sb->dq_op->initialize(inode, -1);
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}
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/* The following allocation/freeing/transfer functions *must* be called inside
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* a transaction (deadlocks possible otherwise) */
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static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
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{
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if (sb_any_quota_enabled(inode->i_sb)) {
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/* Used space is updated in alloc_space() */
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if (inode->i_sb->dq_op->alloc_space(inode, nr, 1) == NO_QUOTA)
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return 1;
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}
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else
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inode_add_bytes(inode, nr);
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return 0;
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}
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static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
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{
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int ret;
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if (!(ret = vfs_dq_prealloc_space_nodirty(inode, nr)))
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mark_inode_dirty(inode);
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return ret;
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}
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static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
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{
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if (sb_any_quota_enabled(inode->i_sb)) {
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/* Used space is updated in alloc_space() */
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if (inode->i_sb->dq_op->alloc_space(inode, nr, 0) == NO_QUOTA)
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return 1;
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}
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else
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inode_add_bytes(inode, nr);
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return 0;
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}
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static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
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{
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int ret;
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if (!(ret = vfs_dq_alloc_space_nodirty(inode, nr)))
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mark_inode_dirty(inode);
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return ret;
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}
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static inline int vfs_dq_alloc_inode(struct inode *inode)
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{
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if (sb_any_quota_enabled(inode->i_sb)) {
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vfs_dq_init(inode);
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if (inode->i_sb->dq_op->alloc_inode(inode, 1) == NO_QUOTA)
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return 1;
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}
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return 0;
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}
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static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
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{
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if (sb_any_quota_enabled(inode->i_sb))
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inode->i_sb->dq_op->free_space(inode, nr);
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else
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inode_sub_bytes(inode, nr);
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}
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static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
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{
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vfs_dq_free_space_nodirty(inode, nr);
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mark_inode_dirty(inode);
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}
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static inline void vfs_dq_free_inode(struct inode *inode)
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{
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if (sb_any_quota_enabled(inode->i_sb))
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inode->i_sb->dq_op->free_inode(inode, 1);
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}
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/* The following two functions cannot be called inside a transaction */
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static inline void vfs_dq_sync(struct super_block *sb)
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{
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sync_dquots(sb, -1);
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}
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static inline int vfs_dq_off(struct super_block *sb, int remount)
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{
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int ret = -ENOSYS;
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if (sb->s_qcop && sb->s_qcop->quota_off)
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ret = sb->s_qcop->quota_off(sb, -1, remount);
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return ret;
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}
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#else
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static inline int sb_has_quota_enabled(struct super_block *sb, int type)
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{
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return 0;
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}
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static inline int sb_any_quota_enabled(struct super_block *sb)
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{
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return 0;
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}
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static inline int sb_has_quota_suspended(struct super_block *sb, int type)
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{
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return 0;
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}
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static inline int sb_any_quota_suspended(struct super_block *sb)
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{
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return 0;
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}
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/*
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* NO-OP when quota not configured.
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*/
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#define sb_dquot_ops (NULL)
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#define sb_quotactl_ops (NULL)
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static inline void vfs_dq_init(struct inode *inode)
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{
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}
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static inline void vfs_dq_drop(struct inode *inode)
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{
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}
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static inline int vfs_dq_alloc_inode(struct inode *inode)
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{
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return 0;
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}
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static inline void vfs_dq_free_inode(struct inode *inode)
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{
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}
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static inline void vfs_dq_sync(struct super_block *sb)
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{
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}
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static inline int vfs_dq_off(struct super_block *sb, int remount)
