When inode attribute flags is set through FS_IOC_SETFLAGS ioctl, there is
a bit of duplicate codes, 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. (RFC: So inode
version and the generation number should have increased by +2, but I
don't see that in the test case below ran without this patch)
This patch merges these two duplicate codes at btrfs_ioctl_setflags().
$ cat a
mkfs.btrfs -fq /dev/sdb || exit
mount /dev/sdb /btrfs
touch /btrfs/file1
sync
echo before:
btrfs in dump-super /dev/sdb | grep ^generation
btrfs in dump-tree /dev/sdb | grep -A4 "257 XATTR_ITEM"
btrfs in dump-tree /dev/sdb | grep -A4 "257 INODE_ITEM 0) item"
echo
echo "chattr +Ac /btrfs/file1"
chattr +Ac /btrfs/file1
sync
echo after:
btrfs in dump-super /dev/sdb | grep ^generation
btrfs in dump-tree /dev/sdb | grep -A4 "257 XATTR_ITEM"
btrfs in dump-tree /dev/sdb | grep -A4 "257 INODE_ITEM 0) item"
$ umount /btrfs; ./a
before:
generation 6
item 4 key (257 INODE_ITEM 0) itemoff 15881 itemsize 160
generation 6 transid 6 size 0 nbytes 0
block group 0 mode 100644 links 1 uid 0 gid 0 rdev 0
sequence 19 flags 0x0(none)
chattr +Ac /btrfs/file1
after:
generation 7
item 6 key (257 XATTR_ITEM 550297449) itemoff 15815 itemsize 51
location key (0 UNKNOWN.0 0) type XATTR
transid 7 data_len 4 name_len 17
name: btrfs.compression
data zlib
item 4 key (257 INODE_ITEM 0) itemoff 15881 itemsize 160
generation 6 transid 7 size 0 nbytes 0
block group 0 mode 100644 links 1 uid 0 gid 0 rdev 0
sequence 21 flags 0xa00(NOATIME|COMPRESS)
Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
fs/btrfs/ioctl.c | 38 ++++++++++++++++++--------------------
fs/btrfs/props.c | 6 +++---
fs/btrfs/props.h | 3 +++
3 files changed, 24 insertions(+), 23 deletions(-)
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 63e6e2f5b659..82772523bb87 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -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 +294,40 @@ 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);
+ 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)
+ goto out_abort;
+ 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)
+ goto out_abort;
+ }
+
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_abort:
+ if (ret)
+ btrfs_abort_transaction(trans, ret);
btrfs_end_transaction(trans);
out_drop:
if (ret) {
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index e356dd2a0f73..aedf5a7d69c9 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -72,9 +72,9 @@ int btrfs_validate_prop(const char *name, const char *value,
size_t value_len)
return handler->validate(value, value_len);
}
-static int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode
*inode,
- const char *name, const char *value, size_t value_len,
- int flags)
+int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
+ const char *name, const char *value, size_t value_len,
+ int flags)
{
const struct prop_handler *handler;
int ret;
diff --git a/fs/btrfs/props.h b/fs/btrfs/props.h
index 01d2c1899bc7..30b99348977d 100644
--- a/fs/btrfs/props.h
+++ b/fs/btrfs/props.h
@@ -12,6 +12,9 @@ void __init btrfs_props_init(void);
int btrfs_set_prop_trans(struct inode *inode, const char *name,
const char *value, size_t value_len, int flags);
+int btrfs_set_prop(struct btrfs_trans_handle *trans, struct inode *inode,
+ const char *name, const char *value, size_t value_len,
+ int flags);
int btrfs_validate_prop(const char *name, const char *value, size_t value_len);
int btrfs_load_inode_props(struct inode *inode, struct btrfs_path *path);
--
2.17.1
