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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

Browse source 
* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  kill I_LOCK
  fold do_sync_file_range into sys_sync_file_range
  fix up O_SYNC comments
  VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size
  fsstack/ecryptfs: remove unused get_nlinks param to fsstack_copy_attr_all
  vfs: remove extraneous NULL d_inode check from do_filp_open
  fs: no games with DCACHE_UNHASHED
  fs: anon_inodes implement dname
  dio: fix use-after-free
This commit is contained in:
Linus Torvalds 2009-12-17 08:31:01 -08:00
commit b8a7f3cd7e
24 changed files with 136 additions and 163 deletions
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2
arch/alpha/include/asm/fcntl.h
View file

@ -16,7 +16,7 @@
#define O_NOATIME 04000000
#define O_CLOEXEC 010000000 /* set close_on_exec */
/*
* Before Linux 2.6.32 only O_DSYNC semantics were implemented, but using
* Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
* the O_SYNC flag. We continue to use the existing numerical value
* for O_DSYNC semantics now, but using the correct symbolic name for it.
* This new value is used to request true Posix O_SYNC semantics. It is

2
arch/mips/include/asm/fcntl.h
View file

@ -19,7 +19,7 @@
#define FASYNC 0x1000 /* fcntl, for BSD compatibility */
#define O_LARGEFILE 0x2000 /* allow large file opens */
/*
* Before Linux 2.6.32 only O_DSYNC semantics were implemented, but using
* Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
* the O_SYNC flag. We continue to use the existing numerical value
* for O_DSYNC semantics now, but using the correct symbolic name for it.
* This new value is used to request true Posix O_SYNC semantics. It is

2
arch/sparc/include/asm/fcntl.h
View file

@ -19,7 +19,7 @@
#define O_NOATIME 0x200000
#define O_CLOEXEC 0x400000
/*
* Before Linux 2.6.32 only O_DSYNC semantics were implemented, but using
* Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
* the O_SYNC flag. We continue to use the existing numerical value
* for O_DSYNC semantics now, but using the correct symbolic name for it.
* This new value is used to request true Posix O_SYNC semantics. It is

17
fs/anon_inodes.c
View file

@ -35,14 +35,13 @@ static int anon_inodefs_get_sb(struct file_system_type *fs_type, int flags,
mnt);
}
static int anon_inodefs_delete_dentry(struct dentry *dentry)
/*
* anon_inodefs_dname() is called from d_path().
*/
static char *anon_inodefs_dname(struct dentry *dentry, char *buffer, int buflen)
{
/*
* We faked vfs to believe the dentry was hashed when we created it.
* Now we restore the flag so that dput() will work correctly.
*/
dentry->d_flags |= DCACHE_UNHASHED;
return 1;
return dynamic_dname(dentry, buffer, buflen, "anon_inode:%s",
dentry->d_name.name);
}
static struct file_system_type anon_inode_fs_type = {
@ -51,7 +50,7 @@ static struct file_system_type anon_inode_fs_type = {
.kill_sb = kill_anon_super,
};
static const struct dentry_operations anon_inodefs_dentry_operations = {
.d_delete = anon_inodefs_delete_dentry,
.d_dname = anon_inodefs_dname,
};
/*
@ -119,8 +118,6 @@ struct file *anon_inode_getfile(const char *name,
atomic_inc(&anon_inode_inode->i_count);
path.dentry->d_op = &anon_inodefs_dentry_operations;
/* Do not publish this dentry inside the global dentry hash table */
path.dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(path.dentry, anon_inode_inode);
error = -ENFILE;

2
fs/direct-io.c
View file

@ -1206,7 +1206,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
* NOTE: filesystems with their own locking have to handle this
* on their own.
*/
if (dio->flags & DIO_LOCKING) {
if (flags & DIO_LOCKING) {
if (unlikely((rw & WRITE) && retval < 0)) {
loff_t isize = i_size_read(inode);
if (end > isize)

2
fs/ecryptfs/dentry.c
View file

@ -62,7 +62,7 @@ static int ecryptfs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
struct inode *lower_inode =
ecryptfs_inode_to_lower(dentry->d_inode);
fsstack_copy_attr_all(dentry->d_inode, lower_inode, NULL);
fsstack_copy_attr_all(dentry->d_inode, lower_inode);
}
out:
return rc;

