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-rw-r--r--fs/afs/dir.c21
-rw-r--r--fs/afs/dir_silly.c36
-rw-r--r--fs/afs/inode.c22
-rw-r--r--fs/afs/internal.h17
4 files changed, 80 insertions, 16 deletions
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index cd74731112f4..3e3c2bf0a722 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -696,7 +696,7 @@ static const struct afs_operation_ops afs_inline_bulk_status_operation = {
.success = afs_do_lookup_success,
};
-static const struct afs_operation_ops afs_fetch_status_operation = {
+static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
.issue_afs_rpc = afs_fs_fetch_status,
.issue_yfs_rpc = yfs_fs_fetch_status,
.success = afs_do_lookup_success,
@@ -1496,6 +1496,7 @@ static void afs_unlink_success(struct afs_operation *op)
{
_enter("op=%08x", op->debug_id);
op->ctime = op->file[0].scb.status.mtime_client;
+ afs_check_dir_conflict(op, &op->file[0]);
afs_vnode_commit_status(op, &op->file[0]);
afs_vnode_commit_status(op, &op->file[1]);
afs_update_dentry_version(op, &op->file[0], op->dentry);
@@ -1580,9 +1581,24 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
op->file[1].vnode = vnode;
op->file[1].update_ctime = true;
+ op->file[1].op_unlinked = true;
op->dentry = dentry;
op->ops = &afs_unlink_operation;
- return afs_do_sync_operation(op);
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+
+ /* If there was a conflict with a third party, check the status of the
+ * unlinked vnode.
+ */
+ if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+ op->file[1].update_ctime = false;
+ op->fetch_status.which = 1;
+ op->ops = &afs_fetch_status_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+ }
+
+ return afs_put_operation(op);
error:
return afs_put_operation(op);
@@ -1767,6 +1783,7 @@ static void afs_rename_success(struct afs_operation *op)
_enter("op=%08x", op->debug_id);
op->ctime = op->file[0].scb.status.mtime_client;
+ afs_check_dir_conflict(op, &op->file[1]);
afs_vnode_commit_status(op, &op->file[0]);
if (op->file[1].vnode != op->file[0].vnode) {
op->ctime = op->file[1].scb.status.mtime_client;
diff --git a/fs/afs/dir_silly.c b/fs/afs/dir_silly.c
index 001adb87ff23..04f75a44f243 100644
--- a/fs/afs/dir_silly.c
+++ b/fs/afs/dir_silly.c
@@ -16,6 +16,7 @@ static void afs_silly_rename_success(struct afs_operation *op)
{
_enter("op=%08x", op->debug_id);
+ afs_check_dir_conflict(op, &op->file[0]);
afs_vnode_commit_status(op, &op->file[0]);
}
@@ -69,6 +70,11 @@ static int afs_do_silly_rename(struct afs_vnode *dvnode, struct afs_vnode *vnode
return PTR_ERR(op);
afs_op_set_vnode(op, 0, dvnode);
+ afs_op_set_vnode(op, 1, dvnode);
+ op->file[0].dv_delta = 1;
+ op->file[1].dv_delta = 1;
+ op->file[0].update_ctime = true;
+ op->file[1].update_ctime = true;
op->dentry = old;
op->dentry_2 = new;
@@ -129,6 +135,7 @@ int afs_sillyrename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
switch (ret) {
case 0:
/* The rename succeeded. */
+ set_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags);
d_move(dentry, sdentry);
break;
case -ERESTARTSYS:
@@ -148,18 +155,11 @@ out:
static void afs_silly_unlink_success(struct afs_operation *op)
{
- struct afs_vnode *vnode = op->file[1].vnode;
-
_enter("op=%08x", op->debug_id);
+ afs_check_dir_conflict(op, &op->file[0]);
afs_vnode_commit_status(op, &op->file[0]);
afs_vnode_commit_status(op, &op->file[1]);
afs_update_dentry_version(op, &op->file[0], op->dentry);
-
- drop_nlink(&vnode->vfs_inode);
- if (vnode->vfs_inode.i_nlink == 0) {
- set_bit(AFS_VNODE_DELETED, &vnode->flags);
- clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
- }
}
static void afs_silly_unlink_edit_dir(struct afs_operation *op)
@@ -200,12 +200,30 @@ static int afs_do_silly_unlink(struct afs_vnode *dvnode, struct afs_vnode *vnode
afs_op_set_vnode(op, 0, dvnode);
afs_op_set_vnode(op, 1, vnode);
+ op->file[0].dv_delta = 1;
+ op->file[0].update_ctime = true;
+ op->file[1].op_unlinked = true;
+ op->file[1].update_ctime = true;
op->dentry = dentry;
op->ops = &afs_silly_unlink_operation;
trace_afs_silly_rename(vnode, true);
- return afs_do_sync_operation(op);
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+
+ /* If there was a conflict with a third party, check the status of the
+ * unlinked vnode.
+ */
+ if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+ op->file[1].update_ctime = false;
+ op->fetch_status.which = 1;
+ op->ops = &afs_fetch_status_operation;
+ afs_begin_vnode_operation(op);
+ afs_wait_for_operation(op);
+ }
+
+ return afs_put_operation(op);
}
/*
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index d5d0ae7b2b1e..1d13d2e882ad 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -284,16 +284,25 @@ void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *v
write_seqlock(&vnode->cb_lock);
if (vp->scb.have_error) {
+ /* A YFS server will return this from RemoveFile2 and AFS and
+ * YFS will return this from InlineBulkStatus.
+ */
if (vp->scb.status.abort_code == VNOVNODE) {
set_bit(AFS_VNODE_DELETED, &vnode->flags);
clear_nlink(&vnode->vfs_inode);
__afs_break_callback(vnode, afs_cb_break_for_deleted);
+ op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
}
- } else {
- if (vp->scb.have_status)
- afs_apply_status(op, vp);
+ } else if (vp->scb.have_status) {
+ afs_apply_status(op, vp);
if (vp->scb.have_cb)
afs_apply_callback(op, vp);
+ } else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
+ drop_nlink(&vnode->vfs_inode);
+ if (vnode->vfs_inode.i_nlink == 0) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ __afs_break_callback(vnode, afs_cb_break_for_deleted);
+ }
}
write_sequnlock(&vnode->cb_lock);
@@ -304,7 +313,7 @@ void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *v
static void afs_fetch_status_success(struct afs_operation *op)
{
- struct afs_vnode_param *vp = &op->file[0];
+ struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
struct afs_vnode *vnode = vp->vnode;
int ret;
@@ -318,7 +327,7 @@ static void afs_fetch_status_success(struct afs_operation *op)
}
}
-static const struct afs_operation_ops afs_fetch_status_operation = {
+const struct afs_operation_ops afs_fetch_status_operation = {
.issue_afs_rpc = afs_fs_fetch_status,
.issue_yfs_rpc = yfs_fs_fetch_status,
.success = afs_fetch_status_success,
@@ -729,6 +738,9 @@ int afs_getattr(const struct path *path, struct kstat *stat,
do {
read_seqbegin_or_lock(&vnode->cb_lock, &seq);
generic_fillattr(inode, stat);
+ if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
+ stat->nlink > 0)
+ stat->nlink -= 1;
} while (need_seqretry(&vnode->cb_lock, seq));
done_seqretry(&vnode->cb_lock, seq);
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 9420890e3577..573a5922c3bb 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -634,6 +634,7 @@ struct afs_vnode {
#define AFS_VNODE_AUTOCELL 6 /* set if Vnode is an auto mount point */
#define AFS_VNODE_PSEUDODIR 7 /* set if Vnode is a pseudo directory */
#define AFS_VNODE_NEW_CONTENT 8 /* Set if file has new content (create/trunc-0) */
+#define AFS_VNODE_SILLY_DELETED 9 /* Set if file has been silly-deleted */
struct list_head wb_keys; /* List of keys available for writeback */
struct list_head pending_locks; /* locks waiting to be granted */
@@ -748,6 +749,7 @@ struct afs_vnode_param {
bool need_io_lock:1; /* T if we need the I/O lock on this */
bool update_ctime:1; /* Need to update the ctime */
bool set_size:1; /* Must update i_size */
+ bool op_unlinked:1; /* True if file was unlinked by op */
};
/*
@@ -839,6 +841,7 @@ struct afs_operation {
#define AFS_OPERATION_LOCK_1 0x0200 /* Set if have io_lock on file[1] */
#define AFS_OPERATION_TRIED_ALL 0x0400 /* Set if we've tried all the fileservers */
#define AFS_OPERATION_RETRY_SERVER 0x0800 /* Set if we should retry the current server */
+#define AFS_OPERATION_DIR_CONFLICT 0x1000 /* Set if we detected a 3rd-party dir change */
};
/*
@@ -1066,6 +1069,8 @@ extern int afs_wait_for_one_fs_probe(struct afs_server *, bool);
/*
* inode.c
*/
+extern const struct afs_operation_ops afs_fetch_status_operation;
+
extern void afs_vnode_commit_status(struct afs_operation *, struct afs_vnode_param *);
extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t *);
extern int afs_ilookup5_test_by_fid(struct inode *, void *);
@@ -1497,6 +1502,18 @@ static inline void afs_update_dentry_version(struct afs_operation *op,
(void *)(unsigned long)dir_vp->scb.status.data_version;
}
+/*
+ * Check for a conflicting operation on a directory that we just unlinked from.
+ * If someone managed to sneak a link or an unlink in on the file we just
+ * unlinked, we won't be able to trust nlink on an AFS file (but not YFS).
+ */
+static inline void afs_check_dir_conflict(struct afs_operation *op,
+ struct afs_vnode_param *dvp)
+{
+ if (dvp->dv_before + dvp->dv_delta != dvp->scb.status.data_version)
+ op->flags |= AFS_OPERATION_DIR_CONFLICT;
+}
+
static inline int afs_io_error(struct afs_call *call, enum afs_io_error where)
{
trace_afs_io_error(call->debug_id, -EIO, where);
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-20 05:12:55 +0000