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btrfs: modify local copy of btrfs_inode flags 

Instead of updating the binode::flags directly, update a local copy, and
then at the point of no error, store copy it to the binode::flags.

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 19:48:55 +08:00 committed by David Sterba
parent 11d3cd5c62
commit d2b8fcfe43
1 changed files with 26 additions and 31 deletions
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57
fs/btrfs/ioctl.c
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@ -189,9 +189,9 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
struct btrfs_trans_handle *trans;
unsigned int fsflags, old_fsflags;
int ret;
u64 old_flags;
umode_t mode;
const char *comp = NULL;
u32 binode_flags = binode->flags;
if (!inode_owner_or_capable(inode))
return -EPERM;
@ -212,7 +212,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
inode_lock(inode);
old_flags = binode->flags;
mode = inode->i_mode;
fsflags = btrfs_mask_fsflags_for_type(inode, fsflags);
@ -225,29 +224,29 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
}
if (fsflags & FS_SYNC_FL)
binode->flags |= BTRFS_INODE_SYNC;
binode_flags |= BTRFS_INODE_SYNC;
else
binode->flags &= ~BTRFS_INODE_SYNC;
binode_flags &= ~BTRFS_INODE_SYNC;
if (fsflags & FS_IMMUTABLE_FL)
binode->flags |= BTRFS_INODE_IMMUTABLE;
binode_flags |= BTRFS_INODE_IMMUTABLE;
else
binode->flags &= ~BTRFS_INODE_IMMUTABLE;
binode_flags &= ~BTRFS_INODE_IMMUTABLE;
if (fsflags & FS_APPEND_FL)
binode->flags |= BTRFS_INODE_APPEND;
binode_flags |= BTRFS_INODE_APPEND;
else
binode->flags &= ~BTRFS_INODE_APPEND;
binode_flags &= ~BTRFS_INODE_APPEND;
if (fsflags & FS_NODUMP_FL)
binode->flags |= BTRFS_INODE_NODUMP;
binode_flags |= BTRFS_INODE_NODUMP;
else
binode->flags &= ~BTRFS_INODE_NODUMP;
binode_flags &= ~BTRFS_INODE_NODUMP;
if (fsflags & FS_NOATIME_FL)
binode->flags |= BTRFS_INODE_NOATIME;
binode_flags |= BTRFS_INODE_NOATIME;
else
binode->flags &= ~BTRFS_INODE_NOATIME;
binode_flags &= ~BTRFS_INODE_NOATIME;
if (fsflags & FS_DIRSYNC_FL)
binode->flags |= BTRFS_INODE_DIRSYNC;
binode_flags |= BTRFS_INODE_DIRSYNC;
else
binode->flags &= ~BTRFS_INODE_DIRSYNC;
binode_flags &= ~BTRFS_INODE_DIRSYNC;
if (fsflags & FS_NOCOW_FL) {
if (S_ISREG(mode)) {
/*
@ -256,10 +255,10 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
* status of the file and will not set it.
*/
if (inode->i_size == 0)
binode->flags |= BTRFS_INODE_NODATACOW
| BTRFS_INODE_NODATASUM;
binode_flags |= BTRFS_INODE_NODATACOW |
BTRFS_INODE_NODATASUM;
} else {
binode->flags |= BTRFS_INODE_NODATACOW;
binode_flags |= BTRFS_INODE_NODATACOW;
}
} else {
/*
@ -267,10 +266,10 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
*/
if (S_ISREG(mode)) {
if (inode->i_size == 0)
binode->flags &= ~(BTRFS_INODE_NODATACOW
| BTRFS_INODE_NODATASUM);
binode_flags &= ~(BTRFS_INODE_NODATACOW |
BTRFS_INODE_NODATASUM);
} else {
binode->flags &= ~BTRFS_INODE_NODATACOW;
binode_flags &= ~BTRFS_INODE_NODATACOW;
}
}
@ -280,8 +279,8 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
* things smaller.
*/
if (fsflags & FS_NOCOMP_FL) {
binode->flags &= ~BTRFS_INODE_COMPRESS;
binode->flags |= BTRFS_INODE_NOCOMPRESS;
binode_flags &= ~BTRFS_INODE_COMPRESS;
binode_flags |= BTRFS_INODE_NOCOMPRESS;
} else if (fsflags & FS_COMPR_FL) {
if (IS_SWAPFILE(inode)) {
@ -289,14 +288,14 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
goto out_unlock;
}
binode->flags |= BTRFS_INODE_COMPRESS;
binode->flags &= ~BTRFS_INODE_NOCOMPRESS;
binode_flags |= BTRFS_INODE_COMPRESS;
binode_flags &= ~BTRFS_INODE_NOCOMPRESS;
comp = btrfs_compress_type2str(fs_info->compress_type);
if (!comp || comp[0] == 0)
comp = btrfs_compress_type2str(BTRFS_COMPRESS_ZLIB);
} else {
binode->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
binode_flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
}
/*
@ -306,7 +305,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
trans = btrfs_start_transaction(root, 3);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out_drop;
goto out_unlock;
}
if (comp) {
@ -327,6 +326,7 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
}
}
binode->flags = binode_flags;
btrfs_sync_inode_flags_to_i_flags(inode);
inode_inc_iversion(inode);
inode->i_ctime = current_time(inode);
@ -334,11 +334,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
out_end_trans:
btrfs_end_transaction(trans);
out_drop:
if (ret) {
binode->flags = old_flags;
}
out_unlock:
inode_unlock(inode);
mnt_drop_write_file(file);