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ext4: xattr-in-inode support

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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>
This commit is contained in:
Andreas Dilger 2017-06-21 21:10:32 -04:00 committed by Theodore Ts'o
parent e08ac99fa2
commit e50e5129f3
6 changed files with 604 additions and 56 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

12
fs/ext4/ext4.h
View file

@ -1797,6 +1797,7 @@ EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
EXT4_FEATURE_INCOMPAT_EXTENTS| \
EXT4_FEATURE_INCOMPAT_64BIT| \
EXT4_FEATURE_INCOMPAT_FLEX_BG| \
EXT4_FEATURE_INCOMPAT_EA_INODE| \
EXT4_FEATURE_INCOMPAT_MMP | \
EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
EXT4_FEATURE_INCOMPAT_ENCRYPT | \
@ -2230,6 +2231,12 @@ struct mmpd_data {
*/
#define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
/*
* Maximum size of xattr attributes for FEATURE_INCOMPAT_EA_INODE 1Mb
* This limit is arbitrary, but is reasonable for the xattr API.
*/
#define EXT4_XATTR_MAX_LARGE_EA_SIZE (1024 * 1024)
/*
* Function prototypes
*/
@ -2242,6 +2249,10 @@ struct mmpd_data {
# define ATTRIB_NORET __attribute__((noreturn))
# define NORET_AND noreturn,
struct ext4_xattr_ino_array {
unsigned int xia_count; /* # of used item in the array */
unsigned int xia_inodes[0];
};
/* bitmap.c */
extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
@ -2489,6 +2500,7 @@ extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
extern void ext4_set_inode_flags(struct inode *);
extern int ext4_alloc_da_blocks(struct inode *inode);
extern void ext4_set_aops(struct inode *inode);
extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int chunk);
extern int ext4_writepage_trans_blocks(struct inode *);
extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,

1
fs/ext4/ialloc.c
View file

@ -294,7 +294,6 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
* as writing the quota to disk may need the lock as well.
*/
dquot_initialize(inode);
ext4_xattr_delete_inode(handle, inode);
dquot_free_inode(inode);
dquot_drop(inode);

2
fs/ext4/inline.c
View file

@ -61,7 +61,7 @@ static int get_max_inline_xattr_value_size(struct inode *inode,
/* Compute min_offs. */
for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
if (!entry->e_value_block && entry->e_value_size) {
if (!entry->e_value_inum && entry->e_value_size) {
size_t offs = le16_to_cpu(entry->e_value_offs);
if (offs < min_offs)
min_offs = offs;

49
fs/ext4/inode.c
View file

@ -139,8 +139,6 @@ static void ext4_invalidatepage(struct page *page, unsigned int offset,
unsigned int length);
static int __ext4_journalled_writepage(struct page *page, unsigned int len);
static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh);
static int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
int pextents);
/*
* Test whether an inode is a fast symlink.
@ -189,6 +187,8 @@ void ext4_evict_inode(struct inode *inode)
{
handle_t *handle;
int err;
int extra_credits = 3;
struct ext4_xattr_ino_array *lea_ino_array = NULL;
trace_ext4_evict_inode(inode);
@ -238,8 +238,8 @@ void ext4_evict_inode(struct inode *inode)
* protection against it
*/
sb_start_intwrite(inode->i_sb);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE,
ext4_blocks_for_truncate(inode)+3);
handle = ext4_journal_start(inode, EXT4_HT_TRUNCATE, extra_credits);
if (IS_ERR(handle)) {
ext4_std_error(inode->i_sb, PTR_ERR(handle));
/*
@ -251,9 +251,36 @@ void ext4_evict_inode(struct inode *inode)
sb_end_intwrite(inode->i_sb);
goto no_delete;
}
if (IS_SYNC(inode))
ext4_handle_sync(handle);
/*
* Delete xattr inode before deleting the main inode.
