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| author | Lorenzo Stoakes <lorenzo.stoakes@oracle.com> | 2025-06-16 20:33:29 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-06-19 13:56:59 +0200 |
| commit | 2e3b37a7e48f8a52fb708cdbeec9d8af0a5af0c1 (patch) | |
| tree | eec595c44d10093de12131c3cac5a0480382501a /fs/ceph | |
| parent | fs: convert most other generic_file_*mmap() users to .mmap_prepare() (diff) | |
| download | linux-2e3b37a7e48f8a52fb708cdbeec9d8af0a5af0c1.tar.gz linux-2e3b37a7e48f8a52fb708cdbeec9d8af0a5af0c1.zip | |
fs: replace mmap hook with .mmap_prepare for simple mappings
Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file
callback"), the f_op->mmap() hook has been deprecated in favour of
f_op->mmap_prepare().
This callback is invoked in the mmap() logic far earlier, so error handling
can be performed more safely without complicated and bug-prone state
unwinding required should an error arise.
This hook also avoids passing a pointer to a not-yet-correctly-established
VMA avoiding any issues with referencing this data structure.
It rather provides a pointer to the new struct vm_area_desc descriptor type
which contains all required state and allows easy setting of required
parameters without any consideration needing to be paid to locking or
reference counts.
Note that nested filesystems like overlayfs are compatible with an
.mmap_prepare() callback since commit bb666b7c2707 ("mm: add mmap_prepare()
compatibility layer for nested file systems").
In this patch we apply this change to file systems with relatively simple
mmap() hook logic - exfat, ceph, f2fs, bcachefs, zonefs, btrfs, ocfs2,
orangefs, nilfs2, romfs, ramfs and aio.
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Link: https://lore.kernel.org/f528ac4f35b9378931bd800920fee53fc0c5c74d.1750099179.git.lorenzo.stoakes@oracle.com
Acked-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Viacheslav Dubeyko <Slava.Dubeyko@ibm.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/addr.c | 6 | ||||
| -rw-r--r-- | fs/ceph/file.c | 2 | ||||
| -rw-r--r-- | fs/ceph/super.h | 2 |
3 files changed, 5 insertions, 5 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 60a621b00c65..3a6459356e70 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -2330,13 +2330,13 @@ static const struct vm_operations_struct ceph_vmops = { .page_mkwrite = ceph_page_mkwrite, }; -int ceph_mmap(struct file *file, struct vm_area_struct *vma) +int ceph_mmap_prepare(struct vm_area_desc *desc) { - struct address_space *mapping = file->f_mapping; + struct address_space *mapping = desc->file->f_mapping; if (!mapping->a_ops->read_folio) return -ENOEXEC; - vma->vm_ops = &ceph_vmops; + desc->vm_ops = &ceph_vmops; return 0; } diff --git a/fs/ceph/file.c b/fs/ceph/file.c index a7254cab44cc..8c06dc4655a8 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -3171,7 +3171,7 @@ const struct file_operations ceph_file_fops = { .llseek = ceph_llseek, .read_iter = ceph_read_iter, .write_iter = ceph_write_iter, - .mmap = ceph_mmap, + .mmap_prepare = ceph_mmap_prepare, .fsync = ceph_fsync, .lock = ceph_lock, .setlease = simple_nosetlease, diff --git a/fs/ceph/super.h b/fs/ceph/super.h index bb0db0cc8003..cf176aab0f82 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -1286,7 +1286,7 @@ extern void __ceph_touch_fmode(struct ceph_inode_info *ci, /* addr.c */ extern const struct address_space_operations ceph_aops; extern const struct netfs_request_ops ceph_netfs_ops; -extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); +int ceph_mmap_prepare(struct vm_area_desc *desc); extern int ceph_uninline_data(struct file *file); extern int ceph_pool_perm_check(struct inode *inode, int need); extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); |