6
fs/ecryptfs/inode.c
View file

@ -626,9 +626,9 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
lower_new_dir_dentry->d_inode, lower_new_dentry);
if (rc)
goto out_lock;
fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode, NULL);
fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
if (new_dir != old_dir)
fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode, NULL);
fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
out_lock:
unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
dput(lower_new_dentry->d_parent);
@ -967,7 +967,7 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
rc = notify_change(lower_dentry, ia);
mutex_unlock(&lower_dentry->d_inode->i_mutex);
out:
fsstack_copy_attr_all(inode, lower_inode, NULL);
fsstack_copy_attr_all(inode, lower_inode);
return rc;
}

2
fs/ecryptfs/main.c
View file

@ -189,7 +189,7 @@ int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
init_special_inode(inode, lower_inode->i_mode,
lower_inode->i_rdev);
dentry->d_op = &ecryptfs_dops;
fsstack_copy_attr_all(inode, lower_inode, NULL);
fsstack_copy_attr_all(inode, lower_inode);
/* This size will be overwritten for real files w/ headers and
* other metadata */
fsstack_copy_inode_size(inode, lower_inode);

2
fs/gfs2/inode.c
View file

@ -125,7 +125,7 @@ static struct inode *gfs2_iget_skip(struct super_block *sb,
* directory entry when gfs2_inode_lookup() is invoked. Part of the code
* segment inside gfs2_inode_lookup code needs to get moved around.
*
* Clean up I_LOCK and I_NEW as well.
* Clears I_NEW as well.
**/
void gfs2_set_iop(struct inode *inode)

26
fs/inode.c
View file

@ -113,7 +113,7 @@ static void wake_up_inode(struct inode *inode)
* Prevent speculative execution through spin_unlock(&inode_lock);
*/
smp_mb();
wake_up_bit(&inode->i_state, __I_LOCK);
wake_up_bit(&inode->i_state, __I_NEW);
}
/**
@ -690,17 +690,17 @@ void unlock_new_inode(struct inode *inode)
}
#endif
/*
* This is special! We do not need the spinlock when clearing I_LOCK,
* This is special! We do not need the spinlock when clearing I_NEW,
* because we're guaranteed that nobody else tries to do anything about
* the state of the inode when it is locked, as we just created it (so
* there can be no old holders that haven't tested I_LOCK).
* there can be no old holders that haven't tested I_NEW).
* However we must emit the memory barrier so that other CPUs reliably
* see the clearing of I_LOCK after the other inode initialisation has
* see the clearing of I_NEW after the other inode initialisation has
* completed.
*/
smp_mb();
WARN_ON((inode->i_state & (I_LOCK|I_NEW)) != (I_LOCK|I_NEW));
inode->i_state &= ~(I_LOCK|I_NEW);
WARN_ON(!(inode->i_state & I_NEW));
inode->i_state &= ~I_NEW;
wake_up_inode(inode);
}
EXPORT_SYMBOL(unlock_new_inode);
@ -731,7 +731,7 @@ static struct inode *get_new_inode(struct super_block *sb,
goto set_failed;
__inode_add_to_lists(sb, head, inode);
inode->i_state = I_LOCK|I_NEW;
inode->i_state = I_NEW;
spin_unlock(&inode_lock);
/* Return the locked inode with I_NEW set, the
@ -778,7 +778,7 @@ static struct inode *get_new_inode_fast(struct super_block *sb,
if (!old) {
inode->i_ino = ino;
__inode_add_to_lists(sb, head, inode);
inode->i_state = I_LOCK|I_NEW;
inode->i_state = I_NEW;
spin_unlock(&inode_lock);
/* Return the locked inode with I_NEW set, the
@ -1083,7 +1083,7 @@ int insert_inode_locked(struct inode *inode)
ino_t ino = inode->i_ino;
struct hlist_head *head = inode_hashtable + hash(sb, ino);
inode->i_state |= I_LOCK|I_NEW;
inode->i_state |= I_NEW;
while (1) {
struct hlist_node *node;
struct inode *old = NULL;
@ -1120,7 +1120,7 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
struct super_block *sb = inode->i_sb;
struct hlist_head *head = inode_hashtable + hash(sb, hashval);
inode->i_state |= I_LOCK|I_NEW;
inode->i_state |= I_NEW;
while (1) {
struct hlist_node *node;
@ -1510,7 +1510,7 @@ EXPORT_SYMBOL(inode_wait);
* until the deletion _might_ have completed. Callers are responsible
* to recheck inode state.
*
* It doesn't matter if I_LOCK is not set initially, a call to
* It doesn't matter if I_NEW is not set initially, a call to
* wake_up_inode() after removing from the hash list will DTRT.
*
* This is called with inode_lock held.
@ -1518,8 +1518,8 @@ EXPORT_SYMBOL(inode_wait);
static void __wait_on_freeing_inode(struct inode *inode)
{
wait_queue_head_t *wq;
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_LOCK);
wq = bit_waitqueue(&inode->i_state, __I_LOCK);
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW);
wq = bit_waitqueue(&inode->i_state, __I_NEW);
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
spin_unlock(&inode_lock);
schedule();

