VFS: introduce s_dirty accessors
This patch introduces 3 VFS accessors: 'sb_mark_dirty()', 'sb_mark_clean()', and 'sb_is_dirty()'. They simply set 'sb->s_dirt' or test 'sb->s_dirt'. The plan is to make every FS use these accessors later instead of manipulating the 'sb->s_dirt' flag directly. Ultimately, this change is a preparation for the periodic superblock synchronization optimization which is about preventing the "sync_supers" kernel thread from waking up even if there is nothing to synchronize. This patch does not do any functional change, just adds accessor functions. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1783,6 +1783,19 @@ extern int get_sb_pseudo(struct file_system_type *, char *,
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struct vfsmount *mnt);
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extern void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
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static inline void sb_mark_dirty(struct super_block *sb)
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{
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sb->s_dirt = 1;
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}
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static inline void sb_mark_clean(struct super_block *sb)
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{
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sb->s_dirt = 0;
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}
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static inline int sb_is_dirty(struct super_block *sb)
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{
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return sb->s_dirt;
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}
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/* Alas, no aliases. Too much hassle with bringing module.h everywhere */
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#define fops_get(fops) \
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(((fops) && try_module_get((fops)->owner) ? (fops) : NULL))
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