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btrfs: start transaction in btrfs_ioctl_setflags() 

Inode attribute can be set through the FS_IOC_SETFLAGS ioctl.  This
flags also includes compression attribute for which we would set/reset
the compression extended attribute. While doing this there is a bit of
duplicate code, the following things happens twice:

- start/end_transaction
- inode_inc_iversion()
- current_time update to inode->i_ctime
- and btrfs_update_inode()

These are updated both at btrfs_ioctl_setflags() and btrfs_set_props()
as well.  This patch merges these two duplicate codes at
btrfs_ioctl_setflags().

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2019-04-20 19:48:53 +08:00 committed by David Sterba
parent cd31af158b
commit ff9fef559b
1 changed files with 25 additions and 20 deletions
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45
fs/btrfs/ioctl.c
View File

@ -192,6 +192,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
u64 old_flags;
unsigned int old_i_flags;
umode_t mode;
const char *comp = NULL;
if (!inode_owner_or_capable(inode))
return -EPERM;
@ -283,14 +284,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
if (fsflags & FS_NOCOMP_FL) {
binode->flags &= ~BTRFS_INODE_COMPRESS;
binode->flags |= BTRFS_INODE_NOCOMPRESS;
/* set no-compression no need to validate prop here */
ret = btrfs_set_prop_trans(inode, "btrfs.compression", NULL,
0, 0);
if (ret && ret != -ENODATA)
goto out_drop;
} else if (fsflags & FS_COMPR_FL) {
const char *comp;
if (IS_SWAPFILE(inode)) {
ret = -ETXTBSY;
@ -300,36 +294,47 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
binode->flags |= BTRFS_INODE_COMPRESS;
binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
/* compress_type is already validated during mount options */
comp = btrfs_compress_type2str(fs_info->compress_type);
if (!comp || comp[0] == 0)
comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
ret = btrfs_set_prop_trans(inode, "btrfs.compression", comp,
strlen(comp), 0);
if (ret)
goto out_drop;
} else {
/* reset prop, no need of validate prop here */
ret = btrfs_set_prop_trans(inode, "btrfs.compression", NULL,
0, 0);
if (ret && ret != -ENODATA)
goto out_drop;
binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
}
trans = btrfs_start_transaction(root, 1);
/*
* 1 for inode item
* 2 for properties
*/
trans = btrfs_start_transaction(root, 3);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out_drop;
}
if (comp) {
ret = btrfs_set_prop(trans, inode, "btrfs.compression", comp,
strlen(comp), 0);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out_end_trans;
}
set_bit(BTRFS_INODE_COPY_EVERYTHING,
&BTRFS_I(inode)->runtime_flags);
} else {
ret = btrfs_set_prop(trans, inode, "btrfs.compression", NULL,
0, 0);
if (ret && ret != -ENODATA) {
btrfs_abort_transaction(trans, ret);
goto out_end_trans;
}
}
btrfs_sync_inode_flags_to_i_flags(inode);
inode_inc_iversion(inode);
inode->i_ctime = current_time(inode);
ret = btrfs_update_inode(trans, root, inode);
out_end_trans:
btrfs_end_transaction(trans);
out_drop:
if (ret) {