microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
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Merge branch 'for-linus' into work.misc

This commit is contained in:
Al Viro 2016-06-30 23:30:06 -04:00
Родитель ea7d4c046b e06b933e6d
Коммит c074cefcc0
16 изменённых файлов: 184 добавлений и 136 удалений
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2
arch/powerpc/platforms/cell/spufs/coredump.c
Просмотреть файл

@ -172,7 +172,7 @@ static int spufs_arch_write_note(struct spu_context *ctx, int i,
if (rc < 0)
goto out;
skip = roundup(cprm->file->f_pos - total + sz, 4) - cprm->file->f_pos;
skip = roundup(cprm->pos - total + sz, 4) - cprm->pos;
if (!dump_skip(cprm, skip))
goto Eio;
out:

6
fs/9p/vfs_file.c
Просмотреть файл

@ -74,7 +74,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
v9fs_proto_dotu(v9ses));
fid = file->private_data;
if (!fid) {
fid = v9fs_fid_clone(file->f_path.dentry);
fid = v9fs_fid_clone(file_dentry(file));
if (IS_ERR(fid))
return PTR_ERR(fid);
@ -100,7 +100,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
* because we want write after unlink usecase
* to work.
*/
fid = v9fs_writeback_fid(file->f_path.dentry);
fid = v9fs_writeback_fid(file_dentry(file));
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
mutex_unlock(&v9inode->v_mutex);
@ -516,7 +516,7 @@ v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma)
* because we want write after unlink usecase
* to work.
*/
fid = v9fs_writeback_fid(filp->f_path.dentry);
fid = v9fs_writeback_fid(file_dentry(filp));
if (IS_ERR(fid)) {
retval = PTR_ERR(fid);
mutex_unlock(&v9inode->v_mutex);

8
fs/autofs4/autofs_i.h
Просмотреть файл

@ -70,9 +70,13 @@ struct autofs_info {
};
#define AUTOFS_INF_EXPIRING (1<<0) /* dentry in the process of expiring */
#define AUTOFS_INF_NO_RCU (1<<1) /* the dentry is being considered
#define AUTOFS_INF_WANT_EXPIRE (1<<1) /* the dentry is being considered
* for expiry, so RCU_walk is
* not permitted
* not permitted. If it progresses to
* actual expiry attempt, the flag is
* not cleared when EXPIRING is set -
* in that case it gets cleared only
* when it comes to clearing EXPIRING.
*/
#define AUTOFS_INF_PENDING (1<<2) /* dentry pending mount */

