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ocfs2: Add incompatible flag for extended attribute 

This patch adds the s_incompat flag for extended attribute support. This
helps us ensure that older versions of Ocfs2 or ocfs2-tools will not be able
to mount a volume with xattr support.

Signed-off-by: Tiger Yang <tiger.yang@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
hifive-unleashed-5.1
Tiger Yang 2008-08-18 17:11:46 +08:00 committed by Mark Fasheh
parent a394425643
commit 8154da3d21
4 changed files with 34 additions and 7 deletions
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7
fs/ocfs2/ocfs2.h
View File

@ -363,6 +363,13 @@ static inline int ocfs2_supports_inline_data(struct ocfs2_super *osb)
return 0;
}
static inline int ocfs2_supports_xattr(struct ocfs2_super *osb)
{
if (osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR)
return 1;
return 0;
}
/* set / clear functions because cluster events can make these happen
* in parallel so we want the transitions to be atomic. this also
* means that any future flags osb_flags must be protected by spinlock

19
fs/ocfs2/ocfs2_fs.h
View File

@ -91,7 +91,8 @@
| OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC \
| OCFS2_FEATURE_INCOMPAT_INLINE_DATA \
| OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP \
| OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK)
| OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK \
| OCFS2_FEATURE_INCOMPAT_XATTR)
#define OCFS2_FEATURE_RO_COMPAT_SUPP OCFS2_FEATURE_RO_COMPAT_UNWRITTEN
/*
@ -128,10 +129,6 @@
/* Support for data packed into inode blocks */
#define OCFS2_FEATURE_INCOMPAT_INLINE_DATA 0x0040
/* Support for the extended slot map */
#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
/*
* Support for alternate, userspace cluster stacks. If set, the superblock
* field s_cluster_info contains a tag for the alternate stack in use as
@ -143,6 +140,12 @@
*/
#define OCFS2_FEATURE_INCOMPAT_USERSPACE_STACK 0x0080
/* Support for the extended slot map */
#define OCFS2_FEATURE_INCOMPAT_EXTENDED_SLOT_MAP 0x100
/* Support for extended attributes */
#define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
/*
* backup superblock flag is used to indicate that this volume
* has backup superblocks.
@ -578,7 +581,11 @@ struct ocfs2_super_block {
/*A0*/ struct ocfs2_cluster_info s_cluster_info; /* Selected userspace
stack. Only valid
with INCOMPAT flag. */
/*B8*/ __le64 s_reserved2[17]; /* Fill out superblock */
/*B8*/ __le16 s_xattr_inline_size; /* extended attribute inline size
for this fs*/
__le16 s_reserved0;
__le32 s_reserved1;
/*C0*/ __le64 s_reserved2[16]; /* Fill out superblock */
/*140*/
/*

3
fs/ocfs2/super.c
View File

@ -1437,7 +1437,8 @@ static int ocfs2_initialize_super(struct super_block *sb,
osb->slot_num = OCFS2_INVALID_SLOT;
osb->s_xattr_inline_size = OCFS2_MIN_XATTR_INLINE_SIZE;
osb->s_xattr_inline_size = le16_to_cpu(
di->id2.i_super.s_xattr_inline_size);
osb->local_alloc_state = OCFS2_LA_UNUSED;
osb->local_alloc_bh = NULL;

12
fs/ocfs2/xattr.c
View File

@ -564,6 +564,9 @@ ssize_t ocfs2_listxattr(struct dentry *dentry,
struct ocfs2_dinode *di = NULL;
struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
return -EOPNOTSUPP;
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
return ret;
@ -843,6 +846,9 @@ int ocfs2_xattr_get(struct inode *inode,
.not_found = -ENODATA,
};
if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
return -EOPNOTSUPP;
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
ret = -ENODATA;
@ -1541,6 +1547,9 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
handle_t *handle;
int ret;
if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
return 0;
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
return 0;
@ -1977,6 +1986,9 @@ int ocfs2_xattr_set(struct inode *inode,
.not_found = -ENODATA,
};
if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
return -EOPNOTSUPP;
ret = ocfs2_inode_lock(inode, &di_bh, 1);
if (ret < 0) {
mlog_errno(ret);