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

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  [patch 2/3] vfs: dcache cleanups
  [patch 1/3] vfs: dcache sparse fixes
  [patch 3/3] vfs: make d_path() consistent across mount operations
  [patch 4/4] flock: remove unused fields from file_lock_operations
  [patch 3/4] vfs: fix ERR_PTR abuse in generic_readlink
  [patch 2/4] fs: make struct file arg to d_path const
  [patch 1/4] vfs: path_{get,put}() cleanups
  [patch for 2.6.26 4/4] vfs: utimensat(): fix write access check for futimens()
  [patch for 2.6.26 3/4] vfs: utimensat(): fix error checking for {UTIME_NOW,UTIME_OMIT} case
  [patch for 2.6.26 1/4] vfs: utimensat(): ignore tv_sec if tv_nsec == UTIME_OMIT or UTIME_NOW
  [patch for 2.6.26 2/4] vfs: utimensat(): be consistent with utime() for immutable and append-only files
  [PATCH] fix cgroup-inflicted breakage in block_dev.c
This commit is contained in:
Linus Torvalds 2008-06-29 12:14:37 -07:00
parent 543cf4cb3f cdd16d0265
commit 4f46accee4
8 changed files with 89 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/block_dev.c
View File

@ -931,8 +931,16 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
struct gendisk *disk;
int ret;
int part;
int perm = 0;
ret = devcgroup_inode_permission(bdev->bd_inode, file->f_mode);
if (file->f_mode & FMODE_READ)
perm |= MAY_READ;
if (file->f_mode & FMODE_WRITE)
perm |= MAY_WRITE;
/*
* hooks: /n/, see "layering violations".
*/
ret = devcgroup_inode_permission(bdev->bd_inode, perm);
if (ret != 0)
return ret;

