Re: [PATCH 13/18] reiserfs: use generic posix ACL infrastructure

Jan Kara
2013-12-02T22:17:36Z

On Sun 01-12-13 03:59:16, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@lst.de>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>

Honza

> ---
> fs/reiserfs/acl.h | 4 +-
> fs/reiserfs/file.c | 1 +
> fs/reiserfs/namei.c | 3 +
> fs/reiserfs/xattr.c | 5 +-
> fs/reiserfs/xattr_acl.c | 175 ++++++++---------------------------------------
> 5 files changed, 36 insertions(+), 152 deletions(-)
>
> diff --git a/fs/reiserfs/acl.h b/fs/reiserfs/acl.h
> index f096b80..4a211f5 100644
> --- a/fs/reiserfs/acl.h
> +++ b/fs/reiserfs/acl.h
> @@ -48,18 +48,18 @@ static inline int reiserfs_acl_count(size_t size)
>
> #ifdef CONFIG_REISERFS_FS_POSIX_ACL
> struct posix_acl *reiserfs_get_acl(struct inode *inode, int type);
> +int reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
> int reiserfs_acl_chmod(struct inode *inode);
> int reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
> struct inode *dir, struct dentry *dentry,
> struct inode *inode);
> int reiserfs_cache_default_acl(struct inode *dir);
> -extern const struct xattr_handler reiserfs_posix_acl_default_handler;
> -extern const struct xattr_handler reiserfs_posix_acl_access_handler;
>
> #else
>
> #define reiserfs_cache_default_acl(inode) 0
> #define reiserfs_get_acl NULL
> +#define reiserfs_set_acl NULL
>
> static inline int reiserfs_acl_chmod(struct inode *inode)
> {
> diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
> index dcaafcf..ed58d84 100644
> --- a/fs/reiserfs/file.c
> +++ b/fs/reiserfs/file.c
> @@ -260,4 +260,5 @@ const struct inode_operations reiserfs_file_inode_operations = {
> .removexattr = reiserfs_removexattr,
> .permission = reiserfs_permission,
> .get_acl = reiserfs_get_acl,
> + .set_acl = reiserfs_set_acl,
> };
> diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
> index dc5236f..8ba707e 100644
> --- a/fs/reiserfs/namei.c
> +++ b/fs/reiserfs/namei.c
> @@ -1522,6 +1522,7 @@ const struct inode_operations reiserfs_dir_inode_operations = {
> .removexattr = reiserfs_removexattr,
> .permission = reiserfs_permission,
> .get_acl = reiserfs_get_acl,
> + .set_acl = reiserfs_set_acl,
> };
>
> /*
> @@ -1539,6 +1540,7 @@ const struct inode_operations reiserfs_symlink_inode_operations = {
> .removexattr = reiserfs_removexattr,
> .permission = reiserfs_permission,
> .get_acl = reiserfs_get_acl,
> + .set_acl = reiserfs_set_acl,
>
> };
>
> @@ -1553,4 +1555,5 @@ const struct inode_operations reiserfs_special_inode_operations = {
> .removexattr = reiserfs_removexattr,
> .permission = reiserfs_permission,
> .get_acl = reiserfs_get_acl,
> + .set_acl = reiserfs_set_acl,
> };
> diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
> index 8a9e2dc..5cdfbd6 100644
> --- a/fs/reiserfs/xattr.c
> +++ b/fs/reiserfs/xattr.c
> @@ -50,6 +50,7 @@
> #include <linux/stat.h>
> #include <linux/quotaops.h>
> #include <linux/security.h>
> +#include <linux/posix_acl_xattr.h>
>
> #define PRIVROOT_NAME ".reiserfs_priv"
> #define XAROOT_NAME "xattrs"
> @@ -904,8 +905,8 @@ static const struct xattr_handler *reiserfs_xattr_handlers[] = {
> &reiserfs_xattr_security_handler,
> #endif
> #ifdef CONFIG_REISERFS_FS_POSIX_ACL
> - &reiserfs_posix_acl_access_handler,
> - &reiserfs_posix_acl_default_handler,
> + &posix_acl_access_xattr_handler,
> + &posix_acl_default_xattr_handler,
> #endif
> NULL
> };
> diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
> index d95c959..ff04988 100644
> --- a/fs/reiserfs/xattr_acl.c
> +++ b/fs/reiserfs/xattr_acl.c
> @@ -11,35 +11,19 @@
> #include "acl.h"
> #include <asm/uaccess.h>
>
> -static int reiserfs_set_acl(struct reiserfs_transaction_handle *th,
> +static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th,
> struct inode *inode, int type,
> struct posix_acl *acl);
>
> -static int
> -reiserfs_posix_acl_set(struct dentry *dentry, const char *name, const void *value,
> - size_t size, int flags, int type)
> +
> +int
> +reiserfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
> {
> - struct inode *inode = dentry->d_inode;
> - struct posix_acl *acl;
> int error, error2;
> struct reiserfs_transaction_handle th;
> size_t jcreate_blocks;
> - if (!reiserfs_posixacl(inode->i_sb))
> - return -EOPNOTSUPP;
> - if (!inode_owner_or_capable(inode))
> - return -EPERM;
> -
> - if (value) {
> - acl = posix_acl_from_xattr(&init_user_ns, value, size);
> - if (IS_ERR(acl)) {
> - return PTR_ERR(acl);
> - } else if (acl) {
> - error = posix_acl_valid(acl);
> - if (error)
> - goto release_and_out;
> - }
> - } else
> - acl = NULL;
> + int size = acl ? posix_acl_xattr_size(acl->a_count) : 0;
> +
>
> /* Pessimism: We can't assume that anything from the xattr root up
> * has been created. */
> @@ -51,7 +35,7 @@ reiserfs_posix_acl_set(struct dentry *dentry, const char *name, const void *valu
> error = journal_begin(&th, inode->i_sb, jcreate_blocks);
> reiserfs_write_unlock(inode->i_sb);
> if (error == 0) {
> - error = reiserfs_set_acl(&th, inode, type, acl);
> + error = __reiserfs_set_acl(&th, inode, type, acl);
> reiserfs_write_lock(inode->i_sb);
> error2 = journal_end(&th, inode->i_sb, jcreate_blocks);
> reiserfs_write_unlock(inode->i_sb);
> @@ -59,29 +43,6 @@ reiserfs_posix_acl_set(struct dentry *dentry, const char *name, const void *valu
> error = error2;
> }
>
> - release_and_out:
> - posix_acl_release(acl);
> - return error;
> -}
> -
> -static int
> -reiserfs_posix_acl_get(struct dentry *dentry, const char *name, void *buffer,
> - size_t size, int type)
> -{
> - struct posix_acl *acl;
> - int error;
> -
> - if (!reiserfs_posixacl(dentry->d_sb))
> - return -EOPNOTSUPP;
> -
> - acl = reiserfs_get_acl(dentry->d_inode, type);
> - if (IS_ERR(acl))
> - return PTR_ERR(acl);
> - if (acl == NULL)
> - return -ENODATA;
> - error = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
> - posix_acl_release(acl);
> -
> return error;
> }
>
> @@ -273,7 +234,7 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
> * BKL held [before 2.5.x]
> */
> static int
> -reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
> +__reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
> int type, struct posix_acl *acl)
> {
> char *name;
> @@ -343,7 +304,7 @@ reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
> struct inode *dir, struct dentry *dentry,
> struct inode *inode)
> {
> - struct posix_acl *acl;
> + struct posix_acl *default_acl, *acl;
> int err = 0;
>
> /* ACLs only get applied to files and directories */
> @@ -363,37 +324,28 @@ reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th,
> goto apply_umask;
> }
>
> - acl = reiserfs_get_acl(dir, ACL_TYPE_DEFAULT);
> - if (IS_ERR(acl))
> - return PTR_ERR(acl);
> + err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
> + if (err)
> + return err;
>
> + if (default_acl) {
> + err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
> + default_acl);
> + posix_acl_release(default_acl);
> + }
> if (acl) {
> - /* Copy the default ACL to the default ACL of a new directory */
> - if (S_ISDIR(inode->i_mode)) {
> - err = reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT,
> - acl);
> - if (err)
> - goto cleanup;
> - }
> -
> - /* Now we reconcile the new ACL and the mode,
> - potentially modifying both */
> - err = __posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
> - if (err < 0)
> - return err;
> -
> - /* If we need an ACL.. */
> - if (err > 0)
> - err = reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS, acl);
> - cleanup:
> + if (!err)
> + err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS,
> + acl);
> posix_acl_release(acl);
> - } else {
> - apply_umask:
> - /* no ACL, apply umask */
> - inode->i_mode &= ~current_umask();
> }
>
> return err;
> +
> + apply_umask:
> + /* no ACL, apply umask */
> + inode->i_mode &= ~current_umask();
> + return err;
> }
>
> /* This is used to cache the default acl before a new object is created.
> @@ -442,84 +394,11 @@ int reiserfs_cache_default_acl(struct inode *inode)
> */
> int reiserfs_acl_chmod(struct inode *inode)
> {
> - struct reiserfs_transaction_handle th;
> - struct posix_acl *acl;
> - size_t size;
> - int error;
> -
> if (IS_PRIVATE(inode))
> return 0;
> -
> - if (S_ISLNK(inode->i_mode))
> - return -EOPNOTSUPP;
> -
> if (get_inode_sd_version(inode) == STAT_DATA_V1 ||
> - !reiserfs_posixacl(inode->i_sb)) {
> + !reiserfs_posixacl(inode->i_sb))
> return 0;
> - }
>
> - acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
> - if (!acl)
> - return 0;
> - if (IS_ERR(acl))
> - return PTR_ERR(acl);
> - error = __posix_acl_chmod(&acl, GFP_NOFS, inode->i_mode);
> - if (error)
> - return error;
> -
> - size = reiserfs_xattr_nblocks(inode, reiserfs_acl_size(acl->a_count));
> - reiserfs_write_lock(inode->i_sb);
> - error = journal_begin(&th, inode->i_sb, size * 2);
> - reiserfs_write_unlock(inode->i_sb);
> - if (!error) {
> - int error2;
> - error = reiserfs_set_acl(&th, inode, ACL_TYPE_ACCESS, acl);
> - reiserfs_write_lock(inode->i_sb);
> - error2 = journal_end(&th, inode->i_sb, size * 2);
> - reiserfs_write_unlock(inode->i_sb);
> - if (error2)
> - error = error2;
> - }
> - posix_acl_release(acl);
> - return error;
> -}
> -
> -static size_t posix_acl_access_list(struct dentry *dentry, char *list,
> - size_t list_size, const char *name,
> - size_t name_len, int type)
> -{
> - const size_t size = sizeof(POSIX_ACL_XATTR_ACCESS);
> - if (!reiserfs_posixacl(dentry->d_sb))
> - return 0;
> - if (list && size <= list_size)
> - memcpy(list, POSIX_ACL_XATTR_ACCESS, size);
> - return size;
> + return posix_acl_chmod(inode);
> }
> -
> -const struct xattr_handler reiserfs_posix_acl_access_handler = {
> - .prefix = POSIX_ACL_XATTR_ACCESS,
> - .flags = ACL_TYPE_ACCESS,
> - .get = reiserfs_posix_acl_get,
> - .set = reiserfs_posix_acl_set,
> - .list = posix_acl_access_list,
> -};
> -
> -static size_t posix_acl_default_list(struct dentry *dentry, char *list,
> - size_t list_size, const char *name,
> - size_t name_len, int type)
> -{
> - const size_t size = sizeof(POSIX_ACL_XATTR_DEFAULT);
> - if (!reiserfs_posixacl(dentry->d_sb))
> - return 0;
> - if (list && size <= list_size)
> - memcpy(list, POSIX_ACL_XATTR_DEFAULT, size);
> - return size;
> -}
> -
> -const struct xattr_handler reiserfs_posix_acl_default_handler = {
> - .prefix = POSIX_ACL_XATTR_DEFAULT,
> - .flags = ACL_TYPE_DEFAULT,
> - .get = reiserfs_posix_acl_get,
> - .set = reiserfs_posix_acl_set,
> - .list = posix_acl_default_list,
> -};
> --
> 1.7.10.4
>
>
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--
Jan Kara <jack@suse.cz>
SUSE Labs, CR