*/
err = ext4_xattr_delete_inode(handle, inode, &lea_ino_array);
if (err) {
ext4_warning(inode->i_sb,
"couldn't delete inode's xattr (err %d)", err);
goto stop_handle;
}
if (!IS_NOQUOTA(inode))
extra_credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb);
if (!ext4_handle_has_enough_credits(handle,
ext4_blocks_for_truncate(inode) + extra_credits)) {
err = ext4_journal_extend(handle,
ext4_blocks_for_truncate(inode) + extra_credits);
if (err > 0)
err = ext4_journal_restart(handle,
ext4_blocks_for_truncate(inode) + extra_credits);
if (err != 0) {
ext4_warning(inode->i_sb,
"couldn't extend journal (err %d)", err);
goto stop_handle;
}
}
inode->i_size = 0;
err = ext4_mark_inode_dirty(handle, inode);
if (err) {
@ -277,10 +304,10 @@ void ext4_evict_inode(struct inode *inode)
* enough credits left in the handle to remove the inode from
* the orphan list and set the dtime field.
*/
if (!ext4_handle_has_enough_credits(handle, 3)) {
err = ext4_journal_extend(handle, 3);
if (!ext4_handle_has_enough_credits(handle, extra_credits)) {
err = ext4_journal_extend(handle, extra_credits);
if (err > 0)
err = ext4_journal_restart(handle, 3);
err = ext4_journal_restart(handle, extra_credits);
if (err != 0) {
ext4_warning(inode->i_sb,
"couldn't extend journal (err %d)", err);
@ -315,8 +342,12 @@ void ext4_evict_inode(struct inode *inode)
ext4_clear_inode(inode);
else
ext4_free_inode(handle, inode);
ext4_journal_stop(handle);
sb_end_intwrite(inode->i_sb);
if (lea_ino_array != NULL)
ext4_xattr_inode_array_free(inode, lea_ino_array);
return;
no_delete:
ext4_clear_inode(inode); /* We must guarantee clearing of inode... */
@ -5504,7 +5535,7 @@ static int ext4_index_trans_blocks(struct inode *inode, int lblocks,
*
* Also account for superblock, inode, quota and xattr blocks
*/
static int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
int ext4_meta_trans_blocks(struct inode *inode, int lblocks,
int pextents)
{
ext4_group_t groups, ngroups = ext4_get_groups_count(inode->i_sb);

563
fs/ext4/xattr.c
View file

@ -177,9 +177,8 @@ ext4_xattr_check_entries(struct ext4_xattr_entry *entry, void *end,
/* Check the values */
while (!IS_LAST_ENTRY(entry)) {
if (entry->e_value_block != 0)
return -EFSCORRUPTED;
if (entry->e_value_size != 0) {
if (entry->e_value_size != 0 &&
entry->e_value_inum == 0) {
u16 offs = le16_to_cpu(entry->e_value_offs);
u32 size = le32_to_cpu(entry->e_value_size);
void *value;
@ -269,6 +268,99 @@ ext4_xattr_find_entry(struct ext4_xattr_entry **pentry, int name_index,
return cmp ? -ENODATA : 0;
}
/*
* Read the EA value from an inode.
*/
static int
ext4_xattr_inode_read(struct inode *ea_inode, void *buf, size_t *size)
{
unsigned long block = 0;
struct buffer_head *bh = NULL;
int blocksize;
size_t csize, ret_size = 0;
if (*size == 0)
return 0;
blocksize = ea_inode->i_sb->s_blocksize;
while (ret_size < *size) {
csize = (*size - ret_size) > blocksize ? blocksize :
*size - ret_size;
bh = ext4_bread(NULL, ea_inode, block, 0);
if (IS_ERR(bh)) {
*size = ret_size;
return PTR_ERR(bh);
}
memcpy(buf, bh->b_data, csize);
brelse(bh);
buf += csize;
block += 1;
ret_size += csize;
}
*size = ret_size;
return 0;
}
struct inode *ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, int *err)
{
struct inode *ea_inode = NULL;
ea_inode = ext4_iget(parent->i_sb, ea_ino);
if (IS_ERR(ea_inode) || is_bad_inode(ea_inode)) {
int rc = IS_ERR(ea_inode) ? PTR_ERR(ea_inode) : 0;
ext4_error(parent->i_sb, "error while reading EA inode %lu "
"/ %d %d", ea_ino, rc, is_bad_inode(ea_inode));
*err = rc != 0 ? rc : -EIO;
return NULL;
}
if (EXT4_XATTR_INODE_GET_PARENT(ea_inode) != parent->i_ino ||
ea_inode->i_generation != parent->i_generation) {
ext4_error(parent->i_sb, "Backpointer from EA inode %lu "
"to parent invalid.", ea_ino);
*err = -EINVAL;
goto error;
}
if (!(EXT4_I(ea_inode)->i_flags & EXT4_EA_INODE_FL)) {
ext4_error(parent->i_sb, "EA inode %lu does not have "
"EXT4_EA_INODE_FL flag set.\n", ea_ino);
*err = -EINVAL;
goto error;
}
*err = 0;
return ea_inode;
error:
iput(ea_inode);
return NULL;
}
/*
* Read the value from the EA inode.
