Davide Italiano <dccitaliano@xxxxxxxxx> writes:
> ext4_zero_range() and ext4_collapse_range() duplicate
> the check in ext4_fallocate(). The checks are made with
> inode lock held when there's no need for that. Remove them,
> reducing the scope of the lock.
NAK. Other task can convert indirect<=>extent via
ioctl(, EXT4_IOC_SETFLAGS, flags)
->ext4_ext_migrate()
->ext4_int_migrate()
So we _must_ recheck EXT4_INODE_EXTENTS after we grab i_mutex.
>
> Signed-off-by: Davide Italiano <dccitaliano@xxxxxxxxx>
> ---
> fs/ext4/extents.c | 16 ----------------
> 1 file changed, 16 deletions(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index bed4308..9e6fa09 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -4810,15 +4810,6 @@ static long ext4_zero_range(struct file *file, loff_t offset,
> flags |= EXT4_GET_BLOCKS_KEEP_SIZE;
>
> mutex_lock(&inode->i_mutex);
> -
> - /*
> - * Indirect files do not support unwritten extnets
> - */
> - if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
> - ret = -EOPNOTSUPP;
> - goto out_mutex;
> - }
> -
> if (!(mode & FALLOC_FL_KEEP_SIZE) &&
> offset + len > i_size_read(inode)) {
> new_size = offset + len;
> @@ -5445,13 +5436,6 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
> ret = -EINVAL;
> goto out_mutex;
> }
> -
> - /* Currently just for extent based files */
> - if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
> - ret = -EOPNOTSUPP;
> - goto out_mutex;
> - }
> -
> truncate_pagecache(inode, ioffset);
>
> /* Wait for existing dio to complete */
> --
> 2.3.4
>
> --
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