[PATCH 11/12] afs: Pass pre-fetch server and volume break counts into afs_iget5_set()

From: David Howells
Date: Wed May 15 2019 - 17:01:38 EST

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Pass the server and volume break counts from before the status fetch
operation that queried the attributes of a file into afs_iget5_set() so
that the new vnode's break counters can be initialised appropriately.

This allows detection of a volume or server break that happened whilst we
were fetching the status or setting up the vnode.

Fixes: c435ee34551e ("afs: Overhaul the callback handling")
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

fs/afs/dir.c | 58 +++++++++++++++++++++++++++++++++++------------------
fs/afs/inode.c | 51 +++++++++++++++++++++++++++--------------------
fs/afs/internal.h | 4 +++-
fs/afs/super.c | 14 +++++++------
4 files changed, 78 insertions(+), 49 deletions(-)

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index d1b3736a3bbd..9e42f6c75747 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -641,7 +641,7 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
struct afs_cb_interest *dcbi, *cbi = NULL;
struct afs_super_info *as = dir->i_sb->s_fs_info;
struct afs_status_cb *scb;
- struct afs_iget_data data;
+ struct afs_iget_data iget_data;
struct afs_fs_cursor fc;
struct afs_server *server;
struct afs_vnode *dvnode = AFS_FS_I(dir);
@@ -684,9 +684,12 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
goto out;

/* Check to see if we already have an inode for the primary fid. */
- data.volume = dvnode->volume;
- data.fid = cookie->fids[0];
- inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data);
+ iget_data.fid = cookie->fids[0];
+ iget_data.volume = dvnode->volume;
+ iget_data.cb_v_break = dvnode->volume->cb_v_break;
+ iget_data.cb_s_break = 0;
+ inode = ilookup5(dir->i_sb, cookie->fids[0].vnode,
+ afs_iget5_test, &iget_data);
if (inode)
goto out;

@@ -713,6 +716,8 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
fc.ac.error = -ECONNABORTED;
break;
}
+ iget_data.cb_v_break = dvnode->volume->cb_v_break;
+ iget_data.cb_s_break = fc.cbi->server->cb_s_break;
afs_fs_inline_bulk_status(&fc,
afs_v2net(dvnode),
cookie->fids,
@@ -741,6 +746,8 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
inode = ERR_PTR(-ERESTARTSYS);
if (afs_begin_vnode_operation(&fc, dvnode, key, true)) {
while (afs_select_fileserver(&fc)) {
+ iget_data.cb_v_break = dvnode->volume->cb_v_break;
+ iget_data.cb_s_break = fc.cbi->server->cb_s_break;
scb = &cookie->statuses[0];
afs_fs_fetch_status(&fc,
afs_v2net(dvnode),
@@ -775,8 +782,8 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
if (scb->status.abort_code != 0)
continue;

- ti = afs_iget(dir->i_sb, key, &cookie->fids[i],
- scb, cbi, dvnode);
+ iget_data.fid = cookie->fids[i];
+ ti = afs_iget(dir->i_sb, key, &iget_data, scb, cbi, dvnode);
if (i == 0) {
inode = ti;
} else {
@@ -1112,7 +1119,7 @@ void afs_d_release(struct dentry *dentry)
*/
static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
struct dentry *new_dentry,
- struct afs_fid *newfid,
+ struct afs_iget_data *new_data,
struct afs_status_cb *new_scb)
{
struct afs_vnode *vnode;
@@ -1122,7 +1129,7 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
return;

inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
- newfid, new_scb, fc->cbi, fc->vnode);
+ new_data, new_scb, fc->cbi, fc->vnode);
if (IS_ERR(inode)) {
/* ENOMEM or EINTR at a really inconvenient time - just abandon
* the new directory on the server.
@@ -1138,15 +1145,23 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
d_instantiate(new_dentry, inode);
}

+static void afs_prep_for_new_inode(struct afs_fs_cursor *fc,
+ struct afs_iget_data *iget_data)
+{
+ iget_data->volume = fc->vnode->volume;
+ iget_data->cb_v_break = fc->vnode->volume->cb_v_break;
+ iget_data->cb_s_break = fc->cbi->server->cb_s_break;
+}
+
/*
* create a directory on an AFS filesystem
*/
static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
+ struct afs_iget_data iget_data;
struct afs_status_cb *scb;
struct afs_fs_cursor fc;
struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct afs_fid newfid;
struct key *key;
int ret;

