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Merge pull request #103 from versity/zab/verify_dentry_errors

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Zab/verify dentry errors
This commit is contained in:
Zach Brown
2022-10-27 16:15:53 -07:00
committed by GitHub
parent d05489c670 aed4313995
commit 1b924c501e
9 changed files with 220 additions and 277 deletions
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2
kmod/src/counters.h
View File

@@ -75,8 +75,6 @@
EXPAND_COUNTER(data_write_begin_enobufs_retry) \
EXPAND_COUNTER(dentry_revalidate_error) \
EXPAND_COUNTER(dentry_revalidate_invalid) \
EXPAND_COUNTER(dentry_revalidate_locked) \
EXPAND_COUNTER(dentry_revalidate_orphan) \
EXPAND_COUNTER(dentry_revalidate_rcu) \
EXPAND_COUNTER(dentry_revalidate_root) \
EXPAND_COUNTER(dentry_revalidate_valid) \

386
kmod/src/dir.c
View File

@@ -60,8 +60,6 @@
* All the entries have a dirent struct with the full name in their
* value. The dirent struct contains the name hash and readdir position
* so that any item use can reference all the items for a given entry.
* This is important for deleting all the items given a dentry that was
* populated by lookup.
*/
static unsigned int mode_to_type(umode_t mode)
@@ -100,100 +98,12 @@ static unsigned int dentry_type(enum scoutfs_dentry_type type)
return DT_UNKNOWN;
}
/*
* @lock_cov: tells revalidation that the dentry is still locked and valid.
*
* @pos, @hash: lets us remove items on final unlink without having to
* look them up.
*/
struct dentry_info {
struct scoutfs_lock_coverage lock_cov;
u64 hash;
u64 pos;
};
static struct kmem_cache *dentry_info_cache;
static void scoutfs_d_release(struct dentry *dentry)
{
struct super_block *sb = dentry->d_sb;
struct dentry_info *di = dentry->d_fsdata;
if (di) {
scoutfs_lock_del_coverage(sb, &di->lock_cov);
kmem_cache_free(dentry_info_cache, di);
dentry->d_fsdata = NULL;
}
}
static int scoutfs_d_revalidate(struct dentry *dentry, unsigned int flags);
static const struct dentry_operations scoutfs_dentry_ops = {
.d_release = scoutfs_d_release,
const struct dentry_operations scoutfs_dentry_ops = {
.d_revalidate = scoutfs_d_revalidate,
};
static int alloc_dentry_info(struct dentry *dentry)
{
struct dentry_info *di;
smp_rmb();
if (dentry->d_op == &scoutfs_dentry_ops)
return 0;
di = kmem_cache_zalloc(dentry_info_cache, GFP_NOFS);
if (!di)
return -ENOMEM;
scoutfs_lock_init_coverage(&di->lock_cov);
spin_lock(&dentry->d_lock);
if (!dentry->d_fsdata) {
dentry->d_fsdata = di;
smp_wmb();
d_set_d_op(dentry, &scoutfs_dentry_ops);
}
spin_unlock(&dentry->d_lock);
if (di != dentry->d_fsdata)
kmem_cache_free(dentry_info_cache, di);
return 0;
}
static void update_dentry_info(struct super_block *sb, struct dentry *dentry,
u64 hash, u64 pos, struct scoutfs_lock *lock)
{
struct dentry_info *di = dentry->d_fsdata;
if (WARN_ON_ONCE(di == NULL))
return;
scoutfs_lock_add_coverage(sb, lock, &di->lock_cov);