2
fs/jfs/jfs_txnmgr.c
View file

@ -1292,7 +1292,7 @@ int txCommit(tid_t tid, /* transaction identifier */
*/
/*
* I believe this code is no longer needed. Splitting I_LOCK
* into two bits, I_LOCK and I_SYNC should prevent this
* into two bits, I_NEW and I_SYNC should prevent this
* deadlock as well. But since I don't have a JFS testload
* to verify this, only a trivial s/I_LOCK/I_SYNC/ was done.
* Joern

2
fs/namei.c
View file

@ -1764,7 +1764,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
path_to_nameidata(&path, &nd);
error = -EISDIR;
if (path.dentry->d_inode && S_ISDIR(path.dentry->d_inode->i_mode))
if (S_ISDIR(path.dentry->d_inode->i_mode))
goto exit;
ok:
/*

6
fs/ntfs/inode.c
View file

@ -530,7 +530,7 @@ static int ntfs_is_extended_system_file(ntfs_attr_search_ctx *ctx)
* the ntfs inode.
*
* Q: What locks are held when the function is called?
* A: i_state has I_LOCK set, hence the inode is locked, also
* A: i_state has I_NEW set, hence the inode is locked, also
* i_count is set to 1, so it is not going to go away
* i_flags is set to 0 and we have no business touching it. Only an ioctl()
* is allowed to write to them. We should of course be honouring them but
@ -1207,7 +1207,7 @@ static int ntfs_read_locked_inode(struct inode *vi)
* necessary fields in @vi as well as initializing the ntfs inode.
*
* Q: What locks are held when the function is called?
* A: i_state has I_LOCK set, hence the inode is locked, also
* A: i_state has I_NEW set, hence the inode is locked, also
* i_count is set to 1, so it is not going to go away
*
* Return 0 on success and -errno on error. In the error case, the inode will
@ -1474,7 +1474,7 @@ static int ntfs_read_locked_attr_inode(struct inode *base_vi, struct inode *vi)
* normal directory inodes.
*
* Q: What locks are held when the function is called?
* A: i_state has I_LOCK set, hence the inode is locked, also
* A: i_state has I_NEW set, hence the inode is locked, also
* i_count is set to 1, so it is not going to go away
*
* Return 0 on success and -errno on error. In the error case, the inode will

18
fs/pipe.c
View file

@ -906,17 +906,6 @@ void free_pipe_info(struct inode *inode)
}
static struct vfsmount *pipe_mnt __read_mostly;
static int pipefs_delete_dentry(struct dentry *dentry)
{
/*
* At creation time, we pretended this dentry was hashed
* (by clearing DCACHE_UNHASHED bit in d_flags)
* At delete time, we restore the truth : not hashed.
* (so that dput() can proceed correctly)
*/
dentry->d_flags |= DCACHE_UNHASHED;
return 0;
}
/*
* pipefs_dname() is called from d_path().
@ -928,7 +917,6 @@ static char *pipefs_dname(struct dentry *dentry, char *buffer, int buflen)
}
static const struct dentry_operations pipefs_dentry_operations = {
.d_delete = pipefs_delete_dentry,
.d_dname = pipefs_dname,
};
@ -989,12 +977,6 @@ struct file *create_write_pipe(int flags)
path.mnt = mntget(pipe_mnt);
path.dentry->d_op = &pipefs_dentry_operations;
/*
* We dont want to publish this dentry into global dentry hash table.
* We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
* This permits a working /proc/$pid/fd/XXX on pipes
*/
path.dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(path.dentry, inode);
err = -ENFILE;