@@ -1172,14 +1187,15 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)

while (afs_select_fileserver(&fc)) {
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_prep_for_new_inode(&fc, &iget_data);
afs_fs_create(&fc, dentry->d_name.name, mode,
- &scb[0], &newfid, &scb[1]);
+ &scb[0], &iget_data.fid, &scb[1]);
}

afs_check_for_remote_deletion(&fc, dvnode);
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
&data_version, &scb[0]);
- afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]);
+ afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
ret = afs_end_vnode_operation(&fc);
if (ret < 0)
goto error_key;
@@ -1189,7 +1205,7 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)

if (ret == 0 &&
test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
+ afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
afs_edit_dir_for_create);

key_put(key);
@@ -1439,10 +1455,10 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
bool excl)
{
+ struct afs_iget_data iget_data;
struct afs_fs_cursor fc;
struct afs_status_cb *scb;
struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct afs_fid newfid;
struct key *key;
int ret;

@@ -1472,14 +1488,15 @@ static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,

while (afs_select_fileserver(&fc)) {
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_prep_for_new_inode(&fc, &iget_data);
afs_fs_create(&fc, dentry->d_name.name, mode,
- &scb[0], &newfid, &scb[1]);
+ &scb[0], &iget_data.fid, &scb[1]);
}

afs_check_for_remote_deletion(&fc, dvnode);
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
&data_version, &scb[0]);
- afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]);
+ afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
ret = afs_end_vnode_operation(&fc);
if (ret < 0)
goto error_key;
@@ -1488,7 +1505,7 @@ static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
}

if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
+ afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
afs_edit_dir_for_create);

kfree(scb);
@@ -1595,10 +1612,10 @@ static int afs_link(struct dentry *from, struct inode *dir,
static int afs_symlink(struct inode *dir, struct dentry *dentry,
const char *content)
{
+ struct afs_iget_data iget_data;
struct afs_fs_cursor fc;
struct afs_status_cb *scb;
struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct afs_fid newfid;
struct key *key;
int ret;

@@ -1631,14 +1648,15 @@ static int afs_symlink(struct inode *dir, struct dentry *dentry,

while (afs_select_fileserver(&fc)) {
fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_prep_for_new_inode(&fc, &iget_data);
afs_fs_symlink(&fc, dentry->d_name.name, content,
- &scb[0], &newfid, &scb[1]);
+ &scb[0], &iget_data.fid, &scb[1]);
}

afs_check_for_remote_deletion(&fc, dvnode);
afs_vnode_commit_status(&fc, dvnode, fc.cb_break,
&data_version, &scb[0]);
- afs_vnode_new_inode(&fc, dentry, &newfid, &scb[1]);
+ afs_vnode_new_inode(&fc, dentry, &iget_data, &scb[1]);
ret = afs_end_vnode_operation(&fc);
if (ret < 0)
goto error_key;
@@ -1647,7 +1665,7 @@ static int afs_symlink(struct inode *dir, struct dentry *dentry,
}

if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
+ afs_edit_dir_add(dvnode, &dentry->d_name, &iget_data.fid,
afs_edit_dir_for_symlink);

key_put(key);
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 031fe9cb5ccb..70d8c02d69ca 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -346,10 +346,10 @@ int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
*/
int afs_iget5_test(struct inode *inode, void *opaque)
{
- struct afs_iget_data *data = opaque;
+ struct afs_iget_data *iget_data = opaque;
struct afs_vnode *vnode = AFS_FS_I(inode);

- return memcmp(&vnode->fid, &data->fid, sizeof(data->fid)) == 0;
+ return memcmp(&vnode->fid, &iget_data->fid, sizeof(iget_data->fid)) == 0;
}

/*
@@ -367,17 +367,19 @@ static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
*/
static int afs_iget5_set(struct inode *inode, void *opaque)
{
- struct afs_iget_data *data = opaque;
+ struct afs_iget_data *iget_data = opaque;
struct afs_vnode *vnode = AFS_FS_I(inode);

- vnode->fid = data->fid;
- vnode->volume = data->volume;
+ vnode->fid = iget_data->fid;
+ vnode->volume = iget_data->volume;
+ vnode->cb_v_break = iget_data->cb_v_break;
+ vnode->cb_s_break = iget_data->cb_s_break;

/* YFS supports 96-bit vnode IDs, but Linux only supports
* 64-bit inode numbers.
*/
- inode->i_ino = data->fid.vnode;
- inode->i_generation = data->fid.unique;
+ inode->i_ino = iget_data->fid.vnode;
+ inode->i_generation = iget_data->fid.unique;
return 0;
}

@@ -387,38 +389,42 @@ static int afs_iget5_set(struct inode *inode, void *opaque)
*/
struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
{
- struct afs_iget_data data;
struct afs_super_info *as;
struct afs_vnode *vnode;
struct inode *inode;
static atomic_t afs_autocell_ino;

+ struct afs_iget_data iget_data = {
+ .cb_v_break = 0,
+ .cb_s_break = 0,
+ };
+
_enter("");

as = sb->s_fs_info;
if (as->volume) {
- data.volume = as->volume;
- data.fid.vid = as->volume->vid;
+ iget_data.volume = as->volume;
+ iget_data.fid.vid = as->volume->vid;
}
if (root) {
- data.fid.vnode = 1;
- data.fid.unique = 1;
+ iget_data.fid.vnode = 1;
+ iget_data.fid.unique = 1;
} else {
- data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
- data.fid.unique = 0;
+ iget_data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
+ iget_data.fid.unique = 0;
}

- inode = iget5_locked(sb, data.fid.vnode,
+ inode = iget5_locked(sb, iget_data.fid.vnode,
afs_iget5_pseudo_dir_test, afs_iget5_set,
- &data);
+ &iget_data);
if (!inode) {
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}

_debug("GOT INODE %p { ino=%lu, vl=%llx, vn=%llx, u=%x }",
- inode, inode->i_ino, data.fid.vid, data.fid.vnode,
- data.fid.unique);
+ inode, inode->i_ino, iget_data.fid.vid, iget_data.fid.vnode,
+ iget_data.fid.unique);

vnode = AFS_FS_I(inode);

@@ -489,23 +495,24 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
* inode retrieval
*/
struct inode *afs_iget(struct super_block *sb, struct key *key,
- struct afs_fid *fid, struct afs_status_cb *scb,
+ struct afs_iget_data *iget_data,
+ struct afs_status_cb *scb,
struct afs_cb_interest *cbi,
struct afs_vnode *parent_vnode)
{
- struct afs_iget_data data = { .fid = *fid };
struct afs_super_info *as;
struct afs_vnode *vnode;
+ struct afs_fid *fid = &iget_data->fid;
struct inode *inode;
int ret;

_enter(",{%llx:%llu.%u},,", fid->vid, fid->vnode, fid->unique);

as = sb->s_fs_info;
- data.volume = as->volume;
+ iget_data->volume = as->volume;

inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set,
- &data);
+ iget_data);
if (!inode) {
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 1ce3dd9f81e3..9d246ada6ab5 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -66,6 +66,8 @@ struct afs_fs_context {
struct afs_iget_data {
struct afs_fid fid;
struct afs_volume *volume; /* volume on which resides */
+ unsigned int cb_v_break; /* Pre-fetch volume break count */
+ unsigned int cb_s_break; /* Pre-fetch server break count */
};

enum afs_call_state {
@@ -1022,7 +1024,7 @@ extern int afs_fetch_status(struct afs_vnode *, struct key *, bool, afs_access_t
extern int afs_iget5_test(struct inode *, void *);
extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
extern struct inode *afs_iget(struct super_block *, struct key *,
- struct afs_fid *, struct afs_status_cb *,
+ struct afs_iget_data *, struct afs_status_cb *,
struct afs_cb_interest *,
struct afs_vnode *);
extern void afs_zap_data(struct afs_vnode *);
diff --git a/fs/afs/super.c b/fs/afs/super.c
index f76473ad7bbb..f18911e8d770 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -426,7 +426,7 @@ static int afs_set_super(struct super_block *sb, struct fs_context *fc)
static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
{
struct afs_super_info *as = AFS_FS_S(sb);
- struct afs_fid fid;
+ struct afs_iget_data iget_data;
struct inode *inode = NULL;
int ret;

@@ -451,11 +451,13 @@ static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
} else {
sprintf(sb->s_id, "%llu", as->volume->vid);
afs_activate_volume(as->volume);
- fid.vid = as->volume->vid;
- fid.vnode = 1;
- fid.vnode_hi = 0;
- fid.unique = 1;
- inode = afs_iget(sb, ctx->key, &fid, NULL, NULL, NULL);
+ iget_data.fid.vid = as->volume->vid;
+ iget_data.fid.vnode = 1;
+ iget_data.fid.vnode_hi = 0;
+ iget_data.fid.unique = 1;
+ iget_data.cb_v_break = as->volume->cb_v_break;
+ iget_data.cb_s_break = 0;
+ inode = afs_iget(sb, ctx->key, &iget_data, NULL, NULL, NULL);
}

if (IS_ERR(inode))

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