Aneesh Kumar K.V wrote:
>> How about enabling it only for directory and regular files rather than
>> enabling it globally and then disabling the flag for symlink and device
>> files ?
>>
>
> how about something like below. There are two reason for not inheriting
> the i_flag from directory.
Looks about right to me... see below
>
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index d2c2e55..f430939 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -794,7 +794,12 @@ got:
> ei->i_dir_start_lookup = 0;
> ei->i_disksize = 0;
>
> - ei->i_flags = EXT4_I(dir)->i_flags & ~EXT4_INDEX_FL;
> + /*
> + * Don't inherit extent flag from directory. We set extent flag on
> + * newly created directory and file only if -o extent mount option is
> + * specfied
nitpick: ^^^^ typo
> + */
> + ei->i_flags = EXT4_I(dir)->i_flags & ~ (EXT4_INDEX_FL|EXT4_EXTENTS_FL);
> if (S_ISLNK(mode))
> ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL);
> /* dirsync only applies to directories */
> @@ -836,8 +841,10 @@ got:
> ext4_std_error(sb, err);
> goto fail_free_drop;
> }
> - if (test_opt(sb, EXTENTS) && !S_ISLNK(mode)) {
> - EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
> + if (test_opt(sb, EXTENTS)) {
> + /* set extent flag only for diretory and file */
> + if (S_ISDIR(mode) || S_ISREG(mode))
> + EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
> ext4_ext_tree_init(handle, inode);
> err = ext4_update_incompat_feature(handle, sb,
> EXT4_FEATURE_INCOMPAT_EXTENTS);
Hm you only set the extents flag for dir & reg, but you call the next
two functions for all files? I think the next 2 lines need to be part
of the conditional, no? (and then there can be just one big test,
indentation can come out a bit...?)
But, the spirit of the patch looks right.
-Eric
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 23902ba..da942bc 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -1771,7 +1771,6 @@ retry:
> #ifdef CONFIG_EXT4DEV_FS_XATTR
> inode->i_op = &ext4_special_inode_operations;
> #endif
> - EXT4_I(inode)->i_flags &= ~EXT4_EXTENTS_FL;
> err = ext4_add_nondir(handle, dentry, inode);
> }
> ext4_journal_stop(handle);
-
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