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fs: provide rcu-walk aware permission i_ops

Browse source 
Signed-off-by: Nick Piggin <[email protected]>
This commit is contained in:
Nick Piggin 2011-01-07 17:49:58 +11:00
commit b74c79e993
60 changed files with 287 additions and 146 deletions
Download patch file Download diff file Expand all files Collapse all files

5
fs/gfs2/acl.c
View file

@ -75,11 +75,14 @@ static struct posix_acl *gfs2_acl_get(struct gfs2_inode *ip, int type)
* Returns: errno
*/
int gfs2_check_acl(struct inode *inode, int mask)
int gfs2_check_acl(struct inode *inode, int mask, unsigned int flags)
{
struct posix_acl *acl;
int error;
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
acl = gfs2_acl_get(GFS2_I(inode), ACL_TYPE_ACCESS);
if (IS_ERR(acl))
return PTR_ERR(acl);

2
fs/gfs2/acl.h
View file

@ -16,7 +16,7 @@
#define GFS2_POSIX_ACL_DEFAULT "posix_acl_default"
#define GFS2_ACL_MAX_ENTRIES 25
extern int gfs2_check_acl(struct inode *inode, int mask);
extern int gfs2_check_acl(struct inode *inode, int mask, unsigned int);
extern int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode);
extern int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr);
extern const struct xattr_handler gfs2_xattr_system_handler;

2
fs/gfs2/file.c
View file

@ -241,7 +241,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
!capable(CAP_LINUX_IMMUTABLE))
goto out;
if (!IS_IMMUTABLE(inode)) {
error = gfs2_permission(inode, MAY_WRITE);
error = gfs2_permission(inode, MAY_WRITE, 0);
if (error)
goto out;
}

4
fs/gfs2/inode.c
View file

@ -509,7 +509,7 @@ struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
}
if (!is_root) {
error = gfs2_permission(dir, MAY_EXEC);
error = gfs2_permission(dir, MAY_EXEC, 0);
if (error)
goto out;
}
@ -539,7 +539,7 @@ static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
{
int error;
error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
if (error)
return error;

2
fs/gfs2/inode.h
View file

@ -113,7 +113,7 @@ extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
extern struct inode *gfs2_createi(struct gfs2_holder *ghs,
const struct qstr *name,
unsigned int mode, dev_t dev);
extern int gfs2_permission(struct inode *inode, int mask);
extern int gfs2_permission(struct inode *inode, int mask, unsigned int flags);
extern int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr);
extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);

18
fs/gfs2/ops_inode.c
View file

@ -166,7 +166,7 @@ static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
if (error)
goto out_child;
error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
if (error)
goto out_gunlock;
@ -289,7 +289,7 @@ static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
if (IS_APPEND(&dip->i_inode))
return -EPERM;
error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
if (error)
return error;
@ -822,7 +822,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
}
}
} else {
error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0);
if (error)
goto out_gunlock;
@ -857,7 +857,7 @@ static int gfs2_rename(struct inode *odir, struct dentry *odentry,
/* Check out the dir to be renamed */
if (dir_rename) {
error = gfs2_permission(odentry->d_inode, MAY_WRITE);
error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0);
if (error)
goto out_gunlock;
}
@ -1041,13 +1041,17 @@ static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
* Returns: errno
*/
int gfs2_permission(struct inode *inode, int mask)
int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_inode *ip;
struct gfs2_holder i_gh;
int error;
int unlock = 0;
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
ip = GFS2_I(inode);
if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
if (error)
@ -1058,7 +1062,7 @@ int gfs2_permission(struct inode *inode, int mask)
if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
error = -EACCES;
else
error = generic_permission(inode, mask, gfs2_check_acl);
error = generic_permission(inode, mask, flags, gfs2_check_acl);
if (unlock)
gfs2_glock_dq_uninit(&i_gh);