71
fs/stack.c
View file

@ -7,18 +7,63 @@
* This function cannot be inlined since i_size_{read,write} is rather
* heavy-weight on 32-bit systems
*/
void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
void fsstack_copy_inode_size(struct inode *dst, struct inode *src)
{
i_size_write(dst, i_size_read((struct inode *)src));
dst->i_blocks = src->i_blocks;
loff_t i_size;
blkcnt_t i_blocks;
/*
* i_size_read() includes its own seqlocking and protection from
* preemption (see include/linux/fs.h): we need nothing extra for
* that here, and prefer to avoid nesting locks than attempt to keep
* i_size and i_blocks in sync together.
*/
i_size = i_size_read(src);
/*
* But if CONFIG_LBDAF (on 32-bit), we ought to make an effort to
* keep the two halves of i_blocks in sync despite SMP or PREEMPT -
* though stat's generic_fillattr() doesn't bother, and we won't be
* applying quotas (where i_blocks does become important) at the
* upper level.
*
* We don't actually know what locking is used at the lower level;
* but if it's a filesystem that supports quotas, it will be using
* i_lock as in inode_add_bytes(). tmpfs uses other locking, and
* its 32-bit is (just) able to exceed 2TB i_size with the aid of
* holes; but its i_blocks cannot carry into the upper long without
* almost 2TB swap - let's ignore that case.
*/
if (sizeof(i_blocks) > sizeof(long))
spin_lock(&src->i_lock);
i_blocks = src->i_blocks;
if (sizeof(i_blocks) > sizeof(long))
spin_unlock(&src->i_lock);
/*
* If CONFIG_SMP or CONFIG_PREEMPT on 32-bit, it's vital for
* fsstack_copy_inode_size() to hold some lock around
* i_size_write(), otherwise i_size_read() may spin forever (see
* include/linux/fs.h). We don't necessarily hold i_mutex when this
* is called, so take i_lock for that case.
*
* And if CONFIG_LBADF (on 32-bit), continue our effort to keep the
* two halves of i_blocks in sync despite SMP or PREEMPT: use i_lock
* for that case too, and do both at once by combining the tests.
*
* There is none of this locking overhead in the 64-bit case.
*/
if (sizeof(i_size) > sizeof(long) || sizeof(i_blocks) > sizeof(long))
spin_lock(&dst->i_lock);
i_size_write(dst, i_size);
dst->i_blocks = i_blocks;
if (sizeof(i_size) > sizeof(long) || sizeof(i_blocks) > sizeof(long))
spin_unlock(&dst->i_lock);
}
EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
/* copy all attributes; get_nlinks is optional way to override the i_nlink
* copying
*/
void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
int (*get_nlinks)(struct inode *))
/* copy all attributes */
void fsstack_copy_attr_all(struct inode *dest, const struct inode *src)
{
dest->i_mode = src->i_mode;
dest->i_uid = src->i_uid;
@ -29,14 +74,6 @@ void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
dest->i_ctime = src->i_ctime;
dest->i_blkbits = src->i_blkbits;
dest->i_flags = src->i_flags;
/*
* Update the nlinks AFTER updating the above fields, because the
* get_links callback may depend on them.
*/
if (!get_nlinks)
dest->i_nlink = src->i_nlink;
else
dest->i_nlink = (*get_nlinks)(dest);
dest->i_nlink = src->i_nlink;
}
EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);

59
fs/sync.c
View file

@ -355,6 +355,7 @@ SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
{
int ret;
struct file *file;
struct address_space *mapping;
loff_t endbyte; /* inclusive */
int fput_needed;
umode_t i_mode;
@ -405,7 +406,28 @@ SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
!S_ISLNK(i_mode))
goto out_put;
ret = do_sync_mapping_range(file->f_mapping, offset, endbyte, flags);
mapping = file->f_mapping;
if (!mapping) {
ret = -EINVAL;
goto out_put;
}
ret = 0;
if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
ret = filemap_fdatawait_range(mapping, offset, endbyte);
if (ret < 0)
goto out_put;
}
if (flags & SYNC_FILE_RANGE_WRITE) {
ret = filemap_fdatawrite_range(mapping, offset, endbyte);
if (ret < 0)
goto out_put;
}
if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
ret = filemap_fdatawait_range(mapping, offset, endbyte);
out_put:
fput_light(file, fput_needed);
out:
@ -437,38 +459,3 @@ asmlinkage long SyS_sync_file_range2(long fd, long flags,
}
SYSCALL_ALIAS(sys_sync_file_range2, SyS_sync_file_range2);
#endif
/*
* `endbyte' is inclusive
*/
int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
loff_t endbyte, unsigned int flags)
{
int ret;
if (!mapping) {
ret = -EINVAL;
goto out;
}
ret = 0;
if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
ret = filemap_fdatawait_range(mapping, offset, endbyte);
if (ret < 0)
goto out;
}
if (flags & SYNC_FILE_RANGE_WRITE) {
ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
WB_SYNC_ALL);
if (ret < 0)
goto out;
}
if (flags & SYNC_FILE_RANGE_WAIT_AFTER) {
ret = filemap_fdatawait_range(mapping, offset, endbyte);
}
out:
return ret;
}
EXPORT_SYMBOL_GPL(do_sync_mapping_range);

