* [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper
2023-05-18 2:45 [PATCH v3 0/5] erofs: cleanup of xattr handling Jingbo Xu
@ 2023-05-18 2:45 ` Jingbo Xu
2023-05-29 7:41 ` Gao Xiang
2023-05-18 2:45 ` [PATCH v3 2/5] erofs: unify xattr_iter structures Jingbo Xu
` (3 subsequent siblings)
4 siblings, 1 reply; 10+ messages in thread
From: Jingbo Xu @ 2023-05-18 2:45 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
Introduce erofs_xattr_iter_fixup_aligned() helper where
it.ofs <= EROFS_BLKSIZ is mandatory.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 79 +++++++++++++++++++++---------------------------
1 file changed, 35 insertions(+), 44 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index bbfe7ce170d2..b79be2a556ba 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -29,6 +29,28 @@ struct xattr_iter {
unsigned int ofs;
};
+static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
+{
+ if (it->ofs < it->sb->s_blocksize)
+ return 0;
+
+ it->blkaddr += erofs_blknr(it->sb, it->ofs);
+ it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, EROFS_KMAP);
+ if (IS_ERR(it->kaddr))
+ return PTR_ERR(it->kaddr);
+ it->ofs = erofs_blkoff(it->sb, it->ofs);
+ return 0;
+}
+
+static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
+{
+ if (it->ofs > it->sb->s_blocksize) {
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
+ }
+ return erofs_xattr_iter_fixup(it);
+}
+
static int erofs_init_inode_xattrs(struct inode *inode)
{
struct erofs_inode *const vi = EROFS_I(inode);
@@ -80,6 +102,7 @@ static int erofs_init_inode_xattrs(struct inode *inode)
goto out_unlock;
}
+ it.sb = sb;
it.buf = __EROFS_BUF_INITIALIZER;
it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize);
it.ofs = erofs_blkoff(sb, erofs_iloc(inode) + vi->inode_isize);
@@ -105,19 +128,11 @@ static int erofs_init_inode_xattrs(struct inode *inode)
it.ofs += sizeof(struct erofs_xattr_ibody_header);
for (i = 0; i < vi->xattr_shared_count; ++i) {
- if (it.ofs >= sb->s_blocksize) {
- /* cannot be unaligned */
- DBG_BUGON(it.ofs != sb->s_blocksize);
-
- it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr,
- EROFS_KMAP);
- if (IS_ERR(it.kaddr)) {
- kfree(vi->xattr_shared_xattrs);
- vi->xattr_shared_xattrs = NULL;
- ret = PTR_ERR(it.kaddr);
- goto out_unlock;
- }
- it.ofs = 0;
+ ret = erofs_xattr_iter_fixup_aligned(&it);
+ if (ret) {
+ kfree(vi->xattr_shared_xattrs);
+ vi->xattr_shared_xattrs = NULL;
+ goto out_unlock;
}
vi->xattr_shared_xattrs[i] =
le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs));
@@ -150,20 +165,6 @@ struct xattr_iter_handlers {
unsigned int len);
};
-static inline int xattr_iter_fixup(struct xattr_iter *it)
-{
- if (it->ofs < it->sb->s_blocksize)
- return 0;
-
- it->blkaddr += erofs_blknr(it->sb, it->ofs);
- it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
- EROFS_KMAP);
- if (IS_ERR(it->kaddr))
- return PTR_ERR(it->kaddr);
- it->ofs = erofs_blkoff(it->sb, it->ofs);
- return 0;
-}
-
static int inline_xattr_iter_begin(struct xattr_iter *it,
struct inode *inode)
{
@@ -201,7 +202,7 @@ static int xattr_foreach(struct xattr_iter *it,
int err;
/* 0. fixup blkaddr, ofs, ipage */
- err = xattr_iter_fixup(it);
+ err = erofs_xattr_iter_fixup(it);
if (err)
return err;
@@ -236,14 +237,9 @@ static int xattr_foreach(struct xattr_iter *it,
processed = 0;
while (processed < entry.e_name_len) {
- if (it->ofs >= it->sb->s_blocksize) {
- DBG_BUGON(it->ofs > it->sb->s_blocksize);
-
- err = xattr_iter_fixup(it);
- if (err)
- goto out;
- it->ofs = 0;
- }
+ err = erofs_xattr_iter_fixup_aligned(it);
+ if (err)
+ goto out;
slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
entry.e_name_len - processed);
@@ -271,14 +267,9 @@ static int xattr_foreach(struct xattr_iter *it,
}
while (processed < value_sz) {
- if (it->ofs >= it->sb->s_blocksize) {
- DBG_BUGON(it->ofs > it->sb->s_blocksize);
-
- err = xattr_iter_fixup(it);
- if (err)
- goto out;
- it->ofs = 0;
- }
+ err = erofs_xattr_iter_fixup_aligned(it);
+ if (err)
+ goto out;
slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
value_sz - processed);
--
2.19.1.6.gb485710b
^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper
2023-05-18 2:45 ` [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper Jingbo Xu
@ 2023-05-29 7:41 ` Gao Xiang
2023-05-30 3:42 ` Jingbo Xu
0 siblings, 1 reply; 10+ messages in thread
From: Gao Xiang @ 2023-05-29 7:41 UTC (permalink / raw)
To: Jingbo Xu, xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
Hi,
On 2023/5/18 10:45, Jingbo Xu wrote:
> Introduce erofs_xattr_iter_fixup_aligned() helper where
> it.ofs <= EROFS_BLKSIZ is mandatory.
>
> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
> ---
> fs/erofs/xattr.c | 79 +++++++++++++++++++++---------------------------
> 1 file changed, 35 insertions(+), 44 deletions(-)
>
> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
> index bbfe7ce170d2..b79be2a556ba 100644
> --- a/fs/erofs/xattr.c
> +++ b/fs/erofs/xattr.c
> @@ -29,6 +29,28 @@ struct xattr_iter {
> unsigned int ofs;
> };
>
> +static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
> +{
> + if (it->ofs < it->sb->s_blocksize)
> + return 0;
> +
> + it->blkaddr += erofs_blknr(it->sb, it->ofs);
> + it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, EROFS_KMAP);
could we use a new buf interface to init_metabuf at once?
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> + it->ofs = erofs_blkoff(it->sb, it->ofs);
> + return 0;
> +}
> +
> +static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
Since we're doing cleanup, this name sounds confusing to me
since here the meaning is actually "we don't allow pos >
blksize", IOWs, any pos <= blksize is allowed here, so
'aligned' is not accurate.
Could we think out a better one?
Thanks,
Gao Xiang
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper
2023-05-29 7:41 ` Gao Xiang
@ 2023-05-30 3:42 ` Jingbo Xu
2023-05-30 3:47 ` Gao Xiang
0 siblings, 1 reply; 10+ messages in thread
From: Jingbo Xu @ 2023-05-30 3:42 UTC (permalink / raw)
To: Gao Xiang, xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
On 5/29/23 3:41 PM, Gao Xiang wrote:
> Hi,
>
> On 2023/5/18 10:45, Jingbo Xu wrote:
>> Introduce erofs_xattr_iter_fixup_aligned() helper where
>> it.ofs <= EROFS_BLKSIZ is mandatory.
>>
>> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
>> ---
>> fs/erofs/xattr.c | 79 +++++++++++++++++++++---------------------------
>> 1 file changed, 35 insertions(+), 44 deletions(-)
>>
>> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
>> index bbfe7ce170d2..b79be2a556ba 100644
>> --- a/fs/erofs/xattr.c
>> +++ b/fs/erofs/xattr.c
>> @@ -29,6 +29,28 @@ struct xattr_iter {
>> unsigned int ofs;
>> };
>> +static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
>> +{
>> + if (it->ofs < it->sb->s_blocksize)
>> + return 0;
>> +
>> + it->blkaddr += erofs_blknr(it->sb, it->ofs);
>> + it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
>> EROFS_KMAP);
>
> could we use a new buf interface to init_metabuf at once?
As discussed offline, I think the following unified API is preferred:
```
int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan)
{
if (it->ofs < it->sb->s_blocksize)
return 0;
if (nospan && it->ofs != it->sb->s_blocksize) {
DBG_BUGON(1);
return -EFSCORRUPTED;
}
...
}
```
--
Thanks,
Jingbo
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper
2023-05-30 3:42 ` Jingbo Xu
@ 2023-05-30 3:47 ` Gao Xiang
0 siblings, 0 replies; 10+ messages in thread
From: Gao Xiang @ 2023-05-30 3:47 UTC (permalink / raw)
To: Jingbo Xu, xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
On 2023/5/30 11:42, Jingbo Xu wrote:
>
>
> On 5/29/23 3:41 PM, Gao Xiang wrote:
>> Hi,
>>
>> On 2023/5/18 10:45, Jingbo Xu wrote:
>>> Introduce erofs_xattr_iter_fixup_aligned() helper where
>>> it.ofs <= EROFS_BLKSIZ is mandatory.
>>>
>>> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
>>> ---
>>> fs/erofs/xattr.c | 79 +++++++++++++++++++++---------------------------
>>> 1 file changed, 35 insertions(+), 44 deletions(-)
>>>
>>> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
>>> index bbfe7ce170d2..b79be2a556ba 100644
>>> --- a/fs/erofs/xattr.c
>>> +++ b/fs/erofs/xattr.c
>>> @@ -29,6 +29,28 @@ struct xattr_iter {
>>> unsigned int ofs;
>>> };
>>> +static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
>>> +{
>>> + if (it->ofs < it->sb->s_blocksize)
>>> + return 0;
>>> +
>>> + it->blkaddr += erofs_blknr(it->sb, it->ofs);
>>> + it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
>>> EROFS_KMAP);
>>
>> could we use a new buf interface to init_metabuf at once?
>
> As discussed offline, I think the following unified API is preferred:
>
> ```
> int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan)
>
> {
> if (it->ofs < it->sb->s_blocksize)
> return 0;
>
> if (nospan && it->ofs != it->sb->s_blocksize) {
> DBG_BUGON(1);
> return -EFSCORRUPTED;
> }
>
> ...
> }
> ```
Yeah, could you send the next version for this?
Thanks,
Gao Xiang
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v3 2/5] erofs: unify xattr_iter structures
2023-05-18 2:45 [PATCH v3 0/5] erofs: cleanup of xattr handling Jingbo Xu
2023-05-18 2:45 ` [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper Jingbo Xu
@ 2023-05-18 2:45 ` Jingbo Xu
2023-05-30 3:55 ` Gao Xiang
2023-05-18 2:45 ` [PATCH v3 3/5] erofs: make the size of read data stored in buffer_ofs Jingbo Xu
` (2 subsequent siblings)
4 siblings, 1 reply; 10+ messages in thread
From: Jingbo Xu @ 2023-05-18 2:45 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
Unify xattr_iter/listxattr_iter/getxattr_iter structures into
erofs_xattr_iter structure.
This is in preparation for the following further cleanup.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 172 ++++++++++++++++++++---------------------------
1 file changed, 72 insertions(+), 100 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index b79be2a556ba..1e44aa108134 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -20,16 +20,22 @@ static inline unsigned int erofs_xattr_blkoff(struct super_block *sb,
return erofs_blkoff(sb, xattr_id * sizeof(__u32));
}
-struct xattr_iter {
+struct erofs_xattr_iter {
struct super_block *sb;
struct erofs_buf buf;
void *kaddr;
-
erofs_blk_t blkaddr;
unsigned int ofs;
+
+ char *buffer;
+ int buffer_size, buffer_ofs;
+
+ int index, infix_len;
+ struct qstr name;
+ struct dentry *dentry;
};
-static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
+static inline int erofs_xattr_iter_fixup(struct erofs_xattr_iter *it)
{
if (it->ofs < it->sb->s_blocksize)
return 0;
@@ -42,7 +48,7 @@ static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
return 0;
}
-static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
+static inline int erofs_xattr_iter_fixup_aligned(struct erofs_xattr_iter *it)
{
if (it->ofs > it->sb->s_blocksize) {
DBG_BUGON(1);
@@ -54,7 +60,7 @@ static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
static int erofs_init_inode_xattrs(struct inode *inode)
{
struct erofs_inode *const vi = EROFS_I(inode);
- struct xattr_iter it;
+ struct erofs_xattr_iter it;
unsigned int i;
struct erofs_xattr_ibody_header *ih;
struct super_block *sb = inode->i_sb;
@@ -157,15 +163,15 @@ static int erofs_init_inode_xattrs(struct inode *inode)
* and need to be handled
*/
struct xattr_iter_handlers {
- int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry);
- int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf,
+ int (*entry)(struct erofs_xattr_iter *it, struct erofs_xattr_entry *entry);
+ int (*name)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
unsigned int len);
- int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz);
- void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf,
+ int (*alloc_buffer)(struct erofs_xattr_iter *it, unsigned int value_sz);
+ void (*value)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
unsigned int len);
};
-static int inline_xattr_iter_begin(struct xattr_iter *it,
+static int inline_xattr_iter_begin(struct erofs_xattr_iter *it,
struct inode *inode)
{
struct erofs_inode *const vi = EROFS_I(inode);
@@ -193,7 +199,7 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
* Regardless of success or failure, `xattr_foreach' will end up with
* `ofs' pointing to the next xattr item rather than an arbitrary position.
*/
-static int xattr_foreach(struct xattr_iter *it,
+static int xattr_foreach(struct erofs_xattr_iter *it,
const struct xattr_iter_handlers *op,
unsigned int *tlimit)
{
@@ -284,18 +290,10 @@ static int xattr_foreach(struct xattr_iter *it,
return err < 0 ? err : 0;
}
-struct getxattr_iter {
- struct xattr_iter it;
-
- char *buffer;
- int buffer_size, index, infix_len;
- struct qstr name;
-};
-
-static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
+static int erofs_xattr_long_entrymatch(struct erofs_xattr_iter *it,
struct erofs_xattr_entry *entry)
{
- struct erofs_sb_info *sbi = EROFS_SB(it->it.sb);
+ struct erofs_sb_info *sbi = EROFS_SB(it->sb);
struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
(entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
@@ -313,11 +311,9 @@ static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
return 0;
}
-static int xattr_entrymatch(struct xattr_iter *_it,
+static int xattr_entrymatch(struct erofs_xattr_iter *it,
struct erofs_xattr_entry *entry)
{
- struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
-
/* should also match the infix for long name prefixes */
if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX)
return erofs_xattr_long_entrymatch(it, entry);
@@ -329,32 +325,27 @@ static int xattr_entrymatch(struct xattr_iter *_it,
return 0;
}
-static int xattr_namematch(struct xattr_iter *_it,
+static int xattr_namematch(struct erofs_xattr_iter *it,
unsigned int processed, char *buf, unsigned int len)
{
- struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
-
if (memcmp(buf, it->name.name + it->infix_len + processed, len))
return -ENOATTR;
return 0;
}
-static int xattr_checkbuffer(struct xattr_iter *_it,
+static int xattr_checkbuffer(struct erofs_xattr_iter *it,
unsigned int value_sz)
{
- struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
int err = it->buffer_size < value_sz ? -ERANGE : 0;
it->buffer_size = value_sz;
return !it->buffer ? 1 : err;
}
-static void xattr_copyvalue(struct xattr_iter *_it,
+static void xattr_copyvalue(struct erofs_xattr_iter *it,
unsigned int processed,
char *buf, unsigned int len)
{
- struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
-
memcpy(it->buffer + processed, buf, len);
}
@@ -365,41 +356,40 @@ static const struct xattr_iter_handlers find_xattr_handlers = {
.value = xattr_copyvalue
};
-static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
+static int inline_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
{
int ret;
unsigned int remaining;
- ret = inline_xattr_iter_begin(&it->it, inode);
+ ret = inline_xattr_iter_begin(it, inode);
if (ret < 0)
return ret;
remaining = ret;
while (remaining) {
- ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining);
+ ret = xattr_foreach(it, &find_xattr_handlers, &remaining);
if (ret != -ENOATTR)
break;
}
return ret ? ret : it->buffer_size;
}
-static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
+static int shared_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
{
struct erofs_inode *const vi = EROFS_I(inode);
- struct super_block *const sb = it->it.sb;
+ struct super_block *const sb = it->sb;
unsigned int i, xsid;
int ret = -ENOATTR;
for (i = 0; i < vi->xattr_shared_count; ++i) {
xsid = vi->xattr_shared_xattrs[i];
- it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
- it->it.ofs = erofs_xattr_blkoff(sb, xsid);
- it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
- it->it.blkaddr, EROFS_KMAP);
- if (IS_ERR(it->it.kaddr))
- return PTR_ERR(it->it.kaddr);
-
- ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL);
+ it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
+ it->ofs = erofs_xattr_blkoff(sb, xsid);
+ it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
+ if (IS_ERR(it->kaddr))
+ return PTR_ERR(it->kaddr);
+
+ ret = xattr_foreach(it, &find_xattr_handlers, NULL);
if (ret != -ENOATTR)
break;
}
@@ -421,31 +411,30 @@ int erofs_getxattr(struct inode *inode, int index,
void *buffer, size_t buffer_size)
{
int ret;
- struct getxattr_iter it;
+ struct erofs_xattr_iter it;
if (!name)
return -EINVAL;
+ if (strlen(name) > EROFS_NAME_LEN)
+ return -ERANGE;
ret = erofs_init_inode_xattrs(inode);
if (ret)
return ret;
- it.index = index;
- it.name.len = strlen(name);
- if (it.name.len > EROFS_NAME_LEN)
- return -ERANGE;
-
- it.it.buf = __EROFS_BUF_INITIALIZER;
- it.name.name = name;
-
- it.buffer = buffer;
- it.buffer_size = buffer_size;
+ it = (struct erofs_xattr_iter) {
+ .buf = __EROFS_BUF_INITIALIZER,
+ .sb = inode->i_sb,
+ .name = QSTR_INIT(name, strlen(name)),
+ .index = index,
+ .buffer = buffer,
+ .buffer_size = buffer_size,
+ };
- it.it.sb = inode->i_sb;
ret = inline_getxattr(inode, &it);
if (ret == -ENOATTR)
ret = shared_getxattr(inode, &it);
- erofs_put_metabuf(&it.it.buf);
+ erofs_put_metabuf(&it.buf);
return ret;
}
@@ -491,25 +480,15 @@ const struct xattr_handler *erofs_xattr_handlers[] = {
NULL,
};
-struct listxattr_iter {
- struct xattr_iter it;
-
- struct dentry *dentry;
- char *buffer;
- int buffer_size, buffer_ofs;
-};
-
-static int xattr_entrylist(struct xattr_iter *_it,
+static int xattr_entrylist(struct erofs_xattr_iter *it,
struct erofs_xattr_entry *entry)
{
- struct listxattr_iter *it =
- container_of(_it, struct listxattr_iter, it);
unsigned int base_index = entry->e_name_index;
unsigned int prefix_len, infix_len = 0;
const char *prefix, *infix = NULL;
if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
- struct erofs_sb_info *sbi = EROFS_SB(_it->sb);
+ struct erofs_sb_info *sbi = EROFS_SB(it->sb);
struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
(entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
@@ -541,23 +520,17 @@ static int xattr_entrylist(struct xattr_iter *_it,
return 0;
}
-static int xattr_namelist(struct xattr_iter *_it,
+static int xattr_namelist(struct erofs_xattr_iter *it,
unsigned int processed, char *buf, unsigned int len)
{
- struct listxattr_iter *it =
- container_of(_it, struct listxattr_iter, it);
-
memcpy(it->buffer + it->buffer_ofs, buf, len);
it->buffer_ofs += len;
return 0;
}
-static int xattr_skipvalue(struct xattr_iter *_it,
+static int xattr_skipvalue(struct erofs_xattr_iter *it,
unsigned int value_sz)
{
- struct listxattr_iter *it =
- container_of(_it, struct listxattr_iter, it);
-
it->buffer[it->buffer_ofs++] = '\0';
return 1;
}
@@ -569,42 +542,41 @@ static const struct xattr_iter_handlers list_xattr_handlers = {
.value = NULL
};
-static int inline_listxattr(struct listxattr_iter *it)
+static int inline_listxattr(struct erofs_xattr_iter *it)
{
int ret;
unsigned int remaining;
- ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry));
+ ret = inline_xattr_iter_begin(it, d_inode(it->dentry));
if (ret < 0)
return ret;
remaining = ret;
while (remaining) {
- ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining);
+ ret = xattr_foreach(it, &list_xattr_handlers, &remaining);
if (ret)
break;
}
return ret ? ret : it->buffer_ofs;
}
-static int shared_listxattr(struct listxattr_iter *it)
+static int shared_listxattr(struct erofs_xattr_iter *it)
{
struct inode *const inode = d_inode(it->dentry);
struct erofs_inode *const vi = EROFS_I(inode);
- struct super_block *const sb = it->it.sb;
+ struct super_block *const sb = it->sb;
unsigned int i, xsid;
int ret = 0;
for (i = 0; i < vi->xattr_shared_count; ++i) {
xsid = vi->xattr_shared_xattrs[i];
- it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
- it->it.ofs = erofs_xattr_blkoff(sb, xsid);
- it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
- it->it.blkaddr, EROFS_KMAP);
- if (IS_ERR(it->it.kaddr))
- return PTR_ERR(it->it.kaddr);
-
- ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL);
+ it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
+ it->ofs = erofs_xattr_blkoff(sb, xsid);
+ it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
+ if (IS_ERR(it->kaddr))
+ return PTR_ERR(it->kaddr);
+
+ ret = xattr_foreach(it, &list_xattr_handlers, NULL);
if (ret)
break;
}
@@ -615,7 +587,7 @@ ssize_t erofs_listxattr(struct dentry *dentry,
char *buffer, size_t buffer_size)
{
int ret;
- struct listxattr_iter it;
+ struct erofs_xattr_iter it;
ret = erofs_init_inode_xattrs(d_inode(dentry));
if (ret == -ENOATTR)
@@ -623,18 +595,18 @@ ssize_t erofs_listxattr(struct dentry *dentry,
if (ret)
return ret;
- it.it.buf = __EROFS_BUF_INITIALIZER;
- it.dentry = dentry;
- it.buffer = buffer;
- it.buffer_size = buffer_size;
- it.buffer_ofs = 0;
-
- it.it.sb = dentry->d_sb;
+ it = (struct erofs_xattr_iter) {
+ .buf = __EROFS_BUF_INITIALIZER,
+ .sb = dentry->d_sb,
+ .dentry = dentry,
+ .buffer = buffer,
+ .buffer_size = buffer_size,
+ };
ret = inline_listxattr(&it);
if (ret >= 0 || ret == -ENOATTR)
ret = shared_listxattr(&it);
- erofs_put_metabuf(&it.it.buf);
+ erofs_put_metabuf(&it.buf);
return ret;
}
--
2.19.1.6.gb485710b
^ permalink raw reply related [flat|nested] 10+ messages in thread* Re: [PATCH v3 2/5] erofs: unify xattr_iter structures
2023-05-18 2:45 ` [PATCH v3 2/5] erofs: unify xattr_iter structures Jingbo Xu
@ 2023-05-30 3:55 ` Gao Xiang
0 siblings, 0 replies; 10+ messages in thread
From: Gao Xiang @ 2023-05-30 3:55 UTC (permalink / raw)
To: Jingbo Xu, xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
On 2023/5/18 10:45, Jingbo Xu wrote:
> Unify xattr_iter/listxattr_iter/getxattr_iter structures into
> erofs_xattr_iter structure.
>
> This is in preparation for the following further cleanup.
>
> Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
> ---
> fs/erofs/xattr.c | 172 ++++++++++++++++++++---------------------------
> 1 file changed, 72 insertions(+), 100 deletions(-)
>
> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
> index b79be2a556ba..1e44aa108134 100644
> --- a/fs/erofs/xattr.c
> +++ b/fs/erofs/xattr.c
> @@ -20,16 +20,22 @@ static inline unsigned int erofs_xattr_blkoff(struct super_block *sb,
> return erofs_blkoff(sb, xattr_id * sizeof(__u32));
> }
>
> -struct xattr_iter {
> +struct erofs_xattr_iter {
> struct super_block *sb;
> struct erofs_buf buf;
> void *kaddr;
> -
> erofs_blk_t blkaddr;
> unsigned int ofs;
> +
> + char *buffer;
> + int buffer_size, buffer_ofs;
> +
> + int index, infix_len;
> + struct qstr name;
> + struct dentry *dentry;
> };
>
> -static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
> +static inline int erofs_xattr_iter_fixup(struct erofs_xattr_iter *it)
> {
> if (it->ofs < it->sb->s_blocksize)
> return 0;
> @@ -42,7 +48,7 @@ static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
> return 0;
> }
>
> -static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
> +static inline int erofs_xattr_iter_fixup_aligned(struct erofs_xattr_iter *it)
> {
> if (it->ofs > it->sb->s_blocksize) {
> DBG_BUGON(1);
> @@ -54,7 +60,7 @@ static inline int erofs_xattr_iter_fixup_aligned(struct xattr_iter *it)
> static int erofs_init_inode_xattrs(struct inode *inode)
> {
> struct erofs_inode *const vi = EROFS_I(inode);
> - struct xattr_iter it;
> + struct erofs_xattr_iter it;
> unsigned int i;
> struct erofs_xattr_ibody_header *ih;
> struct super_block *sb = inode->i_sb;
> @@ -157,15 +163,15 @@ static int erofs_init_inode_xattrs(struct inode *inode)
> * and need to be handled
> */
> struct xattr_iter_handlers {
> - int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry);
> - int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf,
> + int (*entry)(struct erofs_xattr_iter *it, struct erofs_xattr_entry *entry);
> + int (*name)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
> unsigned int len);
> - int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz);
> - void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf,
> + int (*alloc_buffer)(struct erofs_xattr_iter *it, unsigned int value_sz);
> + void (*value)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
> unsigned int len);
> };
>
> -static int inline_xattr_iter_begin(struct xattr_iter *it,
> +static int inline_xattr_iter_begin(struct erofs_xattr_iter *it,
> struct inode *inode)
> {
> struct erofs_inode *const vi = EROFS_I(inode);
> @@ -193,7 +199,7 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
> * Regardless of success or failure, `xattr_foreach' will end up with
> * `ofs' pointing to the next xattr item rather than an arbitrary position.
> */
> -static int xattr_foreach(struct xattr_iter *it,
> +static int xattr_foreach(struct erofs_xattr_iter *it,
> const struct xattr_iter_handlers *op,
> unsigned int *tlimit)
> {
> @@ -284,18 +290,10 @@ static int xattr_foreach(struct xattr_iter *it,
> return err < 0 ? err : 0;
> }
>
> -struct getxattr_iter {
> - struct xattr_iter it;
> -
> - char *buffer;
> - int buffer_size, index, infix_len;
> - struct qstr name;
> -};
> -
> -static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
> +static int erofs_xattr_long_entrymatch(struct erofs_xattr_iter *it,
> struct erofs_xattr_entry *entry)
> {
> - struct erofs_sb_info *sbi = EROFS_SB(it->it.sb);
> + struct erofs_sb_info *sbi = EROFS_SB(it->sb);
> struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
> (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
>
> @@ -313,11 +311,9 @@ static int erofs_xattr_long_entrymatch(struct getxattr_iter *it,
> return 0;
> }
>
> -static int xattr_entrymatch(struct xattr_iter *_it,
> +static int xattr_entrymatch(struct erofs_xattr_iter *it,
> struct erofs_xattr_entry *entry)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> -
> /* should also match the infix for long name prefixes */
> if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX)
> return erofs_xattr_long_entrymatch(it, entry);
> @@ -329,32 +325,27 @@ static int xattr_entrymatch(struct xattr_iter *_it,
> return 0;
> }
>
> -static int xattr_namematch(struct xattr_iter *_it,
> +static int xattr_namematch(struct erofs_xattr_iter *it,
> unsigned int processed, char *buf, unsigned int len)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> -
> if (memcmp(buf, it->name.name + it->infix_len + processed, len))
> return -ENOATTR;
> return 0;
> }
>
> -static int xattr_checkbuffer(struct xattr_iter *_it,
> +static int xattr_checkbuffer(struct erofs_xattr_iter *it,
> unsigned int value_sz)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> int err = it->buffer_size < value_sz ? -ERANGE : 0;
>
> it->buffer_size = value_sz;
> return !it->buffer ? 1 : err;
> }
>
> -static void xattr_copyvalue(struct xattr_iter *_it,
> +static void xattr_copyvalue(struct erofs_xattr_iter *it,
> unsigned int processed,
> char *buf, unsigned int len)
> {
> - struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it);
> -
> memcpy(it->buffer + processed, buf, len);
> }
>
> @@ -365,41 +356,40 @@ static const struct xattr_iter_handlers find_xattr_handlers = {
> .value = xattr_copyvalue
> };
>
> -static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
> +static int inline_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
> {
> int ret;
> unsigned int remaining;
>
> - ret = inline_xattr_iter_begin(&it->it, inode);
> + ret = inline_xattr_iter_begin(it, inode);
> if (ret < 0)
> return ret;
>
> remaining = ret;
> while (remaining) {
> - ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining);
> + ret = xattr_foreach(it, &find_xattr_handlers, &remaining);
> if (ret != -ENOATTR)
> break;
> }
> return ret ? ret : it->buffer_size;
> }
>
> -static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
> +static int shared_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
> {
> struct erofs_inode *const vi = EROFS_I(inode);
> - struct super_block *const sb = it->it.sb;
> + struct super_block *const sb = it->sb;
> unsigned int i, xsid;
> int ret = -ENOATTR;
>
> for (i = 0; i < vi->xattr_shared_count; ++i) {
> xsid = vi->xattr_shared_xattrs[i];
> - it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
> - it->it.ofs = erofs_xattr_blkoff(sb, xsid);
> - it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
> - it->it.blkaddr, EROFS_KMAP);
> - if (IS_ERR(it->it.kaddr))
> - return PTR_ERR(it->it.kaddr);
> -
> - ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL);
> + it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
> + it->ofs = erofs_xattr_blkoff(sb, xsid);
> + it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> +
> + ret = xattr_foreach(it, &find_xattr_handlers, NULL);
> if (ret != -ENOATTR)
> break;
> }
> @@ -421,31 +411,30 @@ int erofs_getxattr(struct inode *inode, int index,
> void *buffer, size_t buffer_size)
> {
> int ret;
> - struct getxattr_iter it;
> + struct erofs_xattr_iter it;
>
> if (!name)
> return -EINVAL;
> + if (strlen(name) > EROFS_NAME_LEN)
> + return -ERANGE;
duplicated calculation.
>
> ret = erofs_init_inode_xattrs(inode);
> if (ret)
> return ret;
>
> - it.index = index;
> - it.name.len = strlen(name);
> - if (it.name.len > EROFS_NAME_LEN)
> - return -ERANGE;
> -
> - it.it.buf = __EROFS_BUF_INITIALIZER;
> - it.name.name = name;
> -
> - it.buffer = buffer;
> - it.buffer_size = buffer_size;
> + it = (struct erofs_xattr_iter) {
> + .buf = __EROFS_BUF_INITIALIZER,
> + .sb = inode->i_sb,
> + .name = QSTR_INIT(name, strlen(name)),
> + .index = index,
> + .buffer = buffer,
> + .buffer_size = buffer_size,
> + };
No need to zero out the other fields like this?
>
> - it.it.sb = inode->i_sb;
> ret = inline_getxattr(inode, &it);
> if (ret == -ENOATTR)
> ret = shared_getxattr(inode, &it);
> - erofs_put_metabuf(&it.it.buf);
> + erofs_put_metabuf(&it.buf);
> return ret;
> }
>
> @@ -491,25 +480,15 @@ const struct xattr_handler *erofs_xattr_handlers[] = {
> NULL,
> };
>
> -struct listxattr_iter {
> - struct xattr_iter it;
> -
> - struct dentry *dentry;
> - char *buffer;
> - int buffer_size, buffer_ofs;
> -};
> -
> -static int xattr_entrylist(struct xattr_iter *_it,
> +static int xattr_entrylist(struct erofs_xattr_iter *it,
> struct erofs_xattr_entry *entry)
> {
> - struct listxattr_iter *it =
> - container_of(_it, struct listxattr_iter, it);
> unsigned int base_index = entry->e_name_index;
> unsigned int prefix_len, infix_len = 0;
> const char *prefix, *infix = NULL;
>
> if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
> - struct erofs_sb_info *sbi = EROFS_SB(_it->sb);
> + struct erofs_sb_info *sbi = EROFS_SB(it->sb);
> struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
> (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
>
> @@ -541,23 +520,17 @@ static int xattr_entrylist(struct xattr_iter *_it,
> return 0;
> }
>
> -static int xattr_namelist(struct xattr_iter *_it,
> +static int xattr_namelist(struct erofs_xattr_iter *it,
> unsigned int processed, char *buf, unsigned int len)
> {
> - struct listxattr_iter *it =
> - container_of(_it, struct listxattr_iter, it);
> -
> memcpy(it->buffer + it->buffer_ofs, buf, len);
> it->buffer_ofs += len;
> return 0;
> }
>
> -static int xattr_skipvalue(struct xattr_iter *_it,
> +static int xattr_skipvalue(struct erofs_xattr_iter *it,
> unsigned int value_sz)
> {
> - struct listxattr_iter *it =
> - container_of(_it, struct listxattr_iter, it);
> -
> it->buffer[it->buffer_ofs++] = '\0';
> return 1;
> }
> @@ -569,42 +542,41 @@ static const struct xattr_iter_handlers list_xattr_handlers = {
> .value = NULL
> };
>
> -static int inline_listxattr(struct listxattr_iter *it)
> +static int inline_listxattr(struct erofs_xattr_iter *it)
> {
> int ret;
> unsigned int remaining;
>
> - ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry));
> + ret = inline_xattr_iter_begin(it, d_inode(it->dentry));
> if (ret < 0)
> return ret;
>
> remaining = ret;
> while (remaining) {
> - ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining);
> + ret = xattr_foreach(it, &list_xattr_handlers, &remaining);
> if (ret)
> break;
> }
> return ret ? ret : it->buffer_ofs;
> }
>
> -static int shared_listxattr(struct listxattr_iter *it)
> +static int shared_listxattr(struct erofs_xattr_iter *it)
> {
> struct inode *const inode = d_inode(it->dentry);
> struct erofs_inode *const vi = EROFS_I(inode);
> - struct super_block *const sb = it->it.sb;
> + struct super_block *const sb = it->sb;
> unsigned int i, xsid;
> int ret = 0;
>
> for (i = 0; i < vi->xattr_shared_count; ++i) {
> xsid = vi->xattr_shared_xattrs[i];
> - it->it.blkaddr = erofs_xattr_blkaddr(sb, xsid);
> - it->it.ofs = erofs_xattr_blkoff(sb, xsid);
> - it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb,
> - it->it.blkaddr, EROFS_KMAP);
> - if (IS_ERR(it->it.kaddr))
> - return PTR_ERR(it->it.kaddr);
> -
> - ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL);
> + it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
> + it->ofs = erofs_xattr_blkoff(sb, xsid);
> + it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
> + if (IS_ERR(it->kaddr))
> + return PTR_ERR(it->kaddr);
> +
> + ret = xattr_foreach(it, &list_xattr_handlers, NULL);
> if (ret)
> break;
> }
> @@ -615,7 +587,7 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> char *buffer, size_t buffer_size)
> {
> int ret;
> - struct listxattr_iter it;
> + struct erofs_xattr_iter it;
>
> ret = erofs_init_inode_xattrs(d_inode(dentry));
> if (ret == -ENOATTR)
> @@ -623,18 +595,18 @@ ssize_t erofs_listxattr(struct dentry *dentry,
> if (ret)
> return ret;
>
> - it.it.buf = __EROFS_BUF_INITIALIZER;
> - it.dentry = dentry;
> - it.buffer = buffer;
> - it.buffer_size = buffer_size;
> - it.buffer_ofs = 0;
> -
> - it.it.sb = dentry->d_sb;
> + it = (struct erofs_xattr_iter) {
> + .buf = __EROFS_BUF_INITIALIZER,
> + .sb = dentry->d_sb,
> + .dentry = dentry,
> + .buffer = buffer,
> + .buffer_size = buffer_size,
> + };
Same here.
Thanks,
Gao Xiang
>
> ret = inline_listxattr(&it);
> if (ret >= 0 || ret == -ENOATTR)
> ret = shared_listxattr(&it);
> - erofs_put_metabuf(&it.it.buf);
> + erofs_put_metabuf(&it.buf);
> return ret;
> }
>
^ permalink raw reply [flat|nested] 10+ messages in thread
* [PATCH v3 3/5] erofs: make the size of read data stored in buffer_ofs
2023-05-18 2:45 [PATCH v3 0/5] erofs: cleanup of xattr handling Jingbo Xu
2023-05-18 2:45 ` [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned() helper Jingbo Xu
2023-05-18 2:45 ` [PATCH v3 2/5] erofs: unify xattr_iter structures Jingbo Xu
@ 2023-05-18 2:45 ` Jingbo Xu
2023-05-18 2:45 ` [PATCH v3 4/5] erofs: unify inline/share xattr iterators for listxattr/getxattr Jingbo Xu
2023-05-18 2:45 ` [PATCH v3 5/5] erofs: use separate xattr parsers " Jingbo Xu
4 siblings, 0 replies; 10+ messages in thread
From: Jingbo Xu @ 2023-05-18 2:45 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
Since now xattr_iter structures have been unified, make the size of the
read data stored in buffer_ofs. Don't bother reusing buffer_size for
this use, which may be confusing.
This is in preparation for the following further cleanup.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 1e44aa108134..87d76ccea692 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -338,7 +338,7 @@ static int xattr_checkbuffer(struct erofs_xattr_iter *it,
{
int err = it->buffer_size < value_sz ? -ERANGE : 0;
- it->buffer_size = value_sz;
+ it->buffer_ofs = value_sz;
return !it->buffer ? 1 : err;
}
@@ -371,7 +371,7 @@ static int inline_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
if (ret != -ENOATTR)
break;
}
- return ret ? ret : it->buffer_size;
+ return ret ? ret : it->buffer_ofs;
}
static int shared_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
@@ -393,7 +393,7 @@ static int shared_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
if (ret != -ENOATTR)
break;
}
- return ret ? ret : it->buffer_size;
+ return ret ? ret : it->buffer_ofs;
}
static bool erofs_xattr_user_list(struct dentry *dentry)
--
2.19.1.6.gb485710b
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v3 4/5] erofs: unify inline/share xattr iterators for listxattr/getxattr
2023-05-18 2:45 [PATCH v3 0/5] erofs: cleanup of xattr handling Jingbo Xu
` (2 preceding siblings ...)
2023-05-18 2:45 ` [PATCH v3 3/5] erofs: make the size of read data stored in buffer_ofs Jingbo Xu
@ 2023-05-18 2:45 ` Jingbo Xu
2023-05-18 2:45 ` [PATCH v3 5/5] erofs: use separate xattr parsers " Jingbo Xu
4 siblings, 0 replies; 10+ messages in thread
From: Jingbo Xu @ 2023-05-18 2:45 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
Make inline_getxattr() and inline_listxattr() unified as
iter_inline_xattr(), shared_getxattr() and shared_listxattr() unified as
iter_shared_xattr().
After the unification, both iter_inline_xattr() and iter_shared_xattr()
return 0 on success, and negative error on failure.
One thing worth noting is that, the logic of returning it->buffer_ofs
when there's no shared xattrs in shared_listxattr() is moved to
erofs_listxattr() to make the unification possible. The only difference
is that, semantically the old behavior will return ENOATTR rather than
it->buffer_ofs if ENOATTR encountered when listxattr is parsing upon a
specific shared xattr, while now the new behavior will return
it->buffer_ofs in this case. This is not an issue, as listxattr upon a
specific xattr won't return ENOATTR.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 211 ++++++++++++++++++-----------------------------
1 file changed, 80 insertions(+), 131 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 87d76ccea692..435146628eed 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -7,19 +7,6 @@
#include <linux/security.h>
#include "xattr.h"
-static inline erofs_blk_t erofs_xattr_blkaddr(struct super_block *sb,
- unsigned int xattr_id)
-{
- return EROFS_SB(sb)->xattr_blkaddr +
- erofs_blknr(sb, xattr_id * sizeof(__u32));
-}
-
-static inline unsigned int erofs_xattr_blkoff(struct super_block *sb,
- unsigned int xattr_id)
-{
- return erofs_blkoff(sb, xattr_id * sizeof(__u32));
-}
-
struct erofs_xattr_iter {
struct super_block *sb;
struct erofs_buf buf;
@@ -33,6 +20,8 @@ struct erofs_xattr_iter {
int index, infix_len;
struct qstr name;
struct dentry *dentry;
+ struct inode *inode;
+ bool getxattr;
};
static inline int erofs_xattr_iter_fixup(struct erofs_xattr_iter *it)
@@ -171,30 +160,6 @@ struct xattr_iter_handlers {
unsigned int len);
};
-static int inline_xattr_iter_begin(struct erofs_xattr_iter *it,
- struct inode *inode)
-{
- struct erofs_inode *const vi = EROFS_I(inode);
- unsigned int xattr_header_sz, inline_xattr_ofs;
-
- xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
- sizeof(u32) * vi->xattr_shared_count;
- if (xattr_header_sz >= vi->xattr_isize) {
- DBG_BUGON(xattr_header_sz > vi->xattr_isize);
- return -ENOATTR;
- }
-
- inline_xattr_ofs = vi->inode_isize + xattr_header_sz;
-
- it->blkaddr = erofs_blknr(it->sb, erofs_iloc(inode) + inline_xattr_ofs);
- it->ofs = erofs_blkoff(it->sb, erofs_iloc(inode) + inline_xattr_ofs);
- it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr,
- EROFS_KMAP);
- if (IS_ERR(it->kaddr))
- return PTR_ERR(it->kaddr);
- return vi->xattr_isize - xattr_header_sz;
-}
-
/*
* Regardless of success or failure, `xattr_foreach' will end up with
* `ofs' pointing to the next xattr item rather than an arbitrary position.
@@ -356,46 +321,6 @@ static const struct xattr_iter_handlers find_xattr_handlers = {
.value = xattr_copyvalue
};
-static int inline_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
-{
- int ret;
- unsigned int remaining;
-
- ret = inline_xattr_iter_begin(it, inode);
- if (ret < 0)
- return ret;
-
- remaining = ret;
- while (remaining) {
- ret = xattr_foreach(it, &find_xattr_handlers, &remaining);
- if (ret != -ENOATTR)
- break;
- }
- return ret ? ret : it->buffer_ofs;
-}
-
-static int shared_getxattr(struct inode *inode, struct erofs_xattr_iter *it)
-{
- struct erofs_inode *const vi = EROFS_I(inode);
- struct super_block *const sb = it->sb;
- unsigned int i, xsid;
- int ret = -ENOATTR;
-
- for (i = 0; i < vi->xattr_shared_count; ++i) {
- xsid = vi->xattr_shared_xattrs[i];
- it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
- it->ofs = erofs_xattr_blkoff(sb, xsid);
- it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
- if (IS_ERR(it->kaddr))
- return PTR_ERR(it->kaddr);
-
- ret = xattr_foreach(it, &find_xattr_handlers, NULL);
- if (ret != -ENOATTR)
- break;
- }
- return ret ? ret : it->buffer_ofs;
-}
-
static bool erofs_xattr_user_list(struct dentry *dentry)
{
return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER);
@@ -406,38 +331,6 @@ static bool erofs_xattr_trusted_list(struct dentry *dentry)
return capable(CAP_SYS_ADMIN);
}
-int erofs_getxattr(struct inode *inode, int index,
- const char *name,
- void *buffer, size_t buffer_size)
-{
- int ret;
- struct erofs_xattr_iter it;
-
- if (!name)
- return -EINVAL;
- if (strlen(name) > EROFS_NAME_LEN)
- return -ERANGE;
-
- ret = erofs_init_inode_xattrs(inode);
- if (ret)
- return ret;
-
- it = (struct erofs_xattr_iter) {
- .buf = __EROFS_BUF_INITIALIZER,
- .sb = inode->i_sb,
- .name = QSTR_INIT(name, strlen(name)),
- .index = index,
- .buffer = buffer,
- .buffer_size = buffer_size,
- };
-
- ret = inline_getxattr(inode, &it);
- if (ret == -ENOATTR)
- ret = shared_getxattr(inode, &it);
- erofs_put_metabuf(&it.buf);
- return ret;
-}
-
static int erofs_xattr_generic_get(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, void *buffer, size_t size)
@@ -542,45 +435,97 @@ static const struct xattr_iter_handlers list_xattr_handlers = {
.value = NULL
};
-static int inline_listxattr(struct erofs_xattr_iter *it)
+static int erofs_iter_inline_xattr(struct erofs_xattr_iter *it)
{
+ struct erofs_inode *const vi = EROFS_I(it->inode);
+ const struct xattr_iter_handlers *op;
+ unsigned int xattr_header_sz, remaining;
+ erofs_off_t pos;
int ret;
- unsigned int remaining;
- ret = inline_xattr_iter_begin(it, d_inode(it->dentry));
- if (ret < 0)
- return ret;
+ xattr_header_sz = sizeof(struct erofs_xattr_ibody_header) +
+ sizeof(u32) * vi->xattr_shared_count;
+ if (xattr_header_sz >= vi->xattr_isize) {
+ DBG_BUGON(xattr_header_sz > vi->xattr_isize);
+ return -ENOATTR;
+ }
+
+ pos = erofs_iloc(it->inode) + vi->inode_isize + xattr_header_sz;
+ it->blkaddr = erofs_blknr(it->sb, pos);
+ it->ofs = erofs_blkoff(it->sb, pos);
+ it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, EROFS_KMAP);
+ if (IS_ERR(it->kaddr))
+ return PTR_ERR(it->kaddr);
+
+ remaining = vi->xattr_isize - xattr_header_sz;
+ op = it->getxattr ? &find_xattr_handlers : &list_xattr_handlers;
- remaining = ret;
while (remaining) {
- ret = xattr_foreach(it, &list_xattr_handlers, &remaining);
- if (ret)
+ ret = xattr_foreach(it, op, &remaining);
+ if ((it->getxattr && ret != -ENOATTR) || (!it->getxattr && ret))
break;
}
- return ret ? ret : it->buffer_ofs;
+ return ret;
}
-static int shared_listxattr(struct erofs_xattr_iter *it)
+static int erofs_iter_shared_xattr(struct erofs_xattr_iter *it)
{
- struct inode *const inode = d_inode(it->dentry);
- struct erofs_inode *const vi = EROFS_I(inode);
+ struct erofs_inode *const vi = EROFS_I(it->inode);
struct super_block *const sb = it->sb;
+ const struct xattr_iter_handlers *op;
unsigned int i, xsid;
- int ret = 0;
+ int ret = -ENOATTR;
+
+ op = it->getxattr ? &find_xattr_handlers : &list_xattr_handlers;
for (i = 0; i < vi->xattr_shared_count; ++i) {
xsid = vi->xattr_shared_xattrs[i];
- it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
- it->ofs = erofs_xattr_blkoff(sb, xsid);
+ it->blkaddr = EROFS_SB(sb)->xattr_blkaddr +
+ erofs_blknr(sb, xsid * sizeof(__u32));
+ it->ofs = erofs_blkoff(sb, xsid * sizeof(__u32));
it->kaddr = erofs_read_metabuf(&it->buf, sb, it->blkaddr, EROFS_KMAP);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
- ret = xattr_foreach(it, &list_xattr_handlers, NULL);
- if (ret)
+ ret = xattr_foreach(it, op, NULL);
+ if ((it->getxattr && ret != -ENOATTR) || (!it->getxattr && ret))
break;
}
- return ret ? ret : it->buffer_ofs;
+ return ret;
+}
+
+int erofs_getxattr(struct inode *inode, int index,
+ const char *name,
+ void *buffer, size_t buffer_size)
+{
+ int ret;
+ struct erofs_xattr_iter it;
+
+ if (!name)
+ return -EINVAL;
+ if (strlen(name) > EROFS_NAME_LEN)
+ return -ERANGE;
+
+ ret = erofs_init_inode_xattrs(inode);
+ if (ret)
+ return ret;
+
+ it = (struct erofs_xattr_iter) {
+ .buf = __EROFS_BUF_INITIALIZER,
+ .sb = inode->i_sb,
+ .inode = inode,
+ .name = QSTR_INIT(name, strlen(name)),
+ .index = index,
+ .buffer = buffer,
+ .buffer_size = buffer_size,
+ .getxattr = true,
+ };
+
+ ret = erofs_iter_inline_xattr(&it);
+ if (ret == -ENOATTR)
+ ret = erofs_iter_shared_xattr(&it);
+ erofs_put_metabuf(&it.buf);
+ return ret ? ret : it.buffer_ofs;
}
ssize_t erofs_listxattr(struct dentry *dentry,
@@ -599,15 +544,19 @@ ssize_t erofs_listxattr(struct dentry *dentry,
.buf = __EROFS_BUF_INITIALIZER,
.sb = dentry->d_sb,
.dentry = dentry,
+ .inode = d_inode(dentry),
.buffer = buffer,
.buffer_size = buffer_size,
+ .getxattr = false,
};
- ret = inline_listxattr(&it);
- if (ret >= 0 || ret == -ENOATTR)
- ret = shared_listxattr(&it);
+ ret = erofs_iter_inline_xattr(&it);
+ if (!ret || ret == -ENOATTR)
+ ret = erofs_iter_shared_xattr(&it);
+ if (ret == -ENOATTR)
+ ret = 0;
erofs_put_metabuf(&it.buf);
- return ret;
+ return ret ? ret : it.buffer_ofs;
}
void erofs_xattr_prefixes_cleanup(struct super_block *sb)
--
2.19.1.6.gb485710b
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v3 5/5] erofs: use separate xattr parsers for listxattr/getxattr
2023-05-18 2:45 [PATCH v3 0/5] erofs: cleanup of xattr handling Jingbo Xu
` (3 preceding siblings ...)
2023-05-18 2:45 ` [PATCH v3 4/5] erofs: unify inline/share xattr iterators for listxattr/getxattr Jingbo Xu
@ 2023-05-18 2:45 ` Jingbo Xu
4 siblings, 0 replies; 10+ messages in thread
From: Jingbo Xu @ 2023-05-18 2:45 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
There's a callback styled xattr parser, i.e. xattr_foreach(), which is
shared among listxattr and getxattr. Convert it to two separate xattr
parsers for listxattr and getxattr.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 389 +++++++++++++++++++++--------------------------
1 file changed, 170 insertions(+), 219 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 435146628eed..111735fb6fbc 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -12,7 +12,7 @@ struct erofs_xattr_iter {
struct erofs_buf buf;
void *kaddr;
erofs_blk_t blkaddr;
- unsigned int ofs;
+ unsigned int ofs, t_ofs;
char *buffer;
int buffer_size, buffer_ofs;
@@ -21,6 +21,7 @@ struct erofs_xattr_iter {
struct qstr name;
struct dentry *dentry;
struct inode *inode;
+ unsigned int remaining; /* size of inline xattrs to be iterated */
bool getxattr;
};
@@ -46,6 +47,28 @@ static inline int erofs_xattr_iter_fixup_aligned(struct erofs_xattr_iter *it)
return erofs_xattr_iter_fixup(it);
}
+static int erofs_xattr_iter_prep(struct erofs_xattr_iter *it)
+{
+ unsigned int entry_sz;
+ int err;
+
+ err = erofs_xattr_iter_fixup(it);
+ if (err)
+ return err;
+
+ entry_sz = erofs_xattr_entry_size(it->kaddr + it->ofