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Btrfs: Add a write ahead tree log to optimize synchronous operations

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File syncs and directory syncs are optimized by copying their
items into a special (copy-on-write) log tree.  There is one log tree per
subvolume and the btrfs super block points to a tree of log tree roots.

After a crash, items are copied out of the log tree and back into the
subvolume.  See tree-log.c for all the details.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-09-05 16:13:11 -04:00
parent a1b32a5932
commit e02119d5a7
17 changed files with 3408 additions and 205 deletions
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15
fs/btrfs/compat.h
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@ -22,6 +22,21 @@ static inline struct dentry *d_obtain_alias(struct inode *inode)
}
#endif
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
static inline void btrfs_drop_nlink(struct inode *inode)
{
inode->i_nlink--;
}
static inline void btrfs_inc_nlink(struct inode *inode)
{
inode->i_nlink++;
}
#else
# define btrfs_drop_nlink(inode) drop_nlink(inode)
# define btrfs_inc_nlink(inode) inc_nlink(inode)
#endif
/*
* Even if AppArmor isn't enabled, it still has different prototypes.
* Add more distro/version pairs here to declare which has AppArmor applied.