This patch adds ACL support to the ext2 filesystem.
fs/Config.help | 11
fs/Config.in | 1
fs/ext2/Makefile | 4
fs/ext2/acl.c | 573 ++++++++++++++++++++++++++++++++++++++++++++++++
fs/ext2/acl.h | 88 +++++++
fs/ext2/ext2.h | 5
fs/ext2/file.c | 3
fs/ext2/ialloc.c | 37 +--
fs/ext2/inode.c | 22 +
fs/ext2/namei.c | 10
fs/ext2/super.c | 43 +++
fs/ext2/xattr.c | 21 +
include/linux/ext2_fs.h | 1
13 files changed, 797 insertions(+), 22 deletions(-)
diff -Nru a/fs/Config.help b/fs/Config.help
--- a/fs/Config.help Tue Oct 29 09:56:10 2002
+++ b/fs/Config.help Tue Oct 29 09:56:10 2002
@@ -128,7 +128,18 @@
the kernel or by users (see the attr(5) manual page, or visit
<http://acl.bestbits.at/> for details).
+ You need this for POSIX ACL support on ext2.
+
If unsure, say N.
+
+CONFIG_EXT2_FS_POSIX_ACL
+ Posix Access Control Lists (ACLs) support permissions for users and
+ groups beyond the owner/group/world scheme.
+
+ To learn more about Access Control Lists, visit the Posix ACLs for
+ Linux website <http://acl.bestbits.at/>.
+
+ If you don't know what Access Control Lists are, say N.
CONFIG_EXT3_FS
This is the journaling version of the Second extended file system
diff -Nru a/fs/Config.in b/fs/Config.in
--- a/fs/Config.in Tue Oct 29 09:56:10 2002
+++ b/fs/Config.in Tue Oct 29 09:56:10 2002
@@ -98,6 +98,7 @@
tristate 'Second extended fs support' CONFIG_EXT2_FS
dep_mbool ' Ext2 extended attributes' CONFIG_EXT2_FS_XATTR $CONFIG_EXT2_FS
+dep_mbool ' Ext2 POSIX Access Control Lists' CONFIG_EXT2_FS_POSIX_ACL $CONFIG_EXT2_FS_XATTR
tristate 'System V/Xenix/V7/Coherent file system support' CONFIG_SYSV_FS
diff -Nru a/fs/ext2/Makefile b/fs/ext2/Makefile
--- a/fs/ext2/Makefile Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/Makefile Tue Oct 29 09:56:10 2002
@@ -13,4 +13,8 @@
ext2-objs += xattr.o xattr_user.o
endif
+ifeq ($(CONFIG_EXT2_FS_POSIX_ACL),y)
+ext2-objs += acl.o
+endif
+
include $(TOPDIR)/Rules.make
diff -Nru a/fs/ext2/acl.c b/fs/ext2/acl.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/fs/ext2/acl.c Tue Oct 29 09:56:10 2002
@@ -0,0 +1,573 @@
+/*
+ * linux/fs/ext2/acl.c
+ *
+ * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include "ext2.h"
+#include "xattr.h"
+#include "acl.h"
+
+/*
+ * Convert from filesystem to in-memory representation.
+ */
+static struct posix_acl *
+ext2_acl_from_disk(const void *value, size_t size)
+{
+ const char *end = (char *)value + size;
+ int n, count;
+ struct posix_acl *acl;
+
+ if (!value)
+ return NULL;
+ if (size < sizeof(ext2_acl_header))
+ return ERR_PTR(-EINVAL);
+ if (((ext2_acl_header *)value)->a_version !=
+ cpu_to_le32(EXT2_ACL_VERSION))
+ return ERR_PTR(-EINVAL);
+ value = (char *)value + sizeof(ext2_acl_header);
+ count = ext2_acl_count(size);
+ if (count < 0)
+ return ERR_PTR(-EINVAL);
+ if (count == 0)
+ return NULL;
+ acl = posix_acl_alloc(count, GFP_KERNEL);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ for (n=0; n < count; n++) {
+ ext2_acl_entry *entry =
+ (ext2_acl_entry *)value;
+ if ((char *)value + sizeof(ext2_acl_entry_short) > end)
+ goto fail;
+ acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag);
+ acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
+ switch(acl->a_entries[n].e_tag) {
+ case ACL_USER_OBJ:
+ case ACL_GROUP_OBJ:
+ case ACL_MASK:
+ case ACL_OTHER:
+ value = (char *)value +
+ sizeof(ext2_acl_entry_short);
+ acl->a_entries[n].e_id = ACL_UNDEFINED_ID;
+ break;
+
+ case ACL_USER:
+ case ACL_GROUP:
+ value = (char *)value + sizeof(ext2_acl_entry);
+ if ((char *)value > end)
+ goto fail;
+ acl->a_entries[n].e_id =
+ le32_to_cpu(entry->e_id);
+ break;
+
+ default:
+ goto fail;
+ }
+ }
+ if (value != end)
+ goto fail;
+ return acl;
+
+fail:
+ posix_acl_release(acl);
+ return ERR_PTR(-EINVAL);
+}
+
+/*
+ * Convert from in-memory to filesystem representation.