68
fs/dcache.c
View File

@ -17,6 +17,7 @@
#include <linux/syscalls.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/fdtable.h>
#include <linux/fs.h>
#include <linux/fsnotify.h>
#include <linux/slab.h>
@ -106,9 +107,10 @@ static void dentry_lru_remove(struct dentry *dentry)
/*
* Release the dentry's inode, using the filesystem
* d_iput() operation if defined.
* Called with dcache_lock and per dentry lock held, drops both.
*/
static void dentry_iput(struct dentry * dentry)
__releases(dentry->d_lock)
__releases(dcache_lock)
{
struct inode *inode = dentry->d_inode;
if (inode) {
@ -132,12 +134,13 @@ static void dentry_iput(struct dentry * dentry)
* d_kill - kill dentry and return parent
* @dentry: dentry to kill
*
* Called with dcache_lock and d_lock, releases both. The dentry must
* already be unhashed and removed from the LRU.
* The dentry must already be unhashed and removed from the LRU.
*
* If this is the root of the dentry tree, return NULL.
*/
static struct dentry *d_kill(struct dentry *dentry)
__releases(dentry->d_lock)
__releases(dcache_lock)
{
struct dentry *parent;
@ -383,11 +386,11 @@ restart:
* Try to prune ancestors as well. This is necessary to prevent
* quadratic behavior of shrink_dcache_parent(), but is also expected
* to be beneficial in reducing dentry cache fragmentation.
*
* Called with dcache_lock, drops it and then regains.
* Called with dentry->d_lock held, drops it.
*/
static void prune_one_dentry(struct dentry * dentry)
__releases(dentry->d_lock)
__releases(dcache_lock)
__acquires(dcache_lock)
{
__d_drop(dentry);
dentry = d_kill(dentry);
@ -1604,10 +1607,9 @@ static int d_isparent(struct dentry *p1, struct dentry *p2)
*
* Note: If ever the locking in lock_rename() changes, then please
* remember to update this too...
*
* On return, dcache_lock will have been unlocked.
*/
static struct dentry *__d_unalias(struct dentry *dentry, struct dentry *alias)
__releases(dcache_lock)
{
struct mutex *m1 = NULL, *m2 = NULL;
struct dentry *ret;
@ -1743,11 +1745,9 @@ out_nolock:
shouldnt_be_hashed:
spin_unlock(&dcache_lock);
BUG();
goto shouldnt_be_hashed;
}
static int prepend(char **buffer, int *buflen, const char *str,
int namelen)
static int prepend(char **buffer, int *buflen, const char *str, int namelen)
{
*buflen -= namelen;
if (*buflen < 0)
@ -1757,8 +1757,13 @@ static int prepend(char **buffer, int *buflen, const char *str,
return 0;
}
static int prepend_name(char **buffer, int *buflen, struct qstr *name)
{
return prepend(buffer, buflen, name->name, name->len);
}
/**
* d_path - return the path of a dentry
* __d_path - return the path of a dentry
* @path: the dentry/vfsmount to report
* @root: root vfsmnt/dentry (may be modified by this function)
* @buffer: buffer to return value in
@ -1779,9 +1784,10 @@ char *__d_path(const struct path *path, struct path *root,
{
struct dentry *dentry = path->dentry;
struct vfsmount *vfsmnt = path->mnt;
char * end = buffer+buflen;
char * retval;
char *end = buffer + buflen;
char *retval;
spin_lock(&vfsmount_lock);
prepend(&end, &buflen, "\0", 1);
if (!IS_ROOT(dentry) && d_unhashed(dentry) &&
(prepend(&end, &buflen, " (deleted)", 10) != 0))
@ -1800,38 +1806,37 @@ char *__d_path(const struct path *path, struct path *root,
break;
if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
/* Global root? */
spin_lock(&vfsmount_lock);
if (vfsmnt->mnt_parent == vfsmnt) {
spin_unlock(&vfsmount_lock);
goto global_root;
}
dentry = vfsmnt->mnt_mountpoint;
vfsmnt = vfsmnt->mnt_parent;
spin_unlock(&vfsmount_lock);
continue;
}
parent = dentry->d_parent;
prefetch(parent);
if ((prepend(&end, &buflen, dentry->d_name.name,
dentry->d_name.len) != 0) ||
if ((prepend_name(&end, &buflen, &dentry->d_name) != 0) ||
(prepend(&end, &buflen, "/", 1) != 0))
goto Elong;
retval = end;
dentry = parent;
}
out:
spin_unlock(&vfsmount_lock);
return retval;
global_root:
retval += 1; /* hit the slash */
if (prepend(&retval, &buflen, dentry->d_name.name,
dentry->d_name.len) != 0)
if (prepend_name(&retval, &buflen, &dentry->d_name) != 0)
goto Elong;
root->mnt = vfsmnt;
root->dentry = dentry;
return retval;
goto out;
Elong:
return ERR_PTR(-ENAMETOOLONG);
retval = ERR_PTR(-ENAMETOOLONG);
goto out;
}
/**
@ -1845,9 +1850,9 @@ Elong:
*
* Returns the buffer or an error code if the path was too long.
*
* "buflen" should be positive. Caller holds the dcache_lock.
* "buflen" should be positive.
*/
char *d_path(struct path *path, char *buf, int buflen)
char *d_path(const struct path *path, char *buf, int buflen)
{
char *res;
struct path root;
@ -1915,16 +1920,11 @@ char *dentry_path(struct dentry *dentry, char *buf, int buflen)
retval = end-1;
*retval = '/';
for (;;) {
struct dentry *parent;
if (IS_ROOT(dentry))
break;
while (!IS_ROOT(dentry)) {
struct dentry *parent = dentry->d_parent;
parent = dentry->d_parent;
prefetch(parent);
if ((prepend(&end, &buflen, dentry->d_name.name,
dentry->d_name.len) != 0) ||
if ((prepend_name(&end, &buflen, &dentry->d_name) != 0) ||
(prepend(&end, &buflen, "/", 1) != 0))
goto Elong;
@ -1975,7 +1975,7 @@ asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
error = -ENOENT;
/* Has the current directory has been unlinked? */
spin_lock(&dcache_lock);
if (pwd.dentry->d_parent == pwd.dentry || !d_unhashed(pwd.dentry)) {
if (IS_ROOT(pwd.dentry) || !d_unhashed(pwd.dentry)) {
unsigned long len;
struct path tmp = root;
char * cwd;

