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| author | Christoph Hellwig <hch@lst.de> | 2020-05-23 09:30:14 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2020-06-03 23:16:55 -0400 |
| commit | 45dd052e67ad17c7a24874a783f41aeab15bc294 (patch) | |
| tree | 8babffcf81e916cbe3e5a21b7bace3a040c0e11d /fs/ioctl.c | |
| parent | cddf8a2c4a8286ae60fc866eab59c8bc524e93a0 (diff) | |
| download | linux-stable-45dd052e67ad17c7a24874a783f41aeab15bc294.tar.gz linux-stable-45dd052e67ad17c7a24874a783f41aeab15bc294.tar.bz2 linux-stable-45dd052e67ad17c7a24874a783f41aeab15bc294.zip | |
fs: handle FIEMAP_FLAG_SYNC in fiemap_prep
By moving FIEMAP_FLAG_SYNC handling to fiemap_prep we ensure it is
handled once instead of duplicated, but can still be done under fs locks,
like xfs/iomap intended with its duplicate handling. Also make sure the
error value of filemap_write_and_wait is propagated to user space.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Link: https://lore.kernel.org/r/20200523073016.2944131-8-hch@lst.de
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ioctl.c')
| -rw-r--r-- | fs/ioctl.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/ioctl.c b/fs/ioctl.c index 56bbf02209ae..b16e962340db 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -166,6 +166,7 @@ int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo, { u64 maxbytes = inode->i_sb->s_maxbytes; u32 incompat_flags; + int ret = 0; if (*len == 0) return -EINVAL; @@ -178,13 +179,17 @@ int fiemap_prep(struct inode *inode, struct fiemap_extent_info *fieinfo, if (*len > maxbytes || (maxbytes - *len) < start) *len = maxbytes - start; + supported_flags |= FIEMAP_FLAG_SYNC; supported_flags &= FIEMAP_FLAGS_COMPAT; incompat_flags = fieinfo->fi_flags & ~supported_flags; if (incompat_flags) { fieinfo->fi_flags = incompat_flags; return -EBADR; } - return 0; + + if (fieinfo->fi_flags & FIEMAP_FLAG_SYNC) + ret = filemap_write_and_wait(inode->i_mapping); + return ret; } EXPORT_SYMBOL(fiemap_prep); @@ -213,9 +218,6 @@ static int ioctl_fiemap(struct file *filp, struct fiemap __user *ufiemap) fieinfo.fi_extents_max * sizeof(struct fiemap_extent))) return -EFAULT; - if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC) - filemap_write_and_wait(inode->i_mapping); - error = inode->i_op->fiemap(inode, &fieinfo, fiemap.fm_start, fiemap.fm_length); fiemap.fm_flags = fieinfo.fi_flags; |