+ */
+static void *
+ext2_acl_to_disk(const struct posix_acl *acl, size_t *size)
+{
+ ext2_acl_header *ext_acl;
+ char *e;
+ int n;
+
+ *size = ext2_acl_size(acl->a_count);
+ ext_acl = (ext2_acl_header *)kmalloc(sizeof(ext2_acl_header) +
+ acl->a_count * sizeof(ext2_acl_entry), GFP_KERNEL);
+ if (!ext_acl)
+ return ERR_PTR(-ENOMEM);
+ ext_acl->a_version = cpu_to_le32(EXT2_ACL_VERSION);
+ e = (char *)ext_acl + sizeof(ext2_acl_header);
+ for (n=0; n < acl->a_count; n++) {
+ ext2_acl_entry *entry = (ext2_acl_entry *)e;
+ entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag);
+ entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm);
+ switch(acl->a_entries[n].e_tag) {
+ case ACL_USER:
+ case ACL_GROUP:
+ entry->e_id =
+ cpu_to_le32(acl->a_entries[n].e_id);
+ e += sizeof(ext2_acl_entry);
+ break;
+
+ case ACL_USER_OBJ:
+ case ACL_GROUP_OBJ:
+ case ACL_MASK:
+ case ACL_OTHER:
+ e += sizeof(ext2_acl_entry_short);
+ break;
+
+ default:
+ goto fail;
+ }
+ }
+ return (char *)ext_acl;
+
+fail:
+ kfree(ext_acl);
+ return ERR_PTR(-EINVAL);
+}
+
+/*
+ * inode->i_sem: down
+ */
+static struct posix_acl *
+ext2_get_acl(struct inode *inode, int type)
+{
+ int name_index;
+ char *value;
+ struct posix_acl *acl, **p_acl;
+ const size_t size = ext2_acl_size(EXT2_ACL_MAX_ENTRIES);
+ int retval;
+
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return 0;
+
+ switch(type) {
+ case ACL_TYPE_ACCESS:
+ p_acl = &EXT2_I(inode)->i_acl;
+ name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ p_acl = &EXT2_I(inode)->i_default_acl;
+ name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
+ break;
+
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+ if (*p_acl != EXT2_ACL_NOT_CACHED)
+ return posix_acl_dup(*p_acl);
+ value = kmalloc(size, GFP_KERNEL);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+
+ retval = ext2_xattr_get(inode, name_index, "", value, size);
+
+ if (retval == -ENODATA || retval == -ENOSYS)
+ *p_acl = acl = NULL;
+ else if (retval < 0)
+ acl = ERR_PTR(retval);
+ else {
+ acl = ext2_acl_from_disk(value, retval);
+ if (!IS_ERR(acl))
+ *p_acl = posix_acl_dup(acl);
+ }
+ kfree(value);
+ return acl;
+}
+
+/*
+ * inode->i_sem: down
+ */
+static int
+ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+ int name_index;
+ void *value = NULL;
+ struct posix_acl **p_acl;
+ size_t size;
+ int error;
+
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return 0;
+
+ switch(type) {
+ case ACL_TYPE_ACCESS:
+ name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
+ p_acl = &EXT2_I(inode)->i_acl;
+ if (acl) {
+ mode_t mode = inode->i_mode;
+ error = posix_acl_equiv_mode(acl, &mode);
+ if (error < 0)
+ return error;
+ else {
+ inode->i_mode = mode;
+ mark_inode_dirty(inode);
+ if (error == 0)
+ acl = NULL;
+ }
+ }
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
+ p_acl = &EXT2_I(inode)->i_default_acl;
+ if (!S_ISDIR(inode->i_mode))
+ return acl ? -EACCES : 0;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ if (acl) {
+ if (acl->a_count > EXT2_ACL_MAX_ENTRIES)
+ return -EINVAL;
+ value = ext2_acl_to_disk(acl, &size);
+ if (IS_ERR(value))
+ return (int)PTR_ERR(value);
+ }
+
+ error = ext2_xattr_set(inode, name_index, "", value, size, 0);
+
+ if (value)
+ kfree(value);
+ if (!error) {
+ if (*p_acl && *p_acl != EXT2_ACL_NOT_CACHED)
+ posix_acl_release(*p_acl);
+ *p_acl = posix_acl_dup(acl);
+ }
+ return error;
+}
+
+static int
+__ext2_permission(struct inode *inode, int mask, int lock)
+{
+ int mode = inode->i_mode;
+
+ /* Nobody gets write access to a read-only fs */
+ if ((mask & MAY_WRITE) && IS_RDONLY(inode) &&
+ (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
+ return -EROFS;
+ /* Nobody gets write access to an immutable file */
+ if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
+ return -EACCES;
+ if (current->fsuid == inode->i_uid) {
+ mode >>= 6;
+ } else if (test_opt(inode->i_sb, POSIX_ACL)) {
+ /* ACL can't contain additional permissions if
+ the ACL_MASK entry is 0 */
+ if (!(mode & S_IRWXG))
+ goto check_groups;
+ if (EXT2_I(inode)->i_acl == EXT2_ACL_NOT_CACHED) {
+ struct posix_acl *acl;
+
+ if (lock) {
+ down(&inode->i_sem);
+ acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
+ up(&inode->i_sem);
+ } else
+ acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
+
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ posix_acl_release(acl);
+ if (EXT2_I(inode)->i_acl == EXT2_ACL_NOT_CACHED)
+ return -EIO;
+ }
+ if (EXT2_I(inode)->i_acl) {
+ int error = posix_acl_permission(inode,
+ EXT2_I(inode)->i_acl, mask);
+ if (error == -EACCES)
+ goto check_capabilities;
+ return error;
+ } else
+ goto check_groups;
+ } else {
+check_groups:
+ if (in_group_p(inode->i_gid))
+ mode >>= 3;
+ }
+ if ((mode & mask & S_IRWXO) == mask)
+ return 0;
+
+check_capabilities:
+ /* Allowed to override Discretionary Access Control? */
+ if ((mask & (MAY_READ|MAY_WRITE)) || (inode->i_mode & S_IXUGO))
+ if (capable(CAP_DAC_OVERRIDE))
+ return 0;
+ /* Read and search granted if capable(CAP_DAC_READ_SEARCH) */
+ if (capable(CAP_DAC_READ_SEARCH) && ((mask == MAY_READ) ||
+ (S_ISDIR(inode->i_mode) && !(mask & MAY_WRITE))))
+ return 0;
+ return -EACCES;
+}
+
+/*
+ * Inode operation permission().
+ *
+ * inode->i_sem: up
+ * BKL held [before 2.5.x]
+ */
+int
+ext2_permission(struct inode *inode, int mask)
+{
+ return __ext2_permission(inode, mask, 1);
+}
+
+/*
+ * Used internally if i_sem is already down.
+ */
+int
+ext2_permission_locked(struct inode *inode, int mask)
+{
+ return __ext2_permission(inode, mask, 0);
+}
+
+/*
+ * Initialize the ACLs of a new inode. Called from ext2_new_inode.
+ *
+ * dir->i_sem: down
+ * inode->i_sem: up (access to inode is still exclusive)
+ * BKL held [before 2.5.x]
+ */
+int
+ext2_init_acl(struct inode *inode, struct inode *dir)
+{
+ struct posix_acl *acl = NULL;
+ int error = 0;
+
+ if (!S_ISLNK(inode->i_mode)) {
+ if (test_opt(dir->i_sb, POSIX_ACL)) {
+ acl = ext2_get_acl(dir, ACL_TYPE_DEFAULT);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ }
+ if (!acl)
+ inode->i_mode &= ~current->fs->umask;
+ }
+ if (test_opt(inode->i_sb, POSIX_ACL) && acl) {
+ struct posix_acl *clone;
+ mode_t mode;
+
+ if (S_ISDIR(inode->i_mode)) {
+ error = ext2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
+ if (error)
+ goto cleanup;
+ }
+ clone = posix_acl_clone(acl, GFP_KERNEL);
+ error = -ENOMEM;
+ if (!clone)
+ goto cleanup;
+ mode = inode->i_mode;
+ error = posix_acl_create_masq(clone, &mode);
+ if (error >= 0) {
+ inode->i_mode = mode;
+ if (error > 0) {
+ /* This is an extended ACL */
+ error = ext2_set_acl(inode,
+ ACL_TYPE_ACCESS, clone);
+ }
+ }
+ posix_acl_release(clone);
+ }
+cleanup:
+ posix_acl_release(acl);
+ return error;
+}
+
+/*
+ * Does chmod for an inode that may have an Access Control List. The
+ * inode->i_mode field must be updated to the desired value by the caller
+ * before calling this function.
+ * Returns 0 on success, or a negative error number.
+ *
+ * We change the ACL rather than storing some ACL entries in the file
+ * mode permission bits (which would be more efficient), because that
+ * would break once additional permissions (like ACL_APPEND, ACL_DELETE
+ * for directories) are added. There are no more bits available in the
+ * file mode.
+ *
+ * inode->i_sem: down
+ * BKL held [before 2.5.x]
+ */
+int
+ext2_acl_chmod(struct inode *inode)
+{
+ struct posix_acl *acl, *clone;
+ int error;
+
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return 0;
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ acl = ext2_get_acl(inode, ACL_TYPE_ACCESS);
+ if (IS_ERR(acl) || !acl)
+ return PTR_ERR(acl);
+ clone = posix_acl_clone(acl, GFP_KERNEL);
+ posix_acl_release(acl);
+ if (!clone)
+ return -ENOMEM;
+ error = posix_acl_chmod_masq(clone, inode->i_mode);
+ if (!error)
+ error = ext2_set_acl(inode, ACL_TYPE_ACCESS, clone);
+ posix_acl_release(clone);
+ return error;
+}
+
+/*
+ * Extended attribut handlers
+ */
+static size_t
+ext2_xattr_list_acl_access(char *list, struct inode *inode,
+ const char *name, int name_len)
+{
+ const size_t len = sizeof(XATTR_NAME_ACL_ACCESS)-1;
+
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return 0;
+ if (list)
+ memcpy(list, XATTR_NAME_ACL_ACCESS, len);
+ return len;
+}
+
+static size_t
+ext2_xattr_list_acl_default(char *list, struct inode *inode,
+ const char *name, int name_len)
+{
+ const size_t len = sizeof(XATTR_NAME_ACL_DEFAULT)-1;
+
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return 0;
+ if (list)
+ memcpy(list, XATTR_NAME_ACL_DEFAULT, len);
+ return len;
+}
+
+static int
+ext2_xattr_get_acl(struct inode *inode, int type, void *buffer, size_t size)
+{
+ struct posix_acl *acl;
+ int error;
+
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return -EOPNOTSUPP;
+
+ acl = ext2_get_acl(inode, type);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+ error = posix_acl_to_xattr(acl, buffer, size);
+ posix_acl_release(acl);
+
+ return error;
+}
+
+static int
+ext2_xattr_get_acl_access(struct inode *inode, const char *name,
+ void *buffer, size_t size)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return ext2_xattr_get_acl(inode, ACL_TYPE_ACCESS, buffer, size);
+}
+
+static int
+ext2_xattr_get_acl_default(struct inode *inode, const char *name,
+ void *buffer, size_t size)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return ext2_xattr_get_acl(inode, ACL_TYPE_DEFAULT, buffer, size);
+}
+
+static int
+ext2_xattr_set_acl(struct inode *inode, int type, const void *value, size_t size)
+{
+ struct posix_acl *acl;
+ int error;
+
+ if (!test_opt(inode->i_sb, POSIX_ACL))
+ return -EOPNOTSUPP;
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (value) {
+ acl = posix_acl_from_xattr(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;
+
+ error = ext2_set_acl(inode, type, acl);
+
+release_and_out:
+ posix_acl_release(acl);
+ return error;
+}
+
+static int
+ext2_xattr_set_acl_access(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return ext2_xattr_set_acl(inode, ACL_TYPE_ACCESS, value, size);
+}
+
+static int
+ext2_xattr_set_acl_default(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ return ext2_xattr_set_acl(inode, ACL_TYPE_DEFAULT, value, size);
+}
+
+struct ext2_xattr_handler ext2_xattr_acl_access_handler = {
+ prefix: XATTR_NAME_ACL_ACCESS,
+ list: ext2_xattr_list_acl_access,
+ get: ext2_xattr_get_acl_access,
+ set: ext2_xattr_set_acl_access,
+};
+
+struct ext2_xattr_handler ext2_xattr_acl_default_handler = {
+ prefix: XATTR_NAME_ACL_DEFAULT,
+ list: ext2_xattr_list_acl_default,
+ get: ext2_xattr_get_acl_default,
+ set: ext2_xattr_set_acl_default,
+};
+
+void
+exit_ext2_acl(void)
+{
+ ext2_xattr_unregister(EXT2_XATTR_INDEX_POSIX_ACL_ACCESS,
+ &ext2_xattr_acl_access_handler);
+ ext2_xattr_unregister(EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT,
+ &ext2_xattr_acl_default_handler);
+}
+
+int __init
+init_ext2_acl(void)
+{
+ int error;
+
+ error = ext2_xattr_register(EXT2_XATTR_INDEX_POSIX_ACL_ACCESS,
+ &ext2_xattr_acl_access_handler);
+ if (error)
+ goto fail;
+ error = ext2_xattr_register(EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT,
+ &ext2_xattr_acl_default_handler);
+ if (error)
+ goto fail;
+ return 0;
+
+fail:
+ exit_ext2_acl();
+ return error;
+}
diff -Nru a/fs/ext2/acl.h b/fs/ext2/acl.h
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/fs/ext2/acl.h Tue Oct 29 09:56:10 2002
@@ -0,0 +1,88 @@
+/*
+ File: fs/ext2/acl.h
+
+ (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+
+#include <linux/xattr_acl.h>
+
+#define EXT2_ACL_VERSION 0x0001
+#define EXT2_ACL_MAX_ENTRIES 32
+
+typedef struct {
+ __u16 e_tag;
+ __u16 e_perm;
+ __u32 e_id;
+} ext2_acl_entry;
+
+typedef struct {
+ __u16 e_tag;
+ __u16 e_perm;
+} ext2_acl_entry_short;
+
+typedef struct {
+ __u32 a_version;
+} ext2_acl_header;
+
+static inline size_t ext2_acl_size(int count)
+{
+ if (count <= 4) {
+ return sizeof(ext2_acl_header) +
+ count * sizeof(ext2_acl_entry_short);
+ } else {
+ return sizeof(ext2_acl_header) +
+ 4 * sizeof(ext2_acl_entry_short) +
+ (count - 4) * sizeof(ext2_acl_entry);
+ }
+}
+
+static inline int ext2_acl_count(size_t size)
+{
+ ssize_t s;
+ size -= sizeof(ext2_acl_header);
+ s = size - 4 * sizeof(ext2_acl_entry_short);
+ if (s < 0) {
+ if (size % sizeof(ext2_acl_entry_short))
+ return -1;
+ return size / sizeof(ext2_acl_entry_short);
+ } else {
+ if (s % sizeof(ext2_acl_entry))
+ return -1;
+ return s / sizeof(ext2_acl_entry) + 4;
+ }
+}
+
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+
+/* Value for inode->u.ext2_i.i_acl and inode->u.ext2_i.i_default_acl
+ if the ACL has not been cached */
+#define EXT2_ACL_NOT_CACHED ((void *)-1)
+
+/* acl.c */
+extern int ext2_permission (struct inode *, int);
+extern int ext2_permission_locked (struct inode *, int);
+extern int ext2_acl_chmod (struct inode *);
+extern int ext2_init_acl (struct inode *, struct inode *);
+
+extern int init_ext2_acl(void);
+extern void exit_ext2_acl(void);
+
+#else
+#include <linux/sched.h>
+#define ext2_permission NULL
+#define ext2_get_acl NULL
+#define ext2_set_acl NULL
+
+static inline int
+ext2_acl_chmod (struct inode *inode)
+{
+ return 0;
+}
+
+static inline int ext2_init_acl (struct inode *inode, struct inode *dir)
+{
+ inode->i_mode &= ~current->fs->umask;
+ return 0;
+}
+#endif
+
diff -Nru a/fs/ext2/ext2.h b/fs/ext2/ext2.h
--- a/fs/ext2/ext2.h Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/ext2.h Tue Oct 29 09:56:10 2002
@@ -20,6 +20,10 @@
__u32 i_prealloc_block;
__u32 i_prealloc_count;
__u32 i_dir_start_lookup;
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ struct posix_acl *i_acl;
+ struct posix_acl *i_default_acl;
+#endif
rwlock_t i_meta_lock;
struct inode vfs_inode;
};
@@ -85,6 +89,7 @@
extern int ext2_sync_inode (struct inode *);
extern void ext2_discard_prealloc (struct inode *);
extern void ext2_truncate (struct inode *);
+extern int ext2_setattr (struct dentry *, struct iattr *);
/* ioctl.c */
extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
diff -Nru a/fs/ext2/file.c b/fs/ext2/file.c
--- a/fs/ext2/file.c Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/file.c Tue Oct 29 09:56:10 2002
@@ -21,6 +21,7 @@
#include <linux/time.h>
#include "ext2.h"
#include "xattr.h"
+#include "acl.h"
/*
* Called when an inode is released. Note that this is different
@@ -60,4 +61,6 @@
.getxattr = ext2_getxattr,
.listxattr = ext2_listxattr,
.removexattr = ext2_removexattr,
+ .setattr = ext2_setattr,
+ .permission = ext2_permission,
};
diff -Nru a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
--- a/fs/ext2/ialloc.c Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/ialloc.c Tue Oct 29 09:56:10 2002
@@ -19,6 +19,7 @@
#include <linux/buffer_head.h>
#include "ext2.h"
#include "xattr.h"
+#include "acl.h"
/*
* ialloc.c contains the inodes allocation and deallocation routines
@@ -302,7 +303,6 @@
struct ext2_super_block * es;
struct ext2_inode_info *ei;
int err;
- struct inode *ret;
sb = dir->i_sb;
inode = new_inode(sb);
@@ -323,7 +323,6 @@
goto fail;
err = -EIO;
- brelse(bitmap_bh);
bitmap_bh = read_inode_bitmap(sb, group);
if (!bitmap_bh)
goto fail2;
@@ -339,6 +338,7 @@
ll_rw_block(WRITE, 1, &bitmap_bh);
wait_on_buffer(bitmap_bh);
}
+ brelse(bitmap_bh);
ino = group * EXT2_INODES_PER_GROUP(sb) + i + 1;
if (ino < EXT2_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
@@ -395,21 +395,27 @@
inode->i_flags |= S_DIRSYNC;
inode->i_generation = EXT2_SB(sb)->s_next_generation++;
insert_inode_hash(inode);
- mark_inode_dirty(inode);
unlock_super(sb);
- ret = inode;
if(DQUOT_ALLOC_INODE(inode)) {
DQUOT_DROP(inode);
- inode->i_flags |= S_NOQUOTA;
- inode->i_nlink = 0;
- iput(inode);
- ret = ERR_PTR(-EDQUOT);
- } else {
- ext2_debug("allocating inode %lu\n", inode->i_ino);
- ext2_preread_inode(inode);
+ goto fail3;
+ }
+ err = ext2_init_acl(inode, dir);
+ if (err) {
+ DQUOT_FREE_INODE(inode);
+ goto fail3;
}
- goto out;
+ mark_inode_dirty(inode);
+ ext2_debug("allocating inode %lu\n", inode->i_ino);
+ ext2_preread_inode(inode);
+ return inode;
+
+fail3:
+ inode->i_flags |= S_NOQUOTA;
+ inode->i_nlink = 0;
+ iput(inode);
+ return ERR_PTR(err);
fail2:
desc = ext2_get_group_desc (sb, group, &bh2);
@@ -423,10 +429,10 @@
unlock_super(sb);
make_bad_inode(inode);
iput(inode);
- ret = ERR_PTR(err);
- goto out;
+ return ERR_PTR(err);
bad_count:
+ brelse(bitmap_bh);
ext2_error (sb, "ext2_new_inode",
"Free inodes count corrupted in group %d",
group);
@@ -439,9 +445,6 @@
desc->bg_free_inodes_count = 0;
mark_buffer_dirty(bh2);
goto repeat;
-out:
- brelse(bitmap_bh);
- return ret;
}
unsigned long ext2_count_free_inodes (struct super_block * sb)
diff -Nru a/fs/ext2/inode.c b/fs/ext2/inode.c
