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authorLinus Torvalds2023-05-02 11:23:08 -0700
committerLinus Torvalds2023-05-02 11:23:08 -0700
commit21d2be646007a1c5461f4233749c368693aa6d9f (patch)
treeadf76e2e0ecaea62d934fc0fdf52f68edd178666
parentd7b3ffe2d7e476f11d73b74093006aa936f59e8b (diff)
parent9ea4eff4b6f4f36546d537a74da44fd3f30903ab (diff)
Merge tag 'afs-fixes-20230502' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
Pull AFS updates from David Howells: "Three fixes to AFS directory handling: - Make sure that afs_read_dir() sees any increase in file size if the file unexpectedly changed on the server (e.g. due to another client making a change). - Make afs_getattr() always return the server's dir file size, not the locally edited one, so that pagecache eviction doesn't cause the dir file size to change unexpectedly. - Prevent afs_read_dir() from getting into an endless loop if the server indicates that the directory file size is larger than expected" * tag 'afs-fixes-20230502' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs: afs: Avoid endless loop if file is larger than expected afs: Fix getattr to report server i_size on dirs, not local size afs: Fix updating of i_size with dv jump from server
-rw-r--r--fs/afs/dir.c4
-rw-r--r--fs/afs/inode.c10
2 files changed, 13 insertions, 1 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index f92b9e62d567..4dd97afa536c 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -275,6 +275,7 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
loff_t i_size;
int nr_pages, i;
int ret;
+ loff_t remote_size = 0;
_enter("");
@@ -289,6 +290,8 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
expand:
i_size = i_size_read(&dvnode->netfs.inode);
+ if (i_size < remote_size)
+ i_size = remote_size;
if (i_size < 2048) {
ret = afs_bad(dvnode, afs_file_error_dir_small);
goto error;
@@ -364,6 +367,7 @@ expand:
* buffer.
*/
up_write(&dvnode->validate_lock);
+ remote_size = req->file_size;
goto expand;
}
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index b1bdffd5e888..866bab860a88 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -230,6 +230,7 @@ static void afs_apply_status(struct afs_operation *op,
set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
}
change_size = true;
+ data_changed = true;
} else if (vnode->status.type == AFS_FTYPE_DIR) {
/* Expected directory change is handled elsewhere so
* that we can locally edit the directory and save on a
@@ -449,7 +450,7 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
0 : FSCACHE_ADV_SINGLE_CHUNK,
&key, sizeof(key),
&aux, sizeof(aux),
- vnode->status.size));
+ i_size_read(&vnode->netfs.inode)));
#endif
}
@@ -776,6 +777,13 @@ int afs_getattr(struct mnt_idmap *idmap, const struct path *path,
if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
stat->nlink > 0)
stat->nlink -= 1;
+
+ /* Lie about the size of directories. We maintain a locally
+ * edited copy and may make different allocation decisions on
+ * it, but we need to give userspace the server's size.
+ */
+ if (S_ISDIR(inode->i_mode))
+ stat->size = vnode->netfs.remote_i_size;
} while (need_seqretry(&vnode->cb_lock, seq));
done_seqretry(&vnode->cb_lock, seq);