di->hash = hash;
di->pos = pos;
}
static u64 dentry_info_hash(struct dentry *dentry)
{
struct dentry_info *di = dentry->d_fsdata;
if (WARN_ON_ONCE(di == NULL))
return 0;
return di->hash;
}
static u64 dentry_info_pos(struct dentry *dentry)
{
struct dentry_info *di = dentry->d_fsdata;
if (WARN_ON_ONCE(di == NULL))
return 0;
return di->pos;
}
static void init_dirent_key(struct scoutfs_key *key, u8 type, u64 ino,
u64 major, u64 minor)
{
@@ -318,62 +228,105 @@ out:
return ret;
}
/*
* Verify that the caller's dentry still precisely matches our dirent
* items.
*
* The caller has a dentry that the vfs revalidated before they acquired
* their locks. If the dentry is still covered by a lock we immediately
* return 0. If not, we check items and return -ENOENT if a positive
* dentry no longer matches the items or -EEXIST if a negative entry's
* name now has an item.
*/
static int verify_entry(struct super_block *sb, u64 dir_ino, struct dentry *dentry,
struct scoutfs_lock *lock)
static int lookup_dentry_dirent(struct super_block *sb, u64 dir_ino, struct dentry *dentry,
struct scoutfs_dirent *dent_ret,
struct scoutfs_lock *lock)
{
struct dentry_info *di = dentry->d_fsdata;
return lookup_dirent(sb, dir_ino, dentry->d_name.name, dentry->d_name.len,
dirent_name_hash(dentry->d_name.name, dentry->d_name.len),
dent_ret, lock);
}
static u64 dentry_parent_ino(struct dentry *dentry)
{
struct dentry *parent = NULL;
struct inode *dir;
u64 dir_ino = 0;
if ((parent = dget_parent(dentry)) && (dir = parent->d_inode))
dir_ino = scoutfs_ino(dir);
dput(parent);
return dir_ino;
}
/* negative dentries return 0, our root ino is non-zero (1) */
static u64 dentry_ino(struct dentry *dentry)
{
return dentry->d_inode ? scoutfs_ino(dentry->d_inode) : 0;
}
static void set_dentry_fsdata(struct dentry *dentry, struct scoutfs_lock *lock)
{
void *now = (void *)(unsigned long)lock->refresh_gen;
void *was;
/* didn't want to alloc :/ */
BUILD_BUG_ON(sizeof(dentry->d_fsdata) != sizeof(u64));
BUILD_BUG_ON(sizeof(dentry->d_fsdata) != sizeof(long));
do {
was = dentry->d_fsdata;
} while (cmpxchg(&dentry->d_fsdata, was, now) != was);
}
static bool test_dentry_fsdata(struct dentry *dentry, u64 refresh)
{
u64 fsd = (unsigned long)ACCESS_ONCE(dentry->d_fsdata);
return fsd == refresh;
}
/*
* Validate an operation caller's input dentry argument. If the fsdata
* is valid then the underlying dirent items couldn't have changed and
* we return 0. If fsdata is no longer protected by a lock or its
* fields don't match then we check the dirent item. If the dirent item
* doesn't match what the caller expected given their dentry fields then
* we return an error.
*/
static int validate_dentry(struct super_block *sb, u64 dir_ino, struct dentry *dentry,
struct scoutfs_lock *lock)
{
u64 ino = dentry_ino(dentry);
struct scoutfs_dirent dent = {0,};
const char *name;
u64 dentry_ino;
int name_len;
u64 hash;
int ret;
if (scoutfs_lock_is_covered(sb, &di->lock_cov))
return 0;
if (test_dentry_fsdata(dentry, lock->refresh_gen)) {
ret = 0;
goto out;
}
dentry_ino = dentry->d_inode ? scoutfs_ino(dentry->d_inode) : 0;
name = dentry->d_name.name;
name_len = dentry->d_name.len;
hash = dirent_name_hash(name, name_len);
ret = lookup_dirent(sb, dir_ino, name, name_len, hash, &dent, lock);
ret = lookup_dentry_dirent(sb, dir_ino, dentry, &dent, lock);
if (ret < 0 && ret != -ENOENT)
return ret;
goto out;
if (dentry_ino != le64_to_cpu(dent.ino) || di->hash != le64_to_cpu(dent.hash) ||
di->pos != le64_to_cpu(dent.pos)) {
if (dentry_ino)
ret = -ENOENT;
else
ret = -EEXIST;
/* use negative zeroed dent when lookup gave -ENOENT */
if (!ino && dent.ino) {
/* caller expected negative but there was a dirent */
ret = -EEXIST;
} else if (ino && !dent.ino) {
/* caller expected positive but there was no dirent */
ret = -ENOENT;
} else if (ino != le64_to_cpu(dent.ino)) {
/* name linked to different inode than caller's */
ret = -ESTALE;
} else {
/* dirent ino matches dentry ino */
ret = 0;
}
out:
trace_scoutfs_validate_dentry(sb, dentry, dir_ino, ino, le64_to_cpu(dent.ino),
lock->refresh_gen, ret);
return ret;
}
static int scoutfs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
struct super_block *sb = dentry->d_sb;
struct dentry_info *di = dentry->d_fsdata;
struct dentry *parent = dget_parent(dentry);
struct scoutfs_lock *lock = NULL;
struct scoutfs_dirent dent;
bool is_covered = false;
struct inode *dir;
u64 dentry_ino;
u64 dir_ino = dentry_parent_ino(dentry);
int ret;
/* don't think this happens but we can find out */
@@ -395,47 +348,7 @@ static int scoutfs_d_revalidate(struct dentry *dentry, unsigned int flags)
goto out;
}
if (WARN_ON_ONCE(di == NULL)) {
ret = 0;
goto out;
}
is_covered = scoutfs_lock_is_covered(sb, &di->lock_cov);
if (is_covered) {
scoutfs_inc_counter(sb, dentry_revalidate_locked);
ret = 1;
goto out;
}
if (!parent || !parent->d_inode) {
scoutfs_inc_counter(sb, dentry_revalidate_orphan);
ret = 0;
goto out;
}
dir = parent->d_inode;
ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ, 0, dir, &lock);
if (ret)
goto out;
ret = lookup_dirent(sb, scoutfs_ino(dir),
dentry->d_name.name, dentry->d_name.len,
dirent_name_hash(dentry->d_name.name,
dentry->d_name.len),
&dent, lock);
if (ret == -ENOENT) {
dent.ino = 0;
dent.hash = 0;
dent.pos = 0;
} else if (ret < 0) {
goto out;
}
dentry_ino = dentry->d_inode ? scoutfs_ino(dentry->d_inode) : 0;
if ((dentry_ino == le64_to_cpu(dent.ino))) {
update_dentry_info(sb, dentry, le64_to_cpu(dent.hash),
le64_to_cpu(dent.pos), lock);
if (test_dentry_fsdata(dentry, scoutfs_lock_ino_refresh_gen(sb, dir_ino))) {
scoutfs_inc_counter(sb, dentry_revalidate_valid);
ret = 1;
} else {
@@ -444,10 +357,7 @@ static int scoutfs_d_revalidate(struct dentry *dentry, unsigned int flags)
}
out:
trace_scoutfs_d_revalidate(sb, dentry, flags, parent, is_covered, ret);