27
fs/autofs4/expire.c
Просмотреть файл

@ -316,19 +316,17 @@ struct dentry *autofs4_expire_direct(struct super_block *sb,
if (ino->flags & AUTOFS_INF_PENDING)
goto out;
if (!autofs4_direct_busy(mnt, root, timeout, do_now)) {
ino->flags |= AUTOFS_INF_NO_RCU;
ino->flags |= AUTOFS_INF_WANT_EXPIRE;
spin_unlock(&sbi->fs_lock);
synchronize_rcu();
spin_lock(&sbi->fs_lock);
if (!autofs4_direct_busy(mnt, root, timeout, do_now)) {
ino->flags |= AUTOFS_INF_EXPIRING;
smp_mb();
ino->flags &= ~AUTOFS_INF_NO_RCU;
init_completion(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
return root;
}
ino->flags &= ~AUTOFS_INF_NO_RCU;
ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
}
out:
spin_unlock(&sbi->fs_lock);
@ -446,7 +444,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
while ((dentry = get_next_positive_subdir(dentry, root))) {
spin_lock(&sbi->fs_lock);
ino = autofs4_dentry_ino(dentry);
if (ino->flags & AUTOFS_INF_NO_RCU)
if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
expired = NULL;
else
expired = should_expire(dentry, mnt, timeout, how);
@ -455,7 +453,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
continue;
}
ino = autofs4_dentry_ino(expired);
ino->flags |= AUTOFS_INF_NO_RCU;
ino->flags |= AUTOFS_INF_WANT_EXPIRE;
spin_unlock(&sbi->fs_lock);
synchronize_rcu();
spin_lock(&sbi->fs_lock);
@ -465,7 +463,7 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
goto found;
}
ino->flags &= ~AUTOFS_INF_NO_RCU;
ino->flags &= ~AUTOFS_INF_WANT_EXPIRE;
if (expired != dentry)
dput(expired);
spin_unlock(&sbi->fs_lock);
@ -475,17 +473,8 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb,
found:
pr_debug("returning %p %pd\n", expired, expired);
ino->flags |= AUTOFS_INF_EXPIRING;
smp_mb();
ino->flags &= ~AUTOFS_INF_NO_RCU;
init_completion(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
spin_lock(&sbi->lookup_lock);
spin_lock(&expired->d_parent->d_lock);
spin_lock_nested(&expired->d_lock, DENTRY_D_LOCK_NESTED);
list_move(&expired->d_parent->d_subdirs, &expired->d_child);
spin_unlock(&expired->d_lock);
spin_unlock(&expired->d_parent->d_lock);
spin_unlock(&sbi->lookup_lock);
return expired;
}
@ -496,7 +485,7 @@ int autofs4_expire_wait(struct dentry *dentry, int rcu_walk)
int status;
/* Block on any pending expire */
if (!(ino->flags & (AUTOFS_INF_EXPIRING | AUTOFS_INF_NO_RCU)))
if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE))
return 0;
if (rcu_walk)
return -ECHILD;
@ -554,7 +543,7 @@ int autofs4_expire_run(struct super_block *sb,
ino = autofs4_dentry_ino(dentry);
/* avoid rapid-fire expire attempts if expiry fails */
ino->last_used = now;
ino->flags &= ~AUTOFS_INF_EXPIRING;
ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
complete_all(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
@ -583,7 +572,7 @@ int autofs4_do_expire_multi(struct super_block *sb, struct vfsmount *mnt,
spin_lock(&sbi->fs_lock);
/* avoid rapid-fire expire attempts if expiry fails */
ino->last_used = now;
ino->flags &= ~AUTOFS_INF_EXPIRING;
ino->flags &= ~(AUTOFS_INF_EXPIRING|AUTOFS_INF_WANT_EXPIRE);
complete_all(&ino->expire_complete);
spin_unlock(&sbi->fs_lock);
dput(dentry);

2
fs/autofs4/root.c
Просмотреть файл

@ -458,7 +458,7 @@ static int autofs4_d_manage(struct dentry *dentry, bool rcu_walk)
*/
struct inode *inode;
if (ino->flags & (AUTOFS_INF_EXPIRING | AUTOFS_INF_NO_RCU))
if (ino->flags & AUTOFS_INF_WANT_EXPIRE)
return 0;
if (d_mountpoint(dentry))
return 0;

2
fs/binfmt_elf.c
Просмотреть файл

@ -2275,7 +2275,7 @@ static int elf_core_dump(struct coredump_params *cprm)
goto end_coredump;
/* Align to page */
if (!dump_skip(cprm, dataoff - cprm->file->f_pos))
if (!dump_skip(cprm, dataoff - cprm->pos))
goto end_coredump;
for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;

2
fs/binfmt_elf_fdpic.c
Просмотреть файл

@ -1787,7 +1787,7 @@ static int elf_fdpic_core_dump(struct coredump_params *cprm)
goto end_coredump;
}
if (!dump_skip(cprm, dataoff - cprm->file->f_pos))
if (!dump_skip(cprm, dataoff - cprm->pos))
goto end_coredump;
if (!elf_fdpic_dump_segments(cprm))

10
fs/ceph/export.c
Просмотреть файл

@ -95,10 +95,8 @@ static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
}
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
iput(inode);
if (IS_ERR(dentry))
return dentry;
}
err = ceph_init_dentry(dentry);
if (err < 0) {
dput(dentry);
@ -167,10 +165,8 @@ static struct dentry *__get_parent(struct super_block *sb,
return ERR_PTR(-ENOENT);
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
iput(inode);
if (IS_ERR(dentry))
return dentry;
}
err = ceph_init_dentry(dentry);
if (err < 0) {
dput(dentry);
@ -210,7 +206,7 @@ static struct dentry *ceph_fh_to_parent(struct super_block *sb,
dout("fh_to_parent %llx\n", cfh->parent_ino);
dentry = __get_parent(sb, NULL, cfh->ino);
if (IS_ERR(dentry) && PTR_ERR(dentry) == -ENOENT)
if (unlikely(dentry == ERR_PTR(-ENOENT)))
dentry = __fh_to_dentry(sb, cfh->parent_ino);
return dentry;
}

