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fs/ntfs3: Update inode->i_mapping->a_ops on compression state

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Update inode->i_mapping->a_ops when the compression state changes to
ensure correct address space operations.
Clear ATTR_FLAG_SPARSED/FILE_ATTRIBUTE_SPARSE_FILE when enabling
compression to prevent flag conflicts.

v2:
Additionally, ensure that all dirty pages are flushed and concurrent access
to the page cache is blocked.

Fixes: 6b39bfaeec ("fs/ntfs3: Add support for the compression attribute")
Reported-by: Kun Hu <huk23@m.fudan.edu.cn>, Jiaji Qin <jjtan24@m.fudan.edu.cn>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov 2025-01-30 17:03:41 +03:00
parent ff35592644
commit b432163ebd
No known key found for this signature in database
GPG key ID: A9B0331F832407B6
3 changed files with 26 additions and 5 deletions
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3
fs/ntfs3/attrib.c
View file

@ -2664,8 +2664,9 @@ int attr_set_compress(struct ntfs_inode *ni, bool compr)
attr->nres.run_off = cpu_to_le16(run_off);
}
/* Update data attribute flags. */
/* Update attribute flags. */
if (compr) {
attr->flags &= ~ATTR_FLAG_SPARSED;
attr->flags |= ATTR_FLAG_COMPRESSED;
attr->nres.c_unit = NTFS_LZNT_CUNIT;
} else {

22
fs/ntfs3/file.c
View file

@ -101,8 +101,26 @@ int ntfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
/* Allowed to change compression for empty files and for directories only. */
if (!is_dedup(ni) && !is_encrypted(ni) &&
(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) {
/* Change compress state. */
int err = ni_set_compress(inode, flags & FS_COMPR_FL);
int err = 0;
struct address_space *mapping = inode->i_mapping;
/* write out all data and wait. */
filemap_invalidate_lock(mapping);
err = filemap_write_and_wait(mapping);
if (err >= 0) {
/* Change compress state. */
bool compr = flags & FS_COMPR_FL;
err = ni_set_compress(inode, compr);
/* For files change a_ops too. */
if (!err)
mapping->a_ops = compr ? &ntfs_aops_cmpr :
&ntfs_aops;
}
filemap_invalidate_unlock(mapping);
if (err)
return err;
}

6
fs/ntfs3/frecord.c
View file

@ -3434,10 +3434,12 @@ int ni_set_compress(struct inode *inode, bool compr)
}
ni->std_fa = std->fa;
if (compr)
if (compr) {
std->fa &= ~FILE_ATTRIBUTE_SPARSE_FILE;
std->fa |= FILE_ATTRIBUTE_COMPRESSED;
else
} else {
std->fa &= ~FILE_ATTRIBUTE_COMPRESSED;
}
if (ni->std_fa != std->fa) {
ni->std_fa = std->fa;