dput(parent);
scoutfs_unlock(sb, lock, SCOUTFS_LOCK_READ);
trace_scoutfs_d_revalidate(sb, dentry, flags, dir_ino, ret);
if (ret < 0 && ret != -ECHILD)
scoutfs_inc_counter(sb, dentry_revalidate_error);
@@ -484,10 +394,6 @@ static struct dentry *scoutfs_lookup(struct inode *dir, struct dentry *dentry,
goto out;
}
ret = alloc_dentry_info(dentry);
if (ret)
goto out;
ret = scoutfs_lock_inode(sb, SCOUTFS_LOCK_READ, 0, dir, &dir_lock);
if (ret)
goto out;
@@ -501,8 +407,7 @@ static struct dentry *scoutfs_lookup(struct inode *dir, struct dentry *dentry,
ino = le64_to_cpu(dent.ino);
}
if (ret == 0)
update_dentry_info(sb, dentry, le64_to_cpu(dent.hash),
le64_to_cpu(dent.pos), dir_lock);
set_dentry_fsdata(dentry, dir_lock);
scoutfs_unlock(sb, dir_lock, SCOUTFS_LOCK_READ);
@@ -726,10 +631,6 @@ static struct inode *lock_hold_create(struct inode *dir, struct dentry *dentry,
int ret = 0;
u64 ino;
ret = alloc_dentry_info(dentry);
if (ret)
return ERR_PTR(ret);
ret = scoutfs_alloc_ino(sb, S_ISDIR(mode), &ino);
if (ret)
return ERR_PTR(ret);
@@ -818,7 +719,7 @@ static int scoutfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
return PTR_ERR(inode);
si = SCOUTFS_I(inode);
ret = verify_entry(sb, scoutfs_ino(dir), dentry, dir_lock);
ret = validate_dentry(sb, scoutfs_ino(dir), dentry, dir_lock);
if (ret < 0)
goto out;
@@ -831,7 +732,7 @@ static int scoutfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
if (ret)
goto out;
update_dentry_info(sb, dentry, hash, pos, dir_lock);
set_dentry_fsdata(dentry, dir_lock);
i_size_write(dir, i_size_read(dir) + dentry->d_name.len);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
@@ -905,19 +806,15 @@ static int scoutfs_link(struct dentry *old_dentry,
if (ret)
return ret;
ret = validate_dentry(sb, scoutfs_ino(dir), dentry, dir_lock);
if (ret < 0)
goto out_unlock;
if (inode->i_nlink >= SCOUTFS_LINK_MAX) {
ret = -EMLINK;
goto out_unlock;
}
ret = alloc_dentry_info(dentry);
if (ret)
goto out_unlock;
ret = verify_entry(sb, scoutfs_ino(dir), dentry, dir_lock);
if (ret < 0)
goto out_unlock;
dir_size = i_size_read(dir) + dentry->d_name.len;
if (inode->i_nlink == 0) {
@@ -959,7 +856,7 @@ retry:
WARN_ON_ONCE(err); /* no orphan, might not scan and delete after crash */
goto out;
}
update_dentry_info(sb, dentry, hash, pos, dir_lock);
set_dentry_fsdata(dentry, dir_lock);
i_size_write(dir, dir_size);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
@@ -1007,9 +904,11 @@ static int scoutfs_unlink(struct inode *dir, struct dentry *dentry)
struct scoutfs_lock *inode_lock = NULL;
struct scoutfs_lock *orph_lock = NULL;
struct scoutfs_lock *dir_lock = NULL;
struct scoutfs_dirent dent;
LIST_HEAD(ind_locks);
u64 ind_seq;
int ret = 0;
u64 hash;
int ret;
ret = scoutfs_lock_inodes(sb, SCOUTFS_LOCK_WRITE,
SCOUTFS_LKF_REFRESH_INODE,
@@ -1018,11 +917,7 @@ static int scoutfs_unlink(struct inode *dir, struct dentry *dentry)