2
fs/ubifs/file.c
View file

@ -45,7 +45,7 @@
*
* Similarly, @i_mutex is not always locked in 'ubifs_readpage()', e.g., the
* read-ahead path does not lock it ("sys_read -> generic_file_aio_read ->
* ondemand_readahead -> readpage"). In case of readahead, @I_LOCK flag is not
* ondemand_readahead -> readpage"). In case of readahead, @I_SYNC flag is not
* set as well. However, UBIFS disables readahead.
*/

2
fs/xfs/linux-2.6/xfs_iops.c
View file

@ -794,7 +794,7 @@ xfs_setup_inode(
struct inode *inode = &ip->i_vnode;
inode->i_ino = ip->i_ino;
inode->i_state = I_NEW|I_LOCK;
inode->i_state = I_NEW;
inode_add_to_lists(ip->i_mount->m_super, inode);
inode->i_mode = ip->i_d.di_mode;

4
fs/xfs/xfs_iget.c
View file

@ -91,7 +91,7 @@ xfs_inode_alloc(
ip->i_new_size = 0;
/* prevent anyone from using this yet */
VFS_I(ip)->i_state = I_NEW|I_LOCK;
VFS_I(ip)->i_state = I_NEW;
return ip;
}
@ -217,7 +217,7 @@ xfs_iget_cache_hit(
trace_xfs_iget_reclaim(ip);
goto out_error;
}
inode->i_state = I_LOCK|I_NEW;
inode->i_state = I_NEW;
} else {
/* If the VFS inode is being torn down, pause and try again. */
if (!igrab(inode)) {

2
include/asm-generic/fcntl.h
View file

@ -51,7 +51,7 @@
#endif
/*
* Before Linux 2.6.32 only O_DSYNC semantics were implemented, but using
* Before Linux 2.6.33 only O_DSYNC semantics were implemented, but using
* the O_SYNC flag. We continue to use the existing numerical value
* for O_DSYNC semantics now, but using the correct symbolic name for it.
* This new value is used to request true Posix O_SYNC semantics. It is

