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Subject[PATCH -V3 5/6] fs/9p: Implement create time inheritance
Date
Inherit default ACL on create

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/9p/acl.c | 52 +++++++++++++++++++
fs/9p/acl.h | 17 ++++++
fs/9p/vfs_inode.c | 141 ++++++++++++++++++++++++++++++++++++----------------
3 files changed, 166 insertions(+), 44 deletions(-)

diff --git a/fs/9p/acl.c b/fs/9p/acl.c
index 203da2b..1c50a9f 100644
--- a/fs/9p/acl.c
+++ b/fs/9p/acl.c
@@ -152,6 +152,58 @@ int v9fs_acl_chmod(struct dentry *dentry)
return retval;
}

+int v9fs_set_create_acl(struct dentry *dentry,
+ struct posix_acl *dpacl, struct posix_acl *pacl)
+{
+ if (dpacl)
+ v9fs_set_acl(dentry, ACL_TYPE_DEFAULT, dpacl);
+ if (pacl)
+ v9fs_set_acl(dentry, ACL_TYPE_ACCESS, pacl);
+ posix_acl_release(dpacl);
+ posix_acl_release(pacl);
+ return 0;
+}
+
+int v9fs_acl_mode(struct inode *dir, mode_t *modep,
+ struct posix_acl **dpacl, struct posix_acl **pacl)
+{
+ int retval = 0;
+ mode_t mode = *modep;
+ struct posix_acl *acl = NULL;
+
+ if (!S_ISLNK(mode)) {
+ acl = v9fs_get_cached_acl(dir, ACL_TYPE_DEFAULT);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (!acl)
+ mode &= ~current_umask();
+ }
+ if (acl) {
+ struct posix_acl *clone;
+
+ if (S_ISDIR(mode))
+ *dpacl = acl;
+ clone = posix_acl_clone(acl, GFP_NOFS);
+ retval = -ENOMEM;
+ if (!clone)
+ goto cleanup;
+
+ retval = posix_acl_create_masq(clone, &mode);
+ if (retval < 0) {
+ posix_acl_release(clone);
+ goto cleanup;
+ }
+ if (retval > 0)
+ *pacl = clone;
+ }
+ *modep = mode;
+ return 0;
+cleanup:
+ posix_acl_release(acl);
+ return retval;
+
+}
+
static int v9fs_xattr_get_acl(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
diff --git a/fs/9p/acl.h b/fs/9p/acl.h
index 0adcc43..59e18c2 100644
--- a/fs/9p/acl.h
+++ b/fs/9p/acl.h
@@ -18,6 +18,10 @@
extern int v9fs_get_acl(struct inode *, struct p9_fid *);
extern int v9fs_check_acl(struct inode *inode, int mask);
extern int v9fs_acl_chmod(struct dentry *);
+extern int v9fs_set_create_acl(struct dentry *,
+ struct posix_acl *, struct posix_acl *);
+extern int v9fs_acl_mode(struct inode *dir, mode_t *modep,
+ struct posix_acl **dpacl, struct posix_acl **pacl);
#else
#define v9fs_check_acl NULL
static inline int v9fs_get_acl(struct inode *inode, struct p9_fid *fid)
@@ -28,5 +32,18 @@ static inline int v9fs_acl_chmod(struct dentry *dentry)
{
return 0;
}
+static inline int v9fs_set_create_acl(struct dentry *dentry,
+ struct posix_acl *dpacl,
+ struct posix_acl *pacl)
+{
+ return 0;
+}
+static inline int v9fs_acl_mode(struct inode *dir, mode_t *modep,
+ struct posix_acl **dpacl,
+ struct posix_acl **pacl)
+{
+ return 0;
+}
+
#endif
#endif /* FS_9P_XATTR_H */
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 7983698..2f904a8 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -662,19 +662,21 @@ error:
*/

static int
-v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode,
+v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
struct nameidata *nd)
{
int err = 0;
char *name = NULL;
gid_t gid;
int flags;
+ mode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL;
struct p9_fid *dfid, *ofid;
struct file *filp;
struct p9_qid qid;
struct inode *inode;
+ struct posix_acl *pacl = NULL, *dacl = NULL;

v9ses = v9fs_inode2v9ses(dir);
if (nd && nd->flags & LOOKUP_OPEN)
@@ -684,7 +686,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode,

name = (char *) dentry->d_name.name;
P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
- "mode:0x%x\n", name, flags, mode);
+ "mode:0x%x\n", name, flags, omode);

dfid = v9fs_fid_lookup(dentry->d_parent);
if (IS_ERR(dfid)) {
@@ -702,6 +704,15 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode,
}

gid = v9fs_get_fsgid_for_create(dir);
+
+ mode = omode;
+ /* Update mode based on ACL value */
+ err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
+ if (err) {
+ P9_DPRINTK(P9_DEBUG_VFS,
+ "Failed to get acl values in creat %d\n", err);
+ goto error;
+ }
err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
if (err < 0) {
P9_DPRINTK(P9_DEBUG_VFS,
@@ -709,42 +720,48 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int mode,
err);
goto error;
}
+ /* instantiate inode and assign the unopened fid to the dentry */
+ if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE ||
+ (nd && nd->flags & LOOKUP_OPEN)) {
+ fid = p9_client_walk(dfid, 1, &name, 1);
+ if (IS_ERR(fid)) {
+ err = PTR_ERR(fid);
+ P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
+ err);
+ fid = NULL;
+ goto error;
+ }

