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ubifs: introduce Kconfig symbol for xattr support

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Allow to disable extended attribute support.

This aids in reliability testing, especially since some xattr
related bugs have surfaced.

Also an embedded system might not need it, so this allows for a
slightly smaller kernel (about 4KiB).

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Stefan Agner 2018-07-31 15:13:20 +02:00 committed by Richard Weinberger
parent 1bf0572fe2
commit 7e5471ce6d
6 changed files with 29 additions and 3 deletions
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15
fs/ubifs/Kconfig
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@ -51,9 +51,20 @@ config UBIFS_ATIME_SUPPORT
If unsure, say 'N'
config UBIFS_FS_XATTR
bool "UBIFS XATTR support"
depends on UBIFS_FS
default y
help
Saying Y here includes support for extended attributes (xattrs).
Xattrs are name:value pairs associated with inodes by
the kernel or by users (see the attr(5) manual page).
If unsure, say Y.
config UBIFS_FS_ENCRYPTION
bool "UBIFS Encryption"
depends on UBIFS_FS && BLOCK
depends on UBIFS_FS && UBIFS_FS_XATTR && BLOCK
select FS_ENCRYPTION
default n
help
@ -64,7 +75,7 @@ config UBIFS_FS_ENCRYPTION
config UBIFS_FS_SECURITY
bool "UBIFS Security Labels"
depends on UBIFS_FS
depends on UBIFS_FS && UBIFS_FS_XATTR
default y
help
Security labels provide an access control facility to support Linux

3
fs/ubifs/Makefile
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@ -4,6 +4,7 @@ obj-$(CONFIG_UBIFS_FS) += ubifs.o
ubifs-y += shrinker.o journal.o file.o dir.o super.o sb.o io.o
ubifs-y += tnc.o master.o scan.o replay.o log.o commit.o gc.o orphan.o
ubifs-y += budget.o find.o tnc_commit.o compress.o lpt.o lprops.o
ubifs-y += recovery.o ioctl.o lpt_commit.o tnc_misc.o xattr.o debug.o
ubifs-y += recovery.o ioctl.o lpt_commit.o tnc_misc.o debug.o
ubifs-y += misc.o
ubifs-$(CONFIG_UBIFS_FS_ENCRYPTION) += crypto.o
ubifs-$(CONFIG_UBIFS_FS_XATTR) += xattr.o

2
fs/ubifs/dir.c
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@ -1648,7 +1648,9 @@ const struct inode_operations ubifs_dir_inode_operations = {
.rename = ubifs_rename,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
#ifdef CONFIG_UBIFS_FS_XATTR
.listxattr = ubifs_listxattr,
#endif
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif

4
fs/ubifs/file.c
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@ -1653,7 +1653,9 @@ const struct address_space_operations ubifs_file_address_operations = {
const struct inode_operations ubifs_file_inode_operations = {
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
#ifdef CONFIG_UBIFS_FS_XATTR
.listxattr = ubifs_listxattr,
#endif
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif
@ -1663,7 +1665,9 @@ const struct inode_operations ubifs_symlink_inode_operations = {
.get_link = ubifs_get_link,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
#ifdef CONFIG_UBIFS_FS_XATTR
.listxattr = ubifs_listxattr,
#endif
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif

2
fs/ubifs/super.c
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@ -2053,7 +2053,9 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
if (c->max_inode_sz > MAX_LFS_FILESIZE)
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
sb->s_op = &ubifs_super_operations;
#ifdef CONFIG_UBIFS_FS_XATTR
sb->s_xattr = ubifs_xattr_handlers;
#endif
#ifdef CONFIG_UBIFS_FS_ENCRYPTION
sb->s_cop = &ubifs_crypt_operations;
#endif

6
fs/ubifs/ubifs.h
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@ -1755,7 +1755,13 @@ int ubifs_xattr_set(struct inode *host, const char *name, const void *value,
size_t size, int flags, bool check_lock);
ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf,
size_t size);
#ifdef CONFIG_UBIFS_FS_XATTR
void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum);
#else
static inline void ubifs_evict_xattr_inode(struct ubifs_info *c,
ino_t xattr_inum) { }
#endif
#ifdef CONFIG_UBIFS_FS_SECURITY
extern int ubifs_init_security(struct inode *dentry, struct inode *inode,