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btrfs: add cancellation points to defrag 

The defrag operation can take very long, we want to have a way how to
cancel it. The code checks for a pending signal at safe points in the
defrag loops and returns EAGAIN. This means a user can press ^C after
running 'btrfs fi defrag', woks for both defrag modes, files and root.

Returning from the command was instant in my light tests, but may take
longer depending on the aging factor of the filesystem.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
David Sterba 2013-02-09 23:38:06 +00:00 committed by Josef Bacik
parent b069e0c345
commit 210549ebe9
3 changed files with 19 additions and 0 deletions
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7
fs/btrfs/ctree.h
View File

@ -3786,4 +3786,11 @@ static inline int is_fstree(u64 rootid)
return 1;
return 0;
}
static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
{
return signal_pending(current);
}
#endif

6
fs/btrfs/ioctl.c
View File

@ -1202,6 +1202,12 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
if (!(inode->i_sb->s_flags & MS_ACTIVE))
break;
if (btrfs_defrag_cancelled(root->fs_info)) {
printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
ret = -EAGAIN;
break;
}
if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT,
extent_thresh, &last_len, &skip,
&defrag_end, range->flags &

6
fs/btrfs/transaction.c
View File

@ -984,6 +984,12 @@ int btrfs_defrag_root(struct btrfs_root *root)
if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN)
break;
if (btrfs_defrag_cancelled(root->fs_info)) {
printk(KERN_DEBUG "btrfs: defrag_root cancelled\n");
ret = -EAGAIN;
break;
}
}
root->defrag_running = 0;
return ret;