*/
static int
ext4_xattr_inode_get(struct inode *inode, unsigned long ea_ino, void *buffer,
size_t *size)
{
struct inode *ea_inode = NULL;
int err;
ea_inode = ext4_xattr_inode_iget(inode, ea_ino, &err);
if (err)
return err;
err = ext4_xattr_inode_read(ea_inode, buffer, size);
iput(ea_inode);
return err;
}
static int
ext4_xattr_block_get(struct inode *inode, int name_index, const char *name,
void *buffer, size_t buffer_size)
@ -308,8 +400,16 @@ ext4_xattr_block_get(struct inode *inode, int name_index, const char *name,
error = -ERANGE;
if (size > buffer_size)
goto cleanup;
memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs),
size);
if (entry->e_value_inum) {
error = ext4_xattr_inode_get(inode,
le32_to_cpu(entry->e_value_inum),
buffer, &size);
if (error)
goto cleanup;
} else {
memcpy(buffer, bh->b_data +
le16_to_cpu(entry->e_value_offs), size);
}
}
error = size;
@ -350,8 +450,16 @@ ext4_xattr_ibody_get(struct inode *inode, int name_index, const char *name,
error = -ERANGE;
if (size > buffer_size)
goto cleanup;
memcpy(buffer, (void *)IFIRST(header) +
le16_to_cpu(entry->e_value_offs), size);
if (entry->e_value_inum) {
error = ext4_xattr_inode_get(inode,
le32_to_cpu(entry->e_value_inum),
buffer, &size);
if (error)
goto cleanup;
} else {
memcpy(buffer, (void *)IFIRST(header) +
le16_to_cpu(entry->e_value_offs), size);
}
}
error = size;
@ -620,7 +728,7 @@ static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last,
size_t *min_offs, void *base, int *total)
{
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
if (last->e_value_size) {
if (!last->e_value_inum && last->e_value_size) {
size_t offs = le16_to_cpu(last->e_value_offs);
if (offs < *min_offs)
*min_offs = offs;
@ -631,16 +739,171 @@ static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last,
return (*min_offs - ((void *)last - base) - sizeof(__u32));
}
static int
ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
/*
* Write the value of the EA in an inode.
*/
static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode,
const void *buf, int bufsize)
{
struct buffer_head *bh = NULL;
unsigned long block = 0;
unsigned blocksize = ea_inode->i_sb->s_blocksize;
unsigned max_blocks = (bufsize + blocksize - 1) >> ea_inode->i_blkbits;
int csize, wsize = 0;
int ret = 0;
int retries = 0;
retry:
while (ret >= 0 && ret < max_blocks) {
struct ext4_map_blocks map;
map.m_lblk = block += ret;
map.m_len = max_blocks -= ret;
ret = ext4_map_blocks(handle, ea_inode, &map,
EXT4_GET_BLOCKS_CREATE);
if (ret <= 0) {
ext4_mark_inode_dirty(handle, ea_inode);
if (ret == -ENOSPC &&
ext4_should_retry_alloc(ea_inode->i_sb, &retries)) {
ret = 0;
goto retry;
}
break;
}
}
if (ret < 0)
return ret;
block = 0;
while (wsize < bufsize) {
if (bh != NULL)
brelse(bh);
csize = (bufsize - wsize) > blocksize ? blocksize :
bufsize - wsize;
bh = ext4_getblk(handle, ea_inode, block, 0);
if (IS_ERR(bh))
return PTR_ERR(bh);
ret = ext4_journal_get_write_access(handle, bh);
if (ret)
goto out;
memcpy(bh->b_data, buf, csize);
set_buffer_uptodate(bh);
ext4_handle_dirty_metadata(handle, ea_inode, bh);
buf += csize;
wsize += csize;
block += 1;
}
inode_lock(ea_inode);
i_size_write(ea_inode, wsize);
ext4_update_i_disksize(ea_inode, wsize);
inode_unlock(ea_inode);
ext4_mark_inode_dirty(handle, ea_inode);
out:
brelse(bh);
return ret;
}
/*
* Create an inode to store the value of a large EA.