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{
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return 0;
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}
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static inline int vfs_dq_quota_on_remount(struct super_block *sb)
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{
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return 0;
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}
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static inline int vfs_dq_transfer(struct inode *inode, struct iattr *iattr)
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{
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return 0;
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}
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static inline int vfs_dq_prealloc_space_nodirty(struct inode *inode, qsize_t nr)
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{
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inode_add_bytes(inode, nr);
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return 0;
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}
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static inline int vfs_dq_prealloc_space(struct inode *inode, qsize_t nr)
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{
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vfs_dq_prealloc_space_nodirty(inode, nr);
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mark_inode_dirty(inode);
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return 0;
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}
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static inline int vfs_dq_alloc_space_nodirty(struct inode *inode, qsize_t nr)
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{
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inode_add_bytes(inode, nr);
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return 0;
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}
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static inline int vfs_dq_alloc_space(struct inode *inode, qsize_t nr)
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{
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vfs_dq_alloc_space_nodirty(inode, nr);
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mark_inode_dirty(inode);
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return 0;
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}
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static inline void vfs_dq_free_space_nodirty(struct inode *inode, qsize_t nr)
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{
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inode_sub_bytes(inode, nr);
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}
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static inline void vfs_dq_free_space(struct inode *inode, qsize_t nr)
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{
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vfs_dq_free_space_nodirty(inode, nr);
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mark_inode_dirty(inode);
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}
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#endif /* CONFIG_QUOTA */
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static inline int vfs_dq_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
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{
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return vfs_dq_prealloc_space_nodirty(inode,
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nr << inode->i_sb->s_blocksize_bits);
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}
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static inline int vfs_dq_prealloc_block(struct inode *inode, qsize_t nr)
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{
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return vfs_dq_prealloc_space(inode,
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nr << inode->i_sb->s_blocksize_bits);
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}
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static inline int vfs_dq_alloc_block_nodirty(struct inode *inode, qsize_t nr)
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{
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return vfs_dq_alloc_space_nodirty(inode,
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nr << inode->i_sb->s_blocksize_bits);
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}
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static inline int vfs_dq_alloc_block(struct inode *inode, qsize_t nr)
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{
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return vfs_dq_alloc_space(inode,
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nr << inode->i_sb->s_blocksize_bits);
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}
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static inline void vfs_dq_free_block_nodirty(struct inode *inode, qsize_t nr)
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{
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vfs_dq_free_space_nodirty(inode, nr << inode->i_sb->s_blocksize_bits);
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}
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static inline void vfs_dq_free_block(struct inode *inode, qsize_t nr)
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{
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vfs_dq_free_space(inode, nr << inode->i_sb->s_blocksize_bits);
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}
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/*
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* Define uppercase equivalents for compatibility with old function names
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* Can go away when we think all users have been converted (15/04/2008)
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*/
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#define DQUOT_INIT(inode) vfs_dq_init(inode)
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#define DQUOT_DROP(inode) vfs_dq_drop(inode)
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#define DQUOT_PREALLOC_SPACE_NODIRTY(inode, nr) \
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vfs_dq_prealloc_space_nodirty(inode, nr)
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#define DQUOT_PREALLOC_SPACE(inode, nr) vfs_dq_prealloc_space(inode, nr)
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#define DQUOT_ALLOC_SPACE_NODIRTY(inode, nr) \
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vfs_dq_alloc_space_nodirty(inode, nr)
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#define DQUOT_ALLOC_SPACE(inode, nr) vfs_dq_alloc_space(inode, nr)
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#define DQUOT_PREALLOC_BLOCK_NODIRTY(inode, nr) \
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vfs_dq_prealloc_block_nodirty(inode, nr)
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#define DQUOT_PREALLOC_BLOCK(inode, nr) vfs_dq_prealloc_block(inode, nr)
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#define DQUOT_ALLOC_BLOCK_NODIRTY(inode, nr) \
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vfs_dq_alloc_block_nodirty(inode, nr)
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#define DQUOT_ALLOC_BLOCK(inode, nr) vfs_dq_alloc_block(inode, nr)
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#define DQUOT_ALLOC_INODE(inode) vfs_dq_alloc_inode(inode)
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#define DQUOT_FREE_SPACE_NODIRTY(inode, nr) \
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vfs_dq_free_space_nodirty(inode, nr)
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#define DQUOT_FREE_SPACE(inode, nr) vfs_dq_free_space(inode, nr)
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#define DQUOT_FREE_BLOCK_NODIRTY(inode, nr) \
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vfs_dq_free_block_nodirty(inode, nr)
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#define DQUOT_FREE_BLOCK(inode, nr) vfs_dq_free_block(inode, nr)
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#define DQUOT_FREE_INODE(inode) vfs_dq_free_inode(inode)
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#define DQUOT_TRANSFER(inode, iattr) vfs_dq_transfer(inode, iattr)
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#define DQUOT_SYNC(sb) vfs_dq_sync(sb)
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#define DQUOT_OFF(sb, remount) vfs_dq_off(sb, remount)
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#define DQUOT_ON_REMOUNT(sb) vfs_dq_quota_on_remount(sb)
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#endif /* _LINUX_QUOTAOPS_ */
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