6.12-stable review patch. If anyone has any objections, please let me know.
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From: Konstantin Komarov almaz.alexandrovich@paragon-software.com
[ Upstream commit b432163ebd15a0fb74051949cb61456d6c55ccbd ]
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: 6b39bfaeec44 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/attrib.c | 3 ++- fs/ntfs3/file.c | 22 ++++++++++++++++++++-- fs/ntfs3/frecord.c | 6 ++++-- 3 files changed, 26 insertions(+), 5 deletions(-)
diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c index da1a9312e61a0..dd459316529e8 100644 --- a/fs/ntfs3/attrib.c +++ b/fs/ntfs3/attrib.c @@ -2663,8 +2663,9 @@ 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 { diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c index f704ceef95394..7976ac4611c8d 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -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; } diff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c index 175662acd5eaf..608634361a302 100644 --- a/fs/ntfs3/frecord.c +++ b/fs/ntfs3/frecord.c @@ -3431,10 +3431,12 @@ 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;