- /* No need to populate the inode if we are not opening the file AND
- * not in cached mode.
- */
- if (!v9ses->cache && !(nd && nd->flags & LOOKUP_OPEN)) {
- /* Not in cached mode. No need to populate inode with stat */
- dentry->d_op = &v9fs_dentry_operations;
- p9_client_clunk(ofid);
- d_instantiate(dentry, NULL);
- return 0;
- }
-
- /* Now walk from the parent so we can get an unopened fid. */
- fid = p9_client_walk(dfid, 1, &name, 1);
- if (IS_ERR(fid)) {
- err = PTR_ERR(fid);
- P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
- fid = NULL;
- goto error;
- }
-
- /* instantiate inode and assign the unopened fid to dentry */
- inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
- if (IS_ERR(inode)) {
- err = PTR_ERR(inode);
- P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
- goto error;
- }
- if (v9ses->cache)
+ inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
+ err);
+ goto error;
+ }
dentry->d_op = &v9fs_cached_dentry_operations;
- else
+ d_instantiate(dentry, inode);
+ err = v9fs_fid_add(dentry, fid);
+ if (err < 0)
+ goto error;
+ /* The fid would get clunked via a dput */
+ fid = NULL;
+ } else {
+ /*
+ * Not in cached mode. No need to populate
+ * inode with stat. We need to get an inode
+ * so that we can set the acl with dentry
+ */
+ inode = v9fs_get_inode(dir->i_sb, mode);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto error;
+ }
dentry->d_op = &v9fs_dentry_operations;
- d_instantiate(dentry, inode);
- err = v9fs_fid_add(dentry, fid);
- if (err < 0)
- goto error;
+ d_instantiate(dentry, inode);
+ }
+ /* Now set the ACL based on the default value */
+ v9fs_set_create_acl(dentry, dacl, pacl);

/* if we are opening a file, assign the open fid to the file */
if (nd && nd->flags & LOOKUP_OPEN) {
@@ -866,25 +883,28 @@ static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
*
*/

-static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry,
- int mode)
+static int v9fs_vfs_mkdir_dotl(struct inode *dir,
+ struct dentry *dentry, int omode)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
gid_t gid;
char *name;
+ mode_t mode;
struct inode *inode;
struct p9_qid qid;
struct dentry *dir_dentry;
+ struct posix_acl *dacl = NULL, *pacl = NULL;

P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
err = 0;
v9ses = v9fs_inode2v9ses(dir);

- mode |= S_IFDIR;
+ omode |= S_IFDIR;
if (dir->i_mode & S_ISGID)
- mode |= S_ISGID;
+ omode |= S_ISGID;
+
dir_dentry = v9fs_dentry_from_dir_inode(dir);
dfid = v9fs_fid_lookup(dir_dentry);
if (IS_ERR(dfid)) {
@@ -895,7 +915,14 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry,
}

gid = v9fs_get_fsgid_for_create(dir);
-
+ mode = omode;
+ /* Update mode based on ACL value */
+ err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
+ if (err) {
+ P9_DPRINTK(P9_DEBUG_VFS,
+ "Failed to get acl values in mkdir %d\n", err);
+ goto error;
+ }
name = (char *) dentry->d_name.name;
err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
if (err < 0)
@@ -925,7 +952,23 @@ static int v9fs_vfs_mkdir_dotl(struct inode *dir, struct dentry *dentry,
if (err < 0)
goto error;
fid = NULL;
+ } else {
+ /*
+ * Not in cached mode. No need to populate
+ * inode with stat. We need to get an inode
+ * so that we can set the acl with dentry
+ */
+ inode = v9fs_get_inode(dir->i_sb, mode);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto error;
+ }
+ dentry->d_op = &v9fs_dentry_operations;
+ d_instantiate(dentry, inode);
}
+ /* Now set the ACL based on the default value */
+ v9fs_set_create_acl(dentry, dacl, pacl);
+
error:
if (fid)
p9_client_clunk(fid);
@@ -1860,21 +1903,23 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
*
*/
static int
-v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
+v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
dev_t rdev)
{
int err;
char *name;
+ mode_t mode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid = NULL, *dfid = NULL;
struct inode *inode;
gid_t gid;
struct p9_qid qid;
struct dentry *dir_dentry;
+ struct posix_acl *dacl = NULL, *pacl = NULL;

P9_DPRINTK(P9_DEBUG_VFS,
" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
- dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
+ dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));

if (!new_valid_dev(rdev))
return -EINVAL;
@@ -1890,7 +1935,14 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
}

gid = v9fs_get_fsgid_for_create(dir);
-
+ mode = omode;
+ /* Update mode based on ACL value */
+ err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
+ if (err) {
+ P9_DPRINTK(P9_DEBUG_VFS,
+ "Failed to get acl values in mknod %d\n", err);
+ goto error;
+ }
name = (char *) dentry->d_name.name;

err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
@@ -1934,7 +1986,8 @@ v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
dentry->d_op = &v9fs_dentry_operations;
d_instantiate(dentry, inode);
}
-
+ /* Now set the ACL based on the default value */
+ v9fs_set_create_acl(dentry, dacl, pacl);
error:
if (fid)
p9_client_clunk(fid);
--
1.7.0.4


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