if (ret)
return ret;
ret = alloc_dentry_info(dentry);
if (ret)
goto unlock;
ret = verify_entry(sb, scoutfs_ino(dir), dentry, dir_lock);
ret = validate_dentry(sb, scoutfs_ino(dir), dentry, dir_lock);
if (ret < 0)
goto unlock;
@@ -1031,6 +926,13 @@ static int scoutfs_unlink(struct inode *dir, struct dentry *dentry)
goto unlock;
}
hash = dirent_name_hash(dentry->d_name.name, dentry->d_name.len);
ret = lookup_dirent(sb, scoutfs_ino(dir), dentry->d_name.name, dentry->d_name.len, hash,
&dent, dir_lock);
if (ret < 0)
goto out;
if (should_orphan(inode)) {
ret = scoutfs_lock_orphan(sb, SCOUTFS_LOCK_WRITE_ONLY, 0, scoutfs_ino(inode),
&orph_lock);
@@ -1054,16 +956,15 @@ retry:
goto out;
}
ret = del_entry_items(sb, scoutfs_ino(dir), dentry_info_hash(dentry),
dentry_info_pos(dentry), scoutfs_ino(inode),
dir_lock, inode_lock);
ret = del_entry_items(sb, scoutfs_ino(dir), le64_to_cpu(dent.hash), le64_to_cpu(dent.pos),
scoutfs_ino(inode), dir_lock, inode_lock);
if (ret) {
ret = scoutfs_inode_orphan_delete(sb, scoutfs_ino(inode), orph_lock);
WARN_ON_ONCE(ret); /* should have been dirty */
goto out;
}
update_dentry_info(sb, dentry, 0, 0, dir_lock);
set_dentry_fsdata(dentry, dir_lock);
dir->i_ctime = ts;
dir->i_mtime = ts;
@@ -1276,17 +1177,13 @@ static int scoutfs_symlink(struct inode *dir, struct dentry *dentry,
name_len > PATH_MAX || name_len > SCOUTFS_SYMLINK_MAX_SIZE)
return -ENAMETOOLONG;
ret = alloc_dentry_info(dentry);
if (ret)
return ret;
inode = lock_hold_create(dir, dentry, S_IFLNK|S_IRWXUGO, 0,
&dir_lock, &inode_lock, NULL, &ind_locks);
if (IS_ERR(inode))
return PTR_ERR(inode);
si = SCOUTFS_I(inode);
ret = verify_entry(sb, scoutfs_ino(dir), dentry, dir_lock);
ret = validate_dentry(sb, scoutfs_ino(dir), dentry, dir_lock);
if (ret < 0)
goto out;
@@ -1304,7 +1201,7 @@ static int scoutfs_symlink(struct inode *dir, struct dentry *dentry,
if (ret)
goto out;
update_dentry_info(sb, dentry, hash, pos, dir_lock);
set_dentry_fsdata(dentry, dir_lock);
i_size_write(dir, i_size_read(dir) + dentry->d_name.len);
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
@@ -1634,6 +1531,8 @@ static int scoutfs_rename_common(struct inode *old_dir,
struct scoutfs_lock *old_inode_lock = NULL;
struct scoutfs_lock *new_inode_lock = NULL;
struct scoutfs_lock *orph_lock = NULL;
struct scoutfs_dirent new_dent;
struct scoutfs_dirent old_dent;
struct timespec now;
bool ins_new = false;
bool del_new = false;
@@ -1681,19 +1580,18 @@ static int scoutfs_rename_common(struct inode *old_dir,
if (ret)
goto out_unlock;
/* make sure that the entries assumed by the argument still exist */
ret = validate_dentry(sb, scoutfs_ino(old_dir), old_dentry, old_dir_lock) ?:
validate_dentry(sb, scoutfs_ino(new_dir), new_dentry, new_dir_lock);
if (ret)
goto out_unlock;
/* test dir i_size now that it's refreshed */
if (new_inode && S_ISDIR(new_inode->i_mode) && i_size_read(new_inode)) {
ret = -ENOTEMPTY;
goto out_unlock;
}
/* make sure that the entries assumed by the argument still exist */
ret = alloc_dentry_info(old_dentry) ?:
alloc_dentry_info(new_dentry) ?:
verify_entry(sb, scoutfs_ino(old_dir), old_dentry, old_dir_lock) ?:
verify_entry(sb, scoutfs_ino(new_dir), new_dentry, new_dir_lock);
if (ret)
goto out_unlock;
if ((flags & RENAME_NOREPLACE) && (new_inode != NULL)) {
ret = -EEXIST;
@@ -1736,10 +1634,12 @@ retry:
/* remove the new entry if it exists */
if (new_inode) {
ret = del_entry_items(sb, scoutfs_ino(new_dir),
dentry_info_hash(new_dentry),
dentry_info_pos(new_dentry),
scoutfs_ino(new_inode),
ret = lookup_dirent(sb, scoutfs_ino(new_dir), new_dentry->d_name.name,
new_dentry->d_name.len, new_hash, &new_dent, new_dir_lock);
if (ret < 0)
goto out;
ret = del_entry_items(sb, scoutfs_ino(new_dir), le64_to_cpu(new_dent.hash),
le64_to_cpu(new_dent.pos), scoutfs_ino(new_inode),
new_dir_lock, new_inode_lock);
if (ret)
goto out;
@@ -1755,11 +1655,14 @@ retry:
goto out;
del_new = true;
ret = lookup_dirent(sb, scoutfs_ino(old_dir), old_dentry->d_name.name,
old_dentry->d_name.len, old_hash, &old_dent, old_dir_lock);
if (ret < 0)
goto out;
/* remove the old entry */
ret = del_entry_items(sb, scoutfs_ino(old_dir),
dentry_info_hash(old_dentry),
dentry_info_pos(old_dentry),
scoutfs_ino(old_inode),
ret = del_entry_items(sb, scoutfs_ino(old_dir), le64_to_cpu(old_dent.hash),
le64_to_cpu(old_dent.pos), scoutfs_ino(old_inode),
old_dir_lock, old_inode_lock);
if (ret)
goto out;
@@ -1774,7 +1677,7 @@ retry:
/* won't fail from here on out, update all the vfs structs */
/* the caller will use d_move to move the old_dentry into place */
update_dentry_info(sb, old_dentry, new_hash, new_pos, new_dir_lock);
set_dentry_fsdata(old_dentry, new_dir_lock);
i_size_write(old_dir, i_size_read(old_dir) - old_dentry->d_name.len);
if (!new_inode)
@@ -1839,8 +1742,8 @@ out:
err = 0;
if (ins_old)
err = add_entry_items(sb, scoutfs_ino(old_dir),
dentry_info_hash(old_dentry),
dentry_info_pos(old_dentry),
le64_to_cpu(old_dent.hash),
le64_to_cpu(old_dent.pos),
old_dentry->d_name.name,
old_dentry->d_name.len,
scoutfs_ino(old_inode),
@@ -1856,8 +1759,8 @@ out:
if (ins_new && err == 0)
err = add_entry_items(sb, scoutfs_ino(new_dir),
dentry_info_hash(new_dentry),
dentry_info_pos(new_dentry),
le64_to_cpu(new_dent.hash),
le64_to_cpu(new_dent.pos),
new_dentry->d_name.name,
new_dentry->d_name.len,
scoutfs_ino(new_inode),
@@ -1992,22 +1895,3 @@ const struct inode_operations_wrapper scoutfs_dir_iops = {
.tmpfile = scoutfs_tmpfile,
.rename2 = scoutfs_rename2,
};
void scoutfs_dir_exit(void)
{
if (dentry_info_cache) {
kmem_cache_destroy(dentry_info_cache);
dentry_info_cache = NULL;
}
}
int scoutfs_dir_init(void)
{
dentry_info_cache = kmem_cache_create("scoutfs_dentry_info",
sizeof(struct dentry_info), 0,
SLAB_RECLAIM_ACCOUNT, NULL);
if (!dentry_info_cache)
return -ENOMEM;
return 0;
}

5
kmod/src/dir.h
View File

@@ -8,6 +8,8 @@ extern const struct file_operations scoutfs_dir_fops;
extern const struct inode_operations_wrapper scoutfs_dir_iops;
extern const struct inode_operations scoutfs_symlink_iops;
extern const struct dentry_operations scoutfs_dentry_ops;
struct scoutfs_link_backref_entry {
struct list_head head;
u64 dir_ino;
@@ -29,7 +31,4 @@ int scoutfs_dir_add_next_linkref(struct super_block *sb, u64 ino,
int scoutfs_symlink_drop(struct super_block *sb, u64 ino,
struct scoutfs_lock *lock, u64 i_size);
int scoutfs_dir_init(void);
void scoutfs_dir_exit(void);
#endif

32
kmod/src/lock.c
View File

@@ -1528,6 +1528,38 @@ void scoutfs_lock_flush_invalidate(struct super_block *sb)
flush_work(&linfo->inv_work);
}
static u64 get_held_lock_refresh_gen(struct super_block *sb, struct scoutfs_key *start)
{
DECLARE_LOCK_INFO(sb, linfo);
struct scoutfs_lock *lock;
u64 refresh_gen = 0;
/* this can be called from all manner of places */
if (!linfo)
return 0;
spin_lock(&linfo->lock);
lock = lock_lookup(sb, start, NULL);
if (lock) {
if (lock_mode_can_read(lock->mode))
refresh_gen = lock->refresh_gen;
}
spin_unlock(&linfo->lock);
return refresh_gen;
}
u64 scoutfs_lock_ino_refresh_gen(struct super_block *sb, u64 ino)
{
struct scoutfs_key start;
scoutfs_key_set_zeros(&start);
start.sk_zone = SCOUTFS_FS_ZONE;
start.ski_ino = cpu_to_le64(ino & ~(u64)SCOUTFS_LOCK_INODE_GROUP_MASK);
return get_held_lock_refresh_gen(sb, &start);
}
/*
* The caller is going to be shutting down transactions and the client.
* We need to make sure that locking won't call either after we return.

2
kmod/src/lock.h
View File

@@ -100,6 +100,8 @@ void scoutfs_lock_del_coverage(struct super_block *sb,
bool scoutfs_lock_protected(struct scoutfs_lock *lock, struct scoutfs_key *key,
enum scoutfs_lock_mode mode);
u64 scoutfs_lock_ino_refresh_gen(struct super_block *sb, u64 ino);
void scoutfs_free_unused_locks(struct super_block *sb);
int scoutfs_lock_setup(struct super_block *sb);