40
include/linux/fs.h
View file

@ -1095,10 +1095,6 @@ struct file_lock {
extern void send_sigio(struct fown_struct *fown, int fd, int band);
/* fs/sync.c */
extern int do_sync_mapping_range(struct address_space *mapping, loff_t offset,
loff_t endbyte, unsigned int flags);
#ifdef CONFIG_FILE_LOCKING
extern int fcntl_getlk(struct file *, struct flock __user *);
extern int fcntl_setlk(unsigned int, struct file *, unsigned int,
@ -1591,7 +1587,7 @@ struct super_operations {
* until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at
* various stages of removing an inode.
*
* Two bits are used for locking and completion notification, I_LOCK and I_SYNC.
* Two bits are used for locking and completion notification, I_NEW and I_SYNC.
*
* I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on
* fdatasync(). i_atime is the usual cause.
@ -1600,8 +1596,14 @@ struct super_operations {
* don't have to write inode on fdatasync() when only
* mtime has changed in it.
* I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean.
* I_NEW get_new_inode() sets i_state to I_LOCK|I_NEW. Both
* are cleared by unlock_new_inode(), called from iget().
* I_NEW Serves as both a mutex and completion notification.
* New inodes set I_NEW. If two processes both create
* the same inode, one of them will release its inode and
* wait for I_NEW to be released before returning.
* Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
* also cause waiting on I_NEW, without I_NEW actually
* being set. find_inode() uses this to prevent returning
* nearly-dead inodes.
* I_WILL_FREE Must be set when calling write_inode_now() if i_count
* is zero. I_FREEING must be set when I_WILL_FREE is
* cleared.
@ -1615,20 +1617,11 @@ struct super_operations {
* prohibited for many purposes. iget() must wait for
* the inode to be completely released, then create it
* anew. Other functions will just ignore such inodes,
* if appropriate. I_LOCK is used for waiting.
* if appropriate. I_NEW is used for waiting.
*
* I_LOCK Serves as both a mutex and completion notification.
* New inodes set I_LOCK. If two processes both create
* the same inode, one of them will release its inode and
* wait for I_LOCK to be released before returning.
* Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can
* also cause waiting on I_LOCK, without I_LOCK actually
* being set. find_inode() uses this to prevent returning
* nearly-dead inodes.
* I_SYNC Similar to I_LOCK, but limited in scope to writeback
* of inode dirty data. Having a separate lock for this
* purpose reduces latency and prevents some filesystem-
* specific deadlocks.
* I_SYNC Synchonized write of dirty inode data. The bits is
* set during data writeback, and cleared with a wakeup
* on the bit address once it is done.
*
* Q: What is the difference between I_WILL_FREE and I_FREEING?
* Q: igrab() only checks on (I_FREEING|I_WILL_FREE). Should it also check on
@ -1637,13 +1630,12 @@ struct super_operations {
#define I_DIRTY_SYNC 1
#define I_DIRTY_DATASYNC 2
#define I_DIRTY_PAGES 4
#define I_NEW 8
#define __I_NEW 3
#define I_NEW (1 << __I_NEW)
#define I_WILL_FREE 16
#define I_FREEING 32
#define I_CLEAR 64
#define __I_LOCK 7
#define I_LOCK (1 << __I_LOCK)
#define __I_SYNC 8
#define __I_SYNC 7
#define I_SYNC (1 << __I_SYNC)
#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES)

6
include/linux/fs_stack.h
View file

@ -8,10 +8,8 @@
#include <linux/fs.h>
/* externs for fs/stack.c */
extern void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
int (*get_nlinks)(struct inode *));
extern void fsstack_copy_inode_size(struct inode *dst, const struct inode *src);
extern void fsstack_copy_attr_all(struct inode *dest, const struct inode *src);
extern void fsstack_copy_inode_size(struct inode *dst, struct inode *src);
/* inlines */
static inline void fsstack_copy_attr_atime(struct inode *dest,

3
include/linux/writeback.h
View file

@ -79,8 +79,7 @@ void wakeup_flusher_threads(long nr_pages);
static inline void wait_on_inode(struct inode *inode)
{
might_sleep();
wait_on_bit(&inode->i_state, __I_LOCK, inode_wait,
TASK_UNINTERRUPTIBLE);
wait_on_bit(&inode->i_state, __I_NEW, inode_wait, TASK_UNINTERRUPTIBLE);
}
static inline void inode_sync_wait(struct inode *inode)
{

19
net/socket.c
View file

@ -312,18 +312,6 @@ static struct file_system_type sock_fs_type = {
.kill_sb = kill_anon_super,
};
static int sockfs_delete_dentry(struct dentry *dentry)
{
/*
* At creation time, we pretended this dentry was hashed
* (by clearing DCACHE_UNHASHED bit in d_flags)
* At delete time, we restore the truth : not hashed.
* (so that dput() can proceed correctly)
*/
dentry->d_flags |= DCACHE_UNHASHED;
return 0;
}
/*
* sockfs_dname() is called from d_path().
*/
@ -334,7 +322,6 @@ static char *sockfs_dname(struct dentry *dentry, char *buffer, int buflen)
}
static const struct dentry_operations sockfs_dentry_operations = {
.d_delete = sockfs_delete_dentry,
.d_dname = sockfs_dname,
};
@ -374,12 +361,6 @@ static int sock_alloc_file(struct socket *sock, struct file **f, int flags)
path.mnt = mntget(sock_mnt);
path.dentry->d_op = &sockfs_dentry_operations;
/*
* We dont want to push this dentry into global dentry hash table.
* We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
* This permits a working /proc/$pid/fd/XXX on sockets
*/
path.dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(path.dentry, SOCK_INODE(sock));
SOCK_INODE(sock)->i_fop = &socket_file_ops;