4
fs/coredump.c
Просмотреть файл

@ -794,6 +794,7 @@ int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
return 0;
file->f_pos = pos;
cprm->written += n;
cprm->pos += n;
nr -= n;
}
return 1;
@ -808,6 +809,7 @@ int dump_skip(struct coredump_params *cprm, size_t nr)
if (dump_interrupted() ||
file->f_op->llseek(file, nr, SEEK_CUR) < 0)
return 0;
cprm->pos += nr;
return 1;
} else {
while (nr > PAGE_SIZE) {
@ -822,7 +824,7 @@ EXPORT_SYMBOL(dump_skip);
int dump_align(struct coredump_params *cprm, int align)
{
unsigned mod = cprm->file->f_pos & (align - 1);
unsigned mod = cprm->pos & (align - 1);
if (align & (align - 1))
return 0;
return mod ? dump_skip(cprm, align - mod) : 1;

79
fs/dcache.c
Просмотреть файл

@ -507,6 +507,44 @@ void d_drop(struct dentry *dentry)
}
EXPORT_SYMBOL(d_drop);
static inline void dentry_unlist(struct dentry *dentry, struct dentry *parent)
{
struct dentry *next;
/*
* Inform d_walk() and shrink_dentry_list() that we are no longer
* attached to the dentry tree
*/
dentry->d_flags |= DCACHE_DENTRY_KILLED;
if (unlikely(list_empty(&dentry->d_child)))
return;
__list_del_entry(&dentry->d_child);
/*
* Cursors can move around the list of children. While we'd been
* a normal list member, it didn't matter - ->d_child.next would've
* been updated. However, from now on it won't be and for the
* things like d_walk() it might end up with a nasty surprise.
* Normally d_walk() doesn't care about cursors moving around -
* ->d_lock on parent prevents that and since a cursor has no children
* of its own, we get through it without ever unlocking the parent.
* There is one exception, though - if we ascend from a child that
* gets killed as soon as we unlock it, the next sibling is found
* using the value left in its ->d_child.next. And if _that_
* pointed to a cursor, and cursor got moved (e.g. by lseek())
* before d_walk() regains parent->d_lock, we'll end up skipping
* everything the cursor had been moved past.
*
* Solution: make sure that the pointer left behind in ->d_child.next
* points to something that won't be moving around. I.e. skip the
* cursors.
*/
while (dentry->d_child.next != &parent->d_subdirs) {
next = list_entry(dentry->d_child.next, struct dentry, d_child);
if (likely(!(next->d_flags & DCACHE_DENTRY_CURSOR)))
break;
dentry->d_child.next = next->d_child.next;
}
}
static void __dentry_kill(struct dentry *dentry)
{
struct dentry *parent = NULL;
@ -532,12 +570,7 @@ static void __dentry_kill(struct dentry *dentry)
}
/* if it was on the hash then remove it */
__d_drop(dentry);
__list_del_entry(&dentry->d_child);
/*
* Inform d_walk() that we are no longer attached to the
* dentry tree
*/
dentry->d_flags |= DCACHE_DENTRY_KILLED;
dentry_unlist(dentry, parent);
if (parent)
spin_unlock(&parent->d_lock);
dentry_iput(dentry);
@ -1203,6 +1236,9 @@ resume:
struct dentry *dentry = list_entry(tmp, struct dentry, d_child);
next = tmp->next;
if (unlikely(dentry->d_flags & DCACHE_DENTRY_CURSOR))
continue;
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
ret = enter(data, dentry);
@ -1636,7 +1672,7 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
struct dentry *dentry = __d_alloc(parent->d_sb, name);
if (!dentry)
return NULL;
dentry->d_flags |= DCACHE_RCUACCESS;
spin_lock(&parent->d_lock);
/*
* don't need child lock because it is not subject
@ -1651,6 +1687,16 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
}
EXPORT_SYMBOL(d_alloc);
struct dentry *d_alloc_cursor(struct dentry * parent)
{
struct dentry *dentry = __d_alloc(parent->d_sb, NULL);
if (dentry) {
dentry->d_flags |= DCACHE_RCUACCESS | DCACHE_DENTRY_CURSOR;
dentry->d_parent = dget(parent);
}
return dentry;
}
/**
* d_alloc_pseudo - allocate a dentry (for lookup-less filesystems)
* @sb: the superblock
@ -2358,7 +2404,6 @@ static void __d_rehash(struct dentry * entry, struct hlist_bl_head *b)
{
BUG_ON(!d_unhashed(entry));
hlist_bl_lock(b);
entry->d_flags |= DCACHE_RCUACCESS;
hlist_bl_add_head_rcu(&entry->d_hash, b);
hlist_bl_unlock(b);
}
@ -2458,7 +2503,6 @@ retry:
rcu_read_unlock();
goto retry;
}
rcu_read_unlock();
/*
* No changes for the parent since the beginning of d_lookup().
* Since all removals from the chain happen with hlist_bl_lock(),
@ -2471,8 +2515,6 @@ retry:
continue;
if (dentry->d_parent != parent)
continue;
if (d_unhashed(dentry))
continue;
if (parent->d_flags & DCACHE_OP_COMPARE) {
int tlen = dentry->d_name.len;
const char *tname = dentry->d_name.name;
@ -2484,9 +2526,18 @@ retry:
if (dentry_cmp(dentry, str, len))
continue;
}
dget(dentry);
hlist_bl_unlock(b);
/* somebody is doing lookup for it right now; wait for it */
/* now we can try to grab a reference */
if (!lockref_get_not_dead(&dentry->d_lockref)) {
rcu_read_unlock();
goto retry;
}
rcu_read_unlock();
/*
* somebody is likely to be still doing lookup for it;
* wait for them to finish
*/
spin_lock(&dentry->d_lock);
d_wait_lookup(dentry);
/*
@ -2517,6 +2568,7 @@ retry:
dput(new);
return dentry;
}
rcu_read_unlock();
/* we can't take ->d_lock here; it's OK, though. */
new->d_flags |= DCACHE_PAR_LOOKUP;
new->d_wait = wq;
@ -2843,6 +2895,7 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
/* ... and switch them in the tree */
if (IS_ROOT(dentry)) {
/* splicing a tree */
dentry->d_flags |= DCACHE_RCUACCESS;
dentry->d_parent = target->d_parent;
target->d_parent = target;
list_del_init(&target->d_child);