63
kmod/src/scoutfs_trace.h
View File

@@ -1417,42 +1417,71 @@ TRACE_EVENT(scoutfs_rename,
);
TRACE_EVENT(scoutfs_d_revalidate,
TP_PROTO(struct super_block *sb,
struct dentry *dentry, int flags, struct dentry *parent,
bool is_covered, int ret),
TP_PROTO(struct super_block *sb, struct dentry *dentry, int flags, u64 dir_ino, int ret),
TP_ARGS(sb, dentry, flags, parent, is_covered, ret),
TP_ARGS(sb, dentry, flags, dir_ino, ret),
TP_STRUCT__entry(
SCSB_TRACE_FIELDS
__field(void *, dentry)
__string(name, dentry->d_name.name)
__field(__u64, ino)
__field(__u64, parent_ino)
__field(__u64, dir_ino)
__field(int, flags)
__field(int, is_root)
__field(int, is_covered)
__field(int, ret)
),
TP_fast_assign(
SCSB_TRACE_ASSIGN(sb);
__entry->dentry = dentry;
__assign_str(name, dentry->d_name.name)
__entry->ino = dentry->d_inode ?
scoutfs_ino(dentry->d_inode) : 0;
__entry->parent_ino = parent->d_inode ?
scoutfs_ino(parent->d_inode) : 0;
__entry->ino = dentry->d_inode ? scoutfs_ino(dentry->d_inode) : 0;
__entry->dir_ino = dir_ino;
__entry->flags = flags;
__entry->is_root = IS_ROOT(dentry);
__entry->is_covered = is_covered;
__entry->ret = ret;
),
TP_printk(SCSBF" name %s ino %llu parent_ino %llu flags 0x%x s_root %u is_covered %u ret %d",
SCSB_TRACE_ARGS, __get_str(name), __entry->ino,
__entry->parent_ino, __entry->flags,
__entry->is_root,
__entry->is_covered,
__entry->ret)
TP_printk(SCSBF" dentry %p name %s ino %llu dir_ino %llu flags 0x%x s_root %u ret %d",
SCSB_TRACE_ARGS, __entry->dentry, __get_str(name), __entry->ino, __entry->dir_ino,
__entry->flags, __entry->is_root, __entry->ret)
);
TRACE_EVENT(scoutfs_validate_dentry,
TP_PROTO(struct super_block *sb, struct dentry *dentry, u64 dir_ino, u64 dentry_ino,
u64 dent_ino, u64 refresh_gen, int ret),
TP_ARGS(sb, dentry, dir_ino, dentry_ino, dent_ino, refresh_gen, ret),
TP_STRUCT__entry(
SCSB_TRACE_FIELDS
__field(void *, dentry)
__field(__u64, dir_ino)
__string(name, dentry->d_name.name)
__field(__u64, dentry_ino)
__field(__u64, dent_ino)
__field(__u64, fsdata_gen)
__field(__u64, refresh_gen)
__field(int, ret)
),
TP_fast_assign(
SCSB_TRACE_ASSIGN(sb);
__entry->dentry = dentry;
__entry->dir_ino = dir_ino;
__assign_str(name, dentry->d_name.name)
__entry->dentry_ino = dentry_ino;
__entry->dent_ino = dent_ino;
__entry->fsdata_gen = (unsigned long long)dentry->d_fsdata;
__entry->refresh_gen = refresh_gen;
__entry->ret = ret;
),
TP_printk(SCSBF" dentry %p dir %llu name %s dentry_ino %llu dent_ino %llu fsdata_gen %llu refresh_gen %llu ret %d",
SCSB_TRACE_ARGS, __entry->dentry, __entry->dir_ino, __get_str(name),
__entry->dentry_ino, __entry->dent_ino, __entry->fsdata_gen,
__entry->refresh_gen, __entry->ret)
);
DECLARE_EVENT_CLASS(scoutfs_super_lifecycle_class,

3
kmod/src/super.c
View File

@@ -483,6 +483,7 @@ static int scoutfs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_magic = SCOUTFS_SUPER_MAGIC;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_op = &scoutfs_super_ops;
sb->s_d_op = &scoutfs_dentry_ops;
sb->s_export_op = &scoutfs_export_ops;
sb->s_xattr = scoutfs_xattr_handlers;
sb->s_flags |= MS_I_VERSION | MS_POSIXACL;
@@ -630,7 +631,6 @@ MODULE_ALIAS_FS("scoutfs");
static void teardown_module(void)
{
debugfs_remove(scoutfs_debugfs_root);
scoutfs_dir_exit();
scoutfs_inode_exit();
scoutfs_sysfs_exit();
}
@@ -668,7 +668,6 @@ static int __init scoutfs_module_init(void)
goto out;
}
ret = scoutfs_inode_init() ?:
scoutfs_dir_init() ?:
register_filesystem(&scoutfs_fs_type);
out:
if (ret)

2
kmod/src/sysfs.c
View File

@@ -268,7 +268,7 @@ int __init scoutfs_sysfs_init(void)
return 0;
}
void __exit scoutfs_sysfs_exit(void)
void scoutfs_sysfs_exit(void)
{
if (scoutfs_kset)
kset_unregister(scoutfs_kset);

2
kmod/src/sysfs.h
View File

@@ -53,6 +53,6 @@ int scoutfs_setup_sysfs(struct super_block *sb);
void scoutfs_destroy_sysfs(struct super_block *sb);
int __init scoutfs_sysfs_init(void);
void __exit scoutfs_sysfs_exit(void);
void scoutfs_sysfs_exit(void);
#endif