*/
static struct inode *ext4_xattr_inode_create(handle_t *handle,
struct inode *inode)
{
struct inode *ea_inode = NULL;
/*
* Let the next inode be the goal, so we try and allocate the EA inode
* in the same group, or nearby one.
*/
ea_inode = ext4_new_inode(handle, inode->i_sb->s_root->d_inode,
S_IFREG | 0600, NULL, inode->i_ino + 1, NULL);
if (!IS_ERR(ea_inode)) {
ea_inode->i_op = &ext4_file_inode_operations;
ea_inode->i_fop = &ext4_file_operations;
ext4_set_aops(ea_inode);
ea_inode->i_generation = inode->i_generation;
EXT4_I(ea_inode)->i_flags |= EXT4_EA_INODE_FL;
/*
* A back-pointer from EA inode to parent inode will be useful
* for e2fsck.
*/
EXT4_XATTR_INODE_SET_PARENT(ea_inode, inode->i_ino);
unlock_new_inode(ea_inode);
}
return ea_inode;
}
/*
* Unlink the inode storing the value of the EA.
*/
int ext4_xattr_inode_unlink(struct inode *inode, unsigned long ea_ino)
{
struct inode *ea_inode = NULL;
int err;
ea_inode = ext4_xattr_inode_iget(inode, ea_ino, &err);
if (err)
return err;
clear_nlink(ea_inode);
iput(ea_inode);
return 0;
}
/*
* Add value of the EA in an inode.
*/
static int ext4_xattr_inode_set(handle_t *handle, struct inode *inode,
unsigned long *ea_ino, const void *value,
size_t value_len)
{
struct inode *ea_inode;
int err;
/* Create an inode for the EA value */
ea_inode = ext4_xattr_inode_create(handle, inode);
if (IS_ERR(ea_inode))
return PTR_ERR(ea_inode);
err = ext4_xattr_inode_write(handle, ea_inode, value, value_len);
if (err)
clear_nlink(ea_inode);
else
*ea_ino = ea_inode->i_ino;
iput(ea_inode);
return err;
}
static int ext4_xattr_set_entry(struct ext4_xattr_info *i,
struct ext4_xattr_search *s,
handle_t *handle, struct inode *inode)
{
struct ext4_xattr_entry *last;
size_t free, min_offs = s->end - s->base, name_len = strlen(i->name);
int in_inode = i->in_inode;
int rc;
if (ext4_has_feature_ea_inode(inode->i_sb) &&
(EXT4_XATTR_SIZE(i->value_len) >
EXT4_XATTR_MIN_LARGE_EA_SIZE(inode->i_sb->s_blocksize)))
in_inode = 1;
/* Compute min_offs and last. */
last = s->first;
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
if (last->e_value_size) {
if (!last->e_value_inum && last->e_value_size) {
size_t offs = le16_to_cpu(last->e_value_offs);
if (offs < min_offs)
min_offs = offs;
@ -648,15 +911,20 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
}
free = min_offs - ((void *)last - s->base) - sizeof(__u32);
if (!s->not_found) {
if (s->here->e_value_size) {
if (!in_inode &&
!s->here->e_value_inum && s->here->e_value_size) {
size_t size = le32_to_cpu(s->here->e_value_size);
free += EXT4_XATTR_SIZE(size);
}
free += EXT4_XATTR_LEN(name_len);
}
if (i->value) {
if (free < EXT4_XATTR_LEN(name_len) +
EXT4_XATTR_SIZE(i->value_len))
size_t value_len = EXT4_XATTR_SIZE(i->value_len);
if (in_inode)
value_len = 0;
if (free < EXT4_XATTR_LEN(name_len) + value_len)
return -ENOSPC;
}
@ -670,7 +938,8 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
s->here->e_name_len = name_len;
memcpy(s->here->e_name, i->name, name_len);
} else {
if (s->here->e_value_size) {
if (!s->here->e_value_inum && s->here->e_value_size &&
s->here->e_value_offs > 0) {
void *first_val = s->base + min_offs;
size_t offs = le16_to_cpu(s->here->e_value_offs);
void *val = s->base + offs;
@ -704,12 +973,18 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
last = s->first;
while (!IS_LAST_ENTRY(last)) {
size_t o = le16_to_cpu(last->e_value_offs);
if (last->e_value_size && o < offs)
if (!last->e_value_inum &&
last->e_value_size && o < offs)
last->e_value_offs =
cpu_to_le16(o + size);
last = EXT4_XATTR_NEXT(last);
}
}
if (s->here->e_value_inum) {
ext4_xattr_inode_unlink(inode,
le32_to_cpu(s->here->e_value_inum));
s->here->e_value_inum = 0;
}
if (!i->value) {
/* Remove the old name. */
size_t size = EXT4_XATTR_LEN(name_len);
@ -722,11 +997,20 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
if (i->value) {
/* Insert the new value. */
s->here->e_value_size = cpu_to_le32(i->value_len);
if (i->value_len) {
if (in_inode) {
unsigned long ea_ino =
le32_to_cpu(s->here->e_value_inum);
rc = ext4_xattr_inode_set(handle, inode, &ea_ino,
i->value, i->value_len);
if (rc)
goto out;
s->here->e_value_inum = cpu_to_le32(ea_ino);
s->here->e_value_offs = 0;
} else if (i->value_len) {
size_t size = EXT4_XATTR_SIZE(i->value_len);
void *val = s->base + min_offs - size;
s->here->e_value_offs = cpu_to_le16(min_offs - size);
s->here->e_value_inum = 0;
if (i->value == EXT4_ZERO_XATTR_VALUE) {
memset(val, 0, size);
} else {
@ -736,8 +1020,11 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
memcpy(val, i->value, i->value_len);
}
}
s->here->e_value_size = cpu_to_le32(i->value_len);
}
return 0;
out:
return rc;
}
struct ext4_xattr_block_find {
@ -801,8 +1088,6 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
#define header(x) ((struct ext4_xattr_header *)(x))
if (i->value && i->value_len > sb->s_blocksize)
return -ENOSPC;
if (s->base) {
BUFFER_TRACE(bs->bh, "get_write_access");
error = ext4_journal_get_write_access(handle, bs->bh);
@ -821,7 +1106,7 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
mb_cache_entry_delete_block(ext4_mb_cache, hash,
bs->bh->b_blocknr);
ea_bdebug(bs->bh, "modifying in-place");
error = ext4_xattr_set_entry(i, s);
error = ext4_xattr_set_entry(i, s, handle, inode);
if (!error) {
if (!IS_LAST_ENTRY(s->first))
ext4_xattr_rehash(header(s->base),
@ -870,7 +1155,7 @@ ext4_xattr_block_set(handle_t *handle, struct inode *inode,
s->end = s->base + sb->s_blocksize;
}
error = ext4_xattr_set_entry(i, s);
error = ext4_xattr_set_entry(i, s, handle, inode);
if (error == -EFSCORRUPTED)
goto bad_block;
if (error)
@ -1070,7 +1355,7 @@ int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
if (EXT4_I(inode)->i_extra_isize == 0)
return -ENOSPC;
error = ext4_xattr_set_entry(i, s);
error = ext4_xattr_set_entry(i, s, handle, inode);
if (error) {
if (error == -ENOSPC &&
ext4_has_inline_data(inode)) {
@ -1082,7 +1367,7 @@ int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
error = ext4_xattr_ibody_find(inode, i, is);
if (error)
return error;
error = ext4_xattr_set_entry(i, s);
error = ext4_xattr_set_entry(i, s, handle, inode);
}
if (error)
return error;
@ -1098,7 +1383,7 @@ int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
return 0;
}
static int ext4_xattr_ibody_set(struct inode *inode,
static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode,
struct ext4_xattr_info *i,
struct ext4_xattr_ibody_find *is)
{
@ -1108,7 +1393,7 @@ static int ext4_xattr_ibody_set(struct inode *inode,
if (EXT4_I(inode)->i_extra_isize == 0)
return -ENOSPC;
error = ext4_xattr_set_entry(i, s);
error = ext4_xattr_set_entry(i, s, handle, inode);
if (error)
return error;
header = IHDR(inode, ext4_raw_inode(&is->iloc));
@ -1155,7 +1440,7 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
.name = name,
.value = value,
.value_len = value_len,
.in_inode = 0,
};
struct ext4_xattr_ibody_find is = {
.s = { .not_found = -ENODATA, },
@ -1204,7 +1489,7 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
}
if (!value) {
if (!is.s.not_found)
error = ext4_xattr_ibody_set(inode, &i, &is);
error = ext4_xattr_ibody_set(handle, inode, &i, &is);
else if (!bs.s.not_found)
error = ext4_xattr_block_set(handle, inode, &i, &bs);
} else {
@ -1215,7 +1500,7 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i))
goto cleanup;
error = ext4_xattr_ibody_set(inode, &i, &is);
error = ext4_xattr_ibody_set(handle, inode, &i, &is);
if (!error && !bs.s.not_found) {
i.value = NULL;
error = ext4_xattr_block_set(handle, inode, &i, &bs);
@ -1226,11 +1511,20 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
goto cleanup;
}
error = ext4_xattr_block_set(handle, inode, &i, &bs);
if (ext4_has_feature_ea_inode(inode->i_sb) &&
error == -ENOSPC) {
/* xattr not fit to block, store at external
* inode */
i.in_inode = 1;
error = ext4_xattr_ibody_set(handle, inode,
&i, &is);
}
if (error)
goto cleanup;
if (!is.s.not_found) {
i.value = NULL;
error = ext4_xattr_ibody_set(inode, &i, &is);
error = ext4_xattr_ibody_set(handle, inode, &i,
&is);
}
}
}
@ -1269,12 +1563,26 @@ ext4_xattr_set(struct inode *inode, int name_index, const char *name,
const void *value, size_t value_len, int flags)
{
handle_t *handle;
struct super_block *sb = inode->i_sb;
int error, retries = 0;
int credits = ext4_jbd2_credits_xattr(inode);
error = dquot_initialize(inode);
if (error)
return error;
if ((value_len >= EXT4_XATTR_MIN_LARGE_EA_SIZE(sb->s_blocksize)) &&
ext4_has_feature_ea_inode(sb)) {
int nrblocks = (value_len + sb->s_blocksize - 1) >>
sb->s_blocksize_bits;
/* For new inode */
credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3;
/* For data blocks of EA inode */
credits += ext4_meta_trans_blocks(inode, nrblocks, 0);
}
retry:
handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits);
if (IS_ERR(handle)) {
@ -1286,7 +1594,7 @@ ext4_xattr_set(struct inode *inode, int name_index, const char *name,
value, value_len, flags);
error2 = ext4_journal_stop(handle);
if (error == -ENOSPC &&
ext4_should_retry_alloc(inode->i_sb, &retries))
ext4_should_retry_alloc(sb, &retries))
goto retry;
if (error == 0)
error = error2;
@ -1311,7 +1619,7 @@ static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry,
/* Adjust the value offsets of the entries */
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
if (last->e_value_size) {
if (!last->e_value_inum && last->e_value_size) {
new_offs = le16_to_cpu(last->e_value_offs) +
value_offs_shift;
last->e_value_offs = cpu_to_le16(new_offs);
@ -1372,7 +1680,7 @@ static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
goto out;
/* Remove the chosen entry from the inode */
error = ext4_xattr_ibody_set(inode, &i, is);
error = ext4_xattr_ibody_set(handle, inode, &i, is);
if (error)
goto out;
@ -1572,21 +1880,135 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
}
#define EIA_INCR 16 /* must be 2^n */
#define EIA_MASK (EIA_INCR - 1)
/* Add the large xattr @ino into @lea_ino_array for later deletion.
* If @lea_ino_array is new or full it will be grown and the old
* contents copied over.
*/
static int
ext4_expand_ino_array(struct ext4_xattr_ino_array **lea_ino_array, __u32 ino)
{
if (*lea_ino_array == NULL) {
/*
* Start with 15 inodes, so it fits into a power-of-two size.
* If *lea_ino_array is NULL, this is essentially offsetof()
*/
(*lea_ino_array) =
kmalloc(offsetof(struct ext4_xattr_ino_array,
xia_inodes[EIA_MASK]),
GFP_NOFS);
if (*lea_ino_array == NULL)
return -ENOMEM;
(*lea_ino_array)->xia_count = 0;
} else if (((*lea_ino_array)->xia_count & EIA_MASK) == EIA_MASK) {
/* expand the array once all 15 + n * 16 slots are full */
struct ext4_xattr_ino_array *new_array = NULL;
int count = (*lea_ino_array)->xia_count;
/* if new_array is NULL, this is essentially offsetof() */
new_array = kmalloc(
offsetof(struct ext4_xattr_ino_array,
xia_inodes[count + EIA_INCR]),
GFP_NOFS);
if (new_array == NULL)
return -ENOMEM;
memcpy(new_array, *lea_ino_array,
offsetof(struct ext4_xattr_ino_array,
xia_inodes[count]));
kfree(*lea_ino_array);
*lea_ino_array = new_array;
}
(*lea_ino_array)->xia_inodes[(*lea_ino_array)->xia_count++] = ino;
return 0;
}
/**
* Add xattr inode to orphan list
*/
static int
ext4_xattr_inode_orphan_add(handle_t *handle, struct inode *inode,
int credits, struct ext4_xattr_ino_array *lea_ino_array)
{
struct inode *ea_inode = NULL;
int idx = 0, error = 0;
if (lea_ino_array == NULL)
return 0;
for (; idx < lea_ino_array->xia_count; ++idx) {
if (!ext4_handle_has_enough_credits(handle, credits)) {
error = ext4_journal_extend(handle, credits);
if (error > 0)
error = ext4_journal_restart(handle, credits);
if (error != 0) {
ext4_warning(inode->i_sb,
"couldn't extend journal "
"(err %d)", error);
return error;
}
}
ea_inode = ext4_xattr_inode_iget(inode,
lea_ino_array->xia_inodes[idx], &error);
if (error)
continue;
ext4_orphan_add(handle, ea_inode);
/* the inode's i_count will be released by caller */
}
return 0;
}
/*
* ext4_xattr_delete_inode()
*
* Free extended attribute resources associated with this inode. This
* Free extended attribute resources associated with this inode. Traverse
* all entries and unlink any xattr inodes associated with this inode. This
* is called immediately before an inode is freed. We have exclusive
* access to the inode.
* access to the inode. If an orphan inode is deleted it will also delete any
* xattr block and all xattr inodes. They are checked by ext4_xattr_inode_iget()
* to ensure they belong to the parent inode and were not deleted already.
*/
void
ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
int
ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
struct ext4_xattr_ino_array **lea_ino_array)
{
struct buffer_head *bh = NULL;
struct ext4_xattr_ibody_header *header;
struct ext4_inode *raw_inode;
struct ext4_iloc iloc;
struct ext4_xattr_entry *entry;
int credits = 3, error = 0;
if (!EXT4_I(inode)->i_file_acl)
if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
goto delete_external_ea;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
goto cleanup;
raw_inode = ext4_raw_inode(&iloc);
header = IHDR(inode, raw_inode);
for (entry = IFIRST(header); !IS_LAST_ENTRY(entry);
entry = EXT4_XATTR_NEXT(entry)) {
if (!entry->e_value_inum)
continue;
if (ext4_expand_ino_array(lea_ino_array,
entry->e_value_inum) != 0) {
brelse(iloc.bh);
goto cleanup;
}
entry->e_value_inum = 0;
}
brelse(iloc.bh);
delete_external_ea:
if (!EXT4_I(inode)->i_file_acl) {
/* add xattr inode to orphan list */
ext4_xattr_inode_orphan_add(handle, inode, credits,
*lea_ino_array);
goto cleanup;
}
bh = sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl);
if (!bh) {
EXT4_ERROR_INODE(inode, "block %llu read error",
@ -1599,11 +2021,69 @@ ext4_xattr_delete_inode(handle_t *handle, struct inode *inode)
EXT4_I(inode)->i_file_acl);
goto cleanup;
}
for (entry = BFIRST(bh); !IS_LAST_ENTRY(entry);
entry = EXT4_XATTR_NEXT(entry)) {
if (!entry->e_value_inum)
continue;
if (ext4_expand_ino_array(lea_ino_array,
entry->e_value_inum) != 0)
goto cleanup;
entry->e_value_inum = 0;
}
/* add xattr inode to orphan list */
error = ext4_xattr_inode_orphan_add(handle, inode, credits,
*lea_ino_array);
if (error != 0)
goto cleanup;
if (!IS_NOQUOTA(inode))
credits += 2 * EXT4_QUOTA_DEL_BLOCKS(inode->i_sb);
if (!ext4_handle_has_enough_credits(handle, credits)) {
error = ext4_journal_extend(handle, credits);
if (error > 0)
error = ext4_journal_restart(handle, credits);
if (error != 0) {
ext4_warning(inode->i_sb,
"couldn't extend journal (err %d)", error);
goto cleanup;
}
}
ext4_xattr_release_block(handle, inode, bh);
EXT4_I(inode)->i_file_acl = 0;
cleanup:
brelse(bh);
return error;
}
void
ext4_xattr_inode_array_free(struct inode *inode,
struct ext4_xattr_ino_array *lea_ino_array)
{
struct inode *ea_inode = NULL;
int idx = 0;
int err;
if (lea_ino_array == NULL)
return;
for (; idx < lea_ino_array->xia_count; ++idx) {
ea_inode = ext4_xattr_inode_iget(inode,
lea_ino_array->xia_inodes[idx], &err);
if (err)
continue;
/* for inode's i_count get from ext4_xattr_delete_inode */
if (!list_empty(&EXT4_I(ea_inode)->i_orphan))
iput(ea_inode);
clear_nlink(ea_inode);
iput(ea_inode);
}
kfree(lea_ino_array);
}
/*
@ -1655,10 +2135,9 @@ ext4_xattr_cmp(struct ext4_xattr_header *header1,
entry1->e_name_index != entry2->e_name_index ||
entry1->e_name_len != entry2->e_name_len ||
entry1->e_value_size != entry2->e_value_size ||
entry1->e_value_inum != entry2->e_value_inum ||
memcmp(entry1->e_name, entry2->e_name, entry1->e_name_len))
return 1;
if (entry1->e_value_block != 0 || entry2->e_value_block != 0)
return -EFSCORRUPTED;
if (memcmp((char *)header1 + le16_to_cpu(entry1->e_value_offs),
(char *)header2 + le16_to_cpu(entry2->e_value_offs),
le32_to_cpu(entry1->e_value_size)))
@ -1730,7 +2209,7 @@ static inline void ext4_xattr_hash_entry(struct ext4_xattr_header *header,
*name++;
}
if (entry->e_value_size != 0) {
if (!entry->e_value_inum && entry->e_value_size) {
__le32 *value = (__le32 *)((char *)header +
le16_to_cpu(entry->e_value_offs));
for (n = (le32_to_cpu(entry->e_value_size) +

33
fs/ext4/xattr.h
View file

@ -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);