1
fs/internal.h
Просмотреть файл

@ -130,6 +130,7 @@ extern int invalidate_inodes(struct super_block *, bool);
extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
extern int d_set_mounted(struct dentry *dentry);
extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
extern struct dentry *d_alloc_cursor(struct dentry *);
/*
* read_write.c

113
fs/libfs.c
Просмотреть файл

@ -71,9 +71,7 @@ EXPORT_SYMBOL(simple_lookup);
int dcache_dir_open(struct inode *inode, struct file *file)
{
static struct qstr cursor_name = QSTR_INIT(".", 1);
file->private_data = d_alloc(file->f_path.dentry, &cursor_name);
file->private_data = d_alloc_cursor(file->f_path.dentry);
return file->private_data ? 0 : -ENOMEM;
}
@ -86,6 +84,61 @@ int dcache_dir_close(struct inode *inode, struct file *file)
}
EXPORT_SYMBOL(dcache_dir_close);
/* parent is locked at least shared */
static struct dentry *next_positive(struct dentry *parent,
struct list_head *from,
int count)
{
unsigned *seq = &parent->d_inode->i_dir_seq, n;
struct dentry *res;
struct list_head *p;
bool skipped;
int i;
retry:
i = count;
skipped = false;
n = smp_load_acquire(seq) & ~1;
res = NULL;
rcu_read_lock();
for (p = from->next; p != &parent->d_subdirs; p = p->next) {
struct dentry *d = list_entry(p, struct dentry, d_child);
if (!simple_positive(d)) {
skipped = true;
} else if (!--i) {
res = d;
break;
}
}
rcu_read_unlock();
if (skipped) {
smp_rmb();
if (unlikely(*seq != n))
goto retry;
}
return res;
}
static void move_cursor(struct dentry *cursor, struct list_head *after)
{
struct dentry *parent = cursor->d_parent;
unsigned n, *seq = &parent->d_inode->i_dir_seq;
spin_lock(&parent->d_lock);
for (;;) {
n = *seq;
if (!(n & 1) && cmpxchg(seq, n, n + 1) == n)
break;
cpu_relax();
}
__list_del(cursor->d_child.prev, cursor->d_child.next);
if (after)
list_add(&cursor->d_child, after);
else
list_add_tail(&cursor->d_child, &parent->d_subdirs);
smp_store_release(seq, n + 2);
spin_unlock(&parent->d_lock);
}
loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
{
struct dentry *dentry = file->f_path.dentry;
@ -101,25 +154,14 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int whence)
if (offset != file->f_pos) {
file->f_pos = offset;
if (file->f_pos >= 2) {
struct list_head *p;
struct dentry *cursor = file->private_data;
struct dentry *to;
loff_t n = file->f_pos - 2;
spin_lock(&dentry->d_lock);
/* d_lock not required for cursor */
list_del(&cursor->d_child);
p = dentry->d_subdirs.next;
while (n && p != &dentry->d_subdirs) {
struct dentry *next;
next = list_entry(p, struct dentry, d_child);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
if (simple_positive(next))
n--;
spin_unlock(&next->d_lock);
p = p->next;
}
list_add_tail(&cursor->d_child, p);
spin_unlock(&dentry->d_lock);
inode_lock_shared(dentry->d_inode);
to = next_positive(dentry, &dentry->d_subdirs, n);
move_cursor(cursor, to ? &to->d_child : NULL);
inode_unlock_shared(dentry->d_inode);
}
}
return offset;
@ -142,36 +184,25 @@ int dcache_readdir(struct file *file, struct dir_context *ctx)
{
struct dentry *dentry = file->f_path.dentry;
struct dentry *cursor = file->private_data;
struct list_head *p, *q = &cursor->d_child;
struct list_head *p = &cursor->d_child;
struct dentry *next;
bool moved = false;
if (!dir_emit_dots(file, ctx))
return 0;
spin_lock(&dentry->d_lock);
if (ctx->pos == 2)
list_move(q, &dentry->d_subdirs);
for (p = q->next; p != &dentry->d_subdirs; p = p->next) {
struct dentry *next = list_entry(p, struct dentry, d_child);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
if (!simple_positive(next)) {
spin_unlock(&next->d_lock);
continue;
}
spin_unlock(&next->d_lock);
spin_unlock(&dentry->d_lock);
p = &dentry->d_subdirs;
while ((next = next_positive(dentry, p, 1)) != NULL) {
if (!dir_emit(ctx, next->d_name.name, next->d_name.len,
d_inode(next)->i_ino, dt_type(d_inode(next))))
return 0;
spin_lock(&dentry->d_lock);
spin_lock_nested(&next->d_lock, DENTRY_D_LOCK_NESTED);
/* next is still alive */
list_move(q, p);
spin_unlock(&next->d_lock);
p = q;
break;
moved = true;
p = &next->d_child;
ctx->pos++;
}
spin_unlock(&dentry->d_lock);
if (moved)
move_cursor(cursor, p);
return 0;
}
EXPORT_SYMBOL(dcache_readdir);

