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authorAndreas Dilger <andreas.dilger@intel.com>2017-06-22 04:10:32 +0300
committerTheodore Ts'o <tytso@mit.edu>2017-06-22 04:10:32 +0300
commite50e5129f384ae282adebfb561189cdb19b81cee (patch)
treed386e2df251f3faa23af1236f8c129bb6ea25b9d /fs/ext4/xattr.h
parente08ac99fa2a25626f573cfa377ef3ddedf2cfe8f (diff)
downloadlinux-e50e5129f384ae282adebfb561189cdb19b81cee.tar.xz
ext4: xattr-in-inode support
Large xattr support is implemented for EXT4_FEATURE_INCOMPAT_EA_INODE. If the size of an xattr value is larger than will fit in a single external block, then the xattr value will be saved into the body of an external xattr inode. The also helps support a larger number of xattr, since only the headers will be stored in the in-inode space or the single external block. The inode is referenced from the xattr header via "e_value_inum", which was formerly "e_value_block", but that field was never used. The e_value_size still contains the xattr size so that listing xattrs does not need to look up the inode if the data is not accessed. struct ext4_xattr_entry { __u8 e_name_len; /* length of name */ __u8 e_name_index; /* attribute name index */ __le16 e_value_offs; /* offset in disk block of value */ __le32 e_value_inum; /* inode in which value is stored */ __le32 e_value_size; /* size of attribute value */ __le32 e_hash; /* hash value of name and value */ char e_name[0]; /* attribute name */ }; The xattr inode is marked with the EXT4_EA_INODE_FL flag and also holds a back-reference to the owning inode in its i_mtime field, allowing the ext4/e2fsck to verify the correct inode is accessed. [ Applied fix by Dan Carpenter to avoid freeing an ERR_PTR. ] Lustre-Jira: https://jira.hpdd.intel.com/browse/LU-80 Lustre-bugzilla: https://bugzilla.lustre.org/show_bug.cgi?id=4424 Signed-off-by: Kalpak Shah <kalpak.shah@sun.com> Signed-off-by: James Simmons <uja.ornl@gmail.com> Signed-off-by: Andreas Dilger <andreas.dilger@intel.com> Signed-off-by: Tahsin Erdogan <tahsin@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Diffstat (limited to 'fs/ext4/xattr.h')
-rw-r--r--fs/ext4/xattr.h33
1 files changed, 30 insertions, 3 deletions
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index 099c8b670ef5..6e10ff9393d4 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -44,7 +44,7 @@ struct ext4_xattr_entry {
__u8 e_name_len; /* length of name */
__u8 e_name_index; /* attribute name index */
__le16 e_value_offs; /* offset in disk block of value */
- __le32 e_value_block; /* disk block attribute is stored on (n/i) */
+ __le32 e_value_inum; /* inode in which the value is stored */
__le32 e_value_size; /* size of attribute value */
__le32 e_hash; /* hash value of name and value */
char e_name[0]; /* attribute name */
@@ -69,6 +69,26 @@ struct ext4_xattr_entry {
EXT4_I(inode)->i_extra_isize))
#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))
+/*
+ * Link EA inode back to parent one using i_mtime field.
+ * Extra integer type conversion added to ignore higher
+ * bits in i_mtime.tv_sec which might be set by ext4_get()
+ */
+#define EXT4_XATTR_INODE_SET_PARENT(inode, inum) \
+do { \
+ (inode)->i_mtime.tv_sec = inum; \
+} while(0)
+
+#define EXT4_XATTR_INODE_GET_PARENT(inode) \
+((__u32)(inode)->i_mtime.tv_sec)
+
+/*
+ * The minimum size of EA value when you start storing it in an external inode
+ * size of block - size of header - size of 1 entry - 4 null bytes
+*/
+#define EXT4_XATTR_MIN_LARGE_EA_SIZE(b) \
+ ((b) - EXT4_XATTR_LEN(3) - sizeof(struct ext4_xattr_header) - 4)
+
#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))
#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))
#define BFIRST(bh) ENTRY(BHDR(bh)+1)
@@ -77,10 +97,11 @@ struct ext4_xattr_entry {
#define EXT4_ZERO_XATTR_VALUE ((void *)-1)
struct ext4_xattr_info {
- int name_index;
const char *name;
const void *value;
size_t value_len;
+ int name_index;
+ int in_inode;
};
struct ext4_xattr_search {
@@ -140,7 +161,13 @@ extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
-extern void ext4_xattr_delete_inode(handle_t *, struct inode *);
+extern struct inode *ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino,
+ int *err);
+extern int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino);
+extern int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
+ struct ext4_xattr_ino_array **array);
+extern void ext4_xattr_inode_array_free(struct inode *inode,
+ struct ext4_xattr_ino_array *array);
extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
struct ext4_inode *raw_inode, handle_t *handle);