--- a/fs/ext2/inode.c Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/inode.c Tue Oct 29 09:56:10 2002
@@ -22,7 +22,6 @@
* Assorted race fixes, rewrite of ext2_get_block() by Al Viro, 2000
*/
-#include "ext2.h"
#include <linux/smp_lock.h>
#include <linux/time.h>
#include <linux/highuid.h>
@@ -31,6 +30,8 @@
#include <linux/module.h>
#include <linux/buffer_head.h>
#include <linux/mpage.h>
+#include "ext2.h"
+#include "acl.h"
MODULE_AUTHOR("Remy Card and others");
MODULE_DESCRIPTION("Second Extended Filesystem");
@@ -982,6 +983,10 @@
struct ext2_inode * raw_inode = ext2_get_inode(inode->i_sb, ino, &bh);
int n;
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ ei->i_acl = EXT2_ACL_NOT_CACHED;
+ ei->i_default_acl = EXT2_ACL_NOT_CACHED;
+#endif
if (IS_ERR(raw_inode))
goto bad_inode;
@@ -1177,3 +1182,18 @@
{
return ext2_update_inode (inode, 1);
}
+
+int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ error = inode_change_ok(inode, iattr);
+ if (error)
+ return error;
+ inode_setattr(inode, iattr);
+ if (iattr->ia_valid & ATTR_MODE)
+ error = ext2_acl_chmod(inode);
+ return error;
+}
+
diff -Nru a/fs/ext2/namei.c b/fs/ext2/namei.c
--- a/fs/ext2/namei.c Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/namei.c Tue Oct 29 09:56:10 2002
@@ -32,6 +32,7 @@
#include <linux/pagemap.h>
#include "ext2.h"
#include "xattr.h"
+#include "acl.h"
/*
* Couple of helper functions - make the code slightly cleaner.
@@ -138,7 +139,10 @@
struct inode * inode = ext2_new_inode (dir, mode);
int err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
- init_special_inode(inode, mode, rdev);
+ init_special_inode(inode, inode->i_mode, rdev);
+#ifdef CONFIG_EXT2_FS_EXT_ATTR
+ inode->i_op = &ext2_special_inode_operations;
+#endif
mark_inode_dirty(inode);
err = ext2_add_nondir(dentry, inode);
}
@@ -373,6 +377,8 @@
.getxattr = ext2_getxattr,
.listxattr = ext2_listxattr,
.removexattr = ext2_removexattr,
+ .setattr = ext2_setattr,
+ .permission = ext2_permission,
};
struct inode_operations ext2_special_inode_operations = {
@@ -380,4 +386,6 @@
.getxattr = ext2_getxattr,
.listxattr = ext2_listxattr,
.removexattr = ext2_removexattr,
+ .setattr = ext2_setattr,
+ .permission = ext2_permission,
};
diff -Nru a/fs/ext2/super.c b/fs/ext2/super.c
--- a/fs/ext2/super.c Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/super.c Tue Oct 29 09:56:10 2002
@@ -28,7 +28,7 @@
#include <asm/uaccess.h>
#include "ext2.h"
#include "xattr.h"
-
+#include "acl.h"
static void ext2_sync_super(struct super_block *sb,
struct ext2_super_block *es);
@@ -155,6 +155,10 @@
ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL);
if (!ei)
return NULL;
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ ei->i_acl = EXT2_ACL_NOT_CACHED;
+ ei->i_default_acl = EXT2_ACL_NOT_CACHED;
+#endif
return &ei->vfs_inode;
}
@@ -191,6 +195,26 @@
printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n");
}
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+
+static void ext2_clear_inode(struct inode *inode)
+{
+ struct ext2_inode_info *ei = EXT2_I(inode);
+
+ if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) {
+ posix_acl_release(ei->i_acl);
+ ei->i_acl = EXT2_ACL_NOT_CACHED;
+ }
+ if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) {
+ posix_acl_release(ei->i_default_acl);
+ ei->i_default_acl = EXT2_ACL_NOT_CACHED;
+ }
+}
+
+#else
+# define ext2_clear_inode NULL
+#endif
+
static struct super_operations ext2_sops = {
.alloc_inode = ext2_alloc_inode,
.destroy_inode = ext2_destroy_inode,
@@ -202,6 +226,7 @@
.write_super = ext2_write_super,
.statfs = ext2_statfs,
.remount_fs = ext2_remount,
+ .clear_inode = ext2_clear_inode,
};
/* Yes, most of these are left as NULL!!
@@ -287,6 +312,13 @@
clear_opt (sbi->s_mount_opt, XATTR_USER);
else
#endif
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ if (!strcmp(this_char, "acl"))
+ set_opt(sbi->s_mount_opt, POSIX_ACL);
+ else if (!strcmp(this_char, "noacl"))
+ clear_opt(sbi->s_mount_opt, POSIX_ACL);
+ else
+#endif
if (!strcmp (this_char, "bsddf"))
clear_opt (sbi->s_mount_opt, MINIX_DF);
else if (!strcmp (this_char, "nouid32")) {
@@ -571,6 +603,8 @@
set_opt(sbi->s_mount_opt, NO_UID32);
if (def_mount_opts & EXT2_DEFM_XATTR_USER)
set_opt(sbi->s_mount_opt, XATTR_USER);
+ if (def_mount_opts & EXT2_DEFM_ACL)
+ set_opt(sbi->s_mount_opt, POSIX_ACL);
if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
@@ -583,6 +617,10 @@
if (!parse_options ((char *) data, sbi))
goto failed_mount;
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
+ MS_POSIXACL : 0);
+
if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
(EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
@@ -827,6 +865,9 @@
*/
if (!parse_options (data, sbi))
return -EINVAL;
+
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
es = sbi->s_es;
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
diff -Nru a/fs/ext2/xattr.c b/fs/ext2/xattr.c
--- a/fs/ext2/xattr.c Tue Oct 29 09:56:10 2002
+++ b/fs/ext2/xattr.c Tue Oct 29 09:56:10 2002
@@ -60,6 +60,7 @@
#include <asm/semaphore.h>
#include "ext2.h"
#include "xattr.h"
+#include "acl.h"
/* These symbols may be needed by a module. */
EXPORT_SYMBOL(ext2_xattr_register);
@@ -1100,19 +1101,35 @@
err = ext2_xattr_register(EXT2_XATTR_INDEX_USER, &ext2_xattr_user_handler);
if (err)
return err;
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ err = init_ext2_acl();
+ if (err)
+ goto out;
+#endif
ext2_xattr_cache = mb_cache_create("ext2_xattr", NULL,
sizeof(struct mb_cache_entry) +
sizeof(struct mb_cache_entry_index), 1, 6);
if (!ext2_xattr_cache) {
- ext2_xattr_unregister(EXT2_XATTR_INDEX_USER, &ext2_xattr_user_handler);
- return -ENOMEM;
+ err = -ENOMEM;
+ goto out1;
}
return 0;
+out1:
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ exit_ext2_acl();
+out:
+#endif
+ ext2_xattr_unregister(EXT2_XATTR_INDEX_USER,
+ &ext2_xattr_user_handler);
+ return err;
}
void
exit_ext2_xattr(void)
{
mb_cache_destroy(ext2_xattr_cache);
+#ifdef CONFIG_EXT2_FS_POSIX_ACL
+ exit_ext2_acl();
+#endif
ext2_xattr_unregister(EXT2_XATTR_INDEX_USER, &ext2_xattr_user_handler);
}
diff -Nru a/include/linux/ext2_fs.h b/include/linux/ext2_fs.h
--- a/include/linux/ext2_fs.h Tue Oct 29 09:56:10 2002
+++ b/include/linux/ext2_fs.h Tue Oct 29 09:56:10 2002
@@ -308,6 +308,7 @@
#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
#define EXT2_MOUNT_XATTR_USER 0x4000 /* Extended user attributes */
+#define EXT2_MOUNT_POSIX_ACL 0x8000 /* POSIX Access Control Lists */
#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/