61
fs/namei.c
Просмотреть файл

@ -2995,9 +2995,13 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
}
if (*opened & FILE_CREATED)
fsnotify_create(dir, dentry);
path->dentry = dentry;
path->mnt = nd->path.mnt;
return 1;
if (unlikely(d_is_negative(dentry))) {
error = -ENOENT;
} else {
path->dentry = dentry;
path->mnt = nd->path.mnt;
return 1;
}
}
}
dput(dentry);
@ -3166,9 +3170,7 @@ static int do_last(struct nameidata *nd,
int acc_mode = op->acc_mode;
unsigned seq;
struct inode *inode;
struct path save_parent = { .dentry = NULL, .mnt = NULL };
struct path path;
bool retried = false;
int error;
nd->flags &= ~LOOKUP_PARENT;
@ -3211,7 +3213,6 @@ static int do_last(struct nameidata *nd,
return -EISDIR;
}
retry_lookup:
if (open_flag & (O_CREAT | O_TRUNC | O_WRONLY | O_RDWR)) {
error = mnt_want_write(nd->path.mnt);
if (!error)
@ -3263,6 +3264,10 @@ retry_lookup:
got_write = false;
}
error = follow_managed(&path, nd);
if (unlikely(error < 0))
return error;
if (unlikely(d_is_negative(path.dentry))) {
path_to_nameidata(&path, nd);
return -ENOENT;
@ -3278,10 +3283,6 @@ retry_lookup:
return -EEXIST;
}
error = follow_managed(&path, nd);
if (unlikely(error < 0))
return error;
seq = 0; /* out of RCU mode, so the value doesn't matter */
inode = d_backing_inode(path.dentry);
finish_lookup:
@ -3292,23 +3293,14 @@ finish_lookup:
if (unlikely(error))
return error;
if ((nd->flags & LOOKUP_RCU) || nd->path.mnt != path.mnt) {
path_to_nameidata(&path, nd);
} else {
save_parent.dentry = nd->path.dentry;
save_parent.mnt = mntget(path.mnt);
nd->path.dentry = path.dentry;
}
path_to_nameidata(&path, nd);
nd->inode = inode;
nd->seq = seq;
/* Why this, you ask? _Now_ we might have grown LOOKUP_JUMPED... */
finish_open:
error = complete_walk(nd);
if (error) {
path_put(&save_parent);
if (error)
return error;
}
audit_inode(nd->name, nd->path.dentry, 0);
error = -EISDIR;
if ((open_flag & O_CREAT) && d_is_dir(nd->path.dentry))
@ -3331,13 +3323,9 @@ finish_open_created:
goto out;
BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
error = vfs_open(&nd->path, file, current_cred());
if (!error) {
*opened |= FILE_OPENED;
} else {
if (error == -EOPENSTALE)
goto stale_open;
if (error)
goto out;
}
*opened |= FILE_OPENED;
opened:
error = open_check_o_direct(file);
if (!error)
@ -3353,26 +3341,7 @@ out:
}
if (got_write)
mnt_drop_write(nd->path.mnt);
path_put(&save_parent);
return error;
stale_open:
/* If no saved parent or already retried then can't retry */
if (!save_parent.dentry || retried)
goto out;
BUG_ON(save_parent.dentry != dir);
path_put(&nd->path);
nd->path = save_parent;
nd->inode = dir->d_inode;
save_parent.mnt = NULL;
save_parent.dentry = NULL;
if (got_write) {
mnt_drop_write(nd->path.mnt);
got_write = false;
}
retried = true;
goto retry_lookup;
}
static int do_tmpfile(struct nameidata *nd, unsigned flags,

1
fs/namespace.c
Просмотреть файл

@ -1562,6 +1562,7 @@ void __detach_mounts(struct dentry *dentry)
goto out_unlock;
lock_mount_hash();
event++;
while (!hlist_empty(&mp->m_list)) {
mnt = hlist_entry(mp->m_list.first, struct mount, mnt_mp_list);
if (mnt->mnt.mnt_flags & MNT_UMOUNT) {

1
include/linux/binfmts.h
Просмотреть файл

@ -65,6 +65,7 @@ struct coredump_params {
unsigned long limit;
unsigned long mm_flags;
loff_t written;
loff_t pos;
};
/*

1
include/linux/dcache.h
Просмотреть файл

@ -212,6 +212,7 @@ struct dentry_operations {
#define DCACHE_OP_REAL 0x08000000
#define DCACHE_PAR_LOOKUP 0x10000000 /* being looked up (with parent locked shared) */
#define DCACHE_DENTRY_CURSOR 0x20000000
extern seqlock_t rename_lock;