6
fs/locks.c
View File

@ -561,9 +561,6 @@ static void locks_insert_lock(struct file_lock **pos, struct file_lock *fl)
/* insert into file's list */
fl->fl_next = *pos;
*pos = fl;
if (fl->fl_ops && fl->fl_ops->fl_insert)
fl->fl_ops->fl_insert(fl);
}
/*
@ -586,9 +583,6 @@ static void locks_delete_lock(struct file_lock **thisfl_p)
fl->fl_fasync = NULL;
}
if (fl->fl_ops && fl->fl_ops->fl_remove)
fl->fl_ops->fl_remove(fl);
if (fl->fl_nspid) {
put_pid(fl->fl_nspid);
fl->fl_nspid = NULL;

26
fs/namei.c
View File

@ -581,15 +581,13 @@ static __always_inline int link_path_walk(const char *name, struct nameidata *nd
int result;
/* make sure the stuff we saved doesn't go away */
dget(save.dentry);
mntget(save.mnt);
path_get(&save);
result = __link_path_walk(name, nd);
if (result == -ESTALE) {
/* nd->path had been dropped */
nd->path = save;
dget(nd->path.dentry);
mntget(nd->path.mnt);
path_get(&nd->path);
nd->flags |= LOOKUP_REVAL;
result = __link_path_walk(name, nd);
}
@ -1216,8 +1214,9 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
nd->flags = flags;
nd->depth = 0;
nd->path.mnt = mntget(mnt);
nd->path.dentry = dget(dentry);
nd->path.dentry = dentry;
nd->path.mnt = mnt;
path_get(&nd->path);
retval = path_walk(name, nd);
if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry &&
@ -2857,16 +2856,17 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
{
struct nameidata nd;
void *cookie;
int res;
nd.depth = 0;
cookie = dentry->d_inode->i_op->follow_link(dentry, &nd);
if (!IS_ERR(cookie)) {
int res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
if (dentry->d_inode->i_op->put_link)
dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
cookie = ERR_PTR(res);
}
return PTR_ERR(cookie);
if (IS_ERR(cookie))
return PTR_ERR(cookie);
res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
if (dentry->d_inode->i_op->put_link)
dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
return res;
}
int vfs_follow_link(struct nameidata *nd, const char *link)

10
fs/pipe.c
View File

@ -1003,8 +1003,7 @@ struct file *create_write_pipe(void)
void free_write_pipe(struct file *f)
{
free_pipe_info(f->f_dentry->d_inode);
dput(f->f_path.dentry);
mntput(f->f_path.mnt);
path_put(&f->f_path);
put_filp(f);
}
@ -1015,8 +1014,8 @@ struct file *create_read_pipe(struct file *wrf)
return ERR_PTR(-ENFILE);
/* Grab pipe from the writer */
f->f_path.mnt = mntget(wrf->f_path.mnt);
f->f_path.dentry = dget(wrf->f_path.dentry);
f->f_path = wrf->f_path;
path_get(&wrf->f_path);
f->f_mapping = wrf->f_path.dentry->d_inode->i_mapping;
f->f_pos = 0;
@ -1068,8 +1067,7 @@ int do_pipe(int *fd)
err_fdr:
put_unused_fd(fdr);
err_read_pipe:
dput(fr->f_dentry);
mntput(fr->f_vfsmnt);
path_put(&fr->f_path);
put_filp(fr);
err_write_pipe:
free_write_pipe(fw);

59
fs/utimes.c
View File

@ -40,14 +40,9 @@ asmlinkage long sys_utime(char __user *filename, struct utimbuf __user *times)
#endif
static bool nsec_special(long nsec)
{
return nsec == UTIME_OMIT || nsec == UTIME_NOW;
}
static bool nsec_valid(long nsec)
{
if (nsec_special(nsec))
if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
return true;
return nsec >= 0 && nsec <= 999999999;
@ -102,7 +97,11 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
if (error)
goto dput_and_out;
/* Don't worry, the checks are done in inode_change_ok() */
if (times && times[0].tv_nsec == UTIME_NOW &&
times[1].tv_nsec == UTIME_NOW)
times = NULL;
/* In most cases, the checks are done in inode_change_ok() */
newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
if (times) {
error = -EPERM;
@ -124,28 +123,34 @@ long do_utimes(int dfd, char __user *filename, struct timespec *times, int flags
newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
newattrs.ia_valid |= ATTR_MTIME_SET;
}
}
/*
* If times is NULL or both times are either UTIME_OMIT or
* UTIME_NOW, then need to check permissions, because
* inode_change_ok() won't do it.
*/
if (!times || (nsec_special(times[0].tv_nsec) &&
nsec_special(times[1].tv_nsec))) {
/*
* For the UTIME_OMIT/UTIME_NOW and UTIME_NOW/UTIME_OMIT
* cases, we need to make an extra check that is not done by
* inode_change_ok().
*/
if (((times[0].tv_nsec == UTIME_NOW &&
times[1].tv_nsec == UTIME_OMIT)
||
(times[0].tv_nsec == UTIME_OMIT &&
times[1].tv_nsec == UTIME_NOW))
&& !is_owner_or_cap(inode))
goto mnt_drop_write_and_out;
} else {
/*
* If times is NULL (or both times are UTIME_NOW),
* then we need to check permissions, because
* inode_change_ok() won't do it.
*/
error = -EACCES;
if (IS_IMMUTABLE(inode))
goto mnt_drop_write_and_out;
if (!is_owner_or_cap(inode)) {
if (f) {
if (!(f->f_mode & FMODE_WRITE))
goto mnt_drop_write_and_out;
} else {
error = vfs_permission(&nd, MAY_WRITE);
if (error)
goto mnt_drop_write_and_out;
}
error = permission(inode, MAY_WRITE, NULL);
if (error)
goto mnt_drop_write_and_out;
}
}
mutex_lock(&inode->i_mutex);
@ -169,14 +174,6 @@ asmlinkage long sys_utimensat(int dfd, char __user *filename, struct timespec __
if (utimes) {
if (copy_from_user(&tstimes, utimes, sizeof(tstimes)))
return -EFAULT;
if ((tstimes[0].tv_nsec == UTIME_OMIT ||
tstimes[0].tv_nsec == UTIME_NOW) &&
tstimes[0].tv_sec != 0)
return -EINVAL;
if ((tstimes[1].tv_nsec == UTIME_OMIT ||
tstimes[1].tv_nsec == UTIME_NOW) &&
tstimes[1].tv_sec != 0)
return -EINVAL;
/* Nothing to do, we must not even check the path. */
if (tstimes[0].tv_nsec == UTIME_OMIT &&

2
include/linux/dcache.h
View File

@ -300,7 +300,7 @@ extern int d_validate(struct dentry *, struct dentry *);
extern char *dynamic_dname(struct dentry *, char *, int, const char *, ...);
extern char *__d_path(const struct path *path, struct path *root, char *, int);
extern char *d_path(struct path *, char *, int);
extern char *d_path(const struct path *, char *, int);
extern char *dentry_path(struct dentry *, char *, int);
/* Allocation counts.. */

2
include/linux/fs.h
View File

@ -894,8 +894,6 @@ static inline int file_check_writeable(struct file *filp)
typedef struct files_struct *fl_owner_t;
struct file_lock_operations {
void (*fl_insert)(struct file_lock *); /* lock insertion callback */
void (*fl_remove)(struct file_lock *); /* lock removal callback */
void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
void (*fl_release_private)(struct file_lock *);
};