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fs/ext4: Only change S_DAX on inode load 

To prevent complications with in memory inodes we only set S_DAX on
inode load.  FS_XFLAG_DAX can be changed at any time and S_DAX will
change after inode eviction and reload.

Add init bool to ext4_set_inode_flags() to indicate if the inode is
being newly initialized.

Assert that S_DAX is not set on an inode which is just being loaded.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>

Link: https://lore.kernel.org/r/20200528150003.828793-6-ira.weiny@intel.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ira Weiny 2020-05-28 07:59:59 -07:00 committed by Theodore Ts'o
parent a8ab6d3885
commit 043546e46d
6 changed files with 17 additions and 9 deletions
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2
fs/ext4/ext4.h
View File

@ -2693,7 +2693,7 @@ extern int ext4_can_truncate(struct inode *inode);
extern int ext4_truncate(struct inode *);
extern int ext4_break_layouts(struct inode *);
extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
extern void ext4_set_inode_flags(struct inode *);
extern void ext4_set_inode_flags(struct inode *, bool init);
extern int ext4_alloc_da_blocks(struct inode *inode);
extern void ext4_set_aops(struct inode *inode);
extern int ext4_writepage_trans_blocks(struct inode *);

2
fs/ext4/ialloc.c
View File

@ -1116,7 +1116,7 @@ struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir,
ei->i_block_group = group;
ei->i_last_alloc_group = ~0;
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, true);
if (IS_DIRSYNC(inode))
ext4_handle_sync(handle);
if (insert_inode_locked(inode) < 0) {

13
fs/ext4/inode.c
View File

@ -4420,11 +4420,13 @@ static bool ext4_should_enable_dax(struct inode *inode)
return false;
}
void ext4_set_inode_flags(struct inode *inode)
void ext4_set_inode_flags(struct inode *inode, bool init)
{
unsigned int flags = EXT4_I(inode)->i_flags;
unsigned int new_fl = 0;
WARN_ON_ONCE(IS_DAX(inode) && init);
if (flags & EXT4_SYNC_FL)
new_fl |= S_SYNC;
if (flags & EXT4_APPEND_FL)
@ -4435,8 +4437,13 @@ void ext4_set_inode_flags(struct inode *inode)
new_fl |= S_NOATIME;
if (flags & EXT4_DIRSYNC_FL)
new_fl |= S_DIRSYNC;
if (ext4_should_enable_dax(inode))
/* Because of the way inode_set_flags() works we must preserve S_DAX
* here if already set. */
new_fl |= (inode->i_flags & S_DAX);
if (init && ext4_should_enable_dax(inode))
new_fl |= S_DAX;
if (flags & EXT4_ENCRYPT_FL)
new_fl |= S_ENCRYPTED;
if (flags & EXT4_CASEFOLD_FL)
@ -4650,7 +4657,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
* not initialized on a new filesystem. */
}
ei->i_flags = le32_to_cpu(raw_inode->i_flags);
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, true);
inode->i_blocks = ext4_inode_blocks(raw_inode, ei);
ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl_lo);
if (ext4_has_feature_64bit(sb))

3
fs/ext4/ioctl.c
View File

@ -381,7 +381,8 @@ static int ext4_ioctl_setflags(struct inode *inode,
ext4_clear_inode_flag(inode, i);
}
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, false);
inode->i_ctime = current_time(inode);
err = ext4_mark_iloc_dirty(handle, inode, &iloc);

4
fs/ext4/super.c
View File

@ -1348,7 +1348,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
* Update inode->i_flags - S_ENCRYPTED will be enabled,
* S_DAX may be disabled
*/
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, false);
}
return res;
}
@ -1375,7 +1375,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
* Update inode->i_flags - S_ENCRYPTED will be enabled,
* S_DAX may be disabled
*/
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, false);
res = ext4_mark_inode_dirty(handle, inode);
if (res)
EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");

2
fs/ext4/verity.c
View File

@ -244,7 +244,7 @@ static int ext4_end_enable_verity(struct file *filp, const void *desc,
if (err)
goto out_stop;
ext4_set_inode_flag(inode, EXT4_INODE_VERITY);
ext4_set_inode_flags(inode);
ext4_set_inode_flags(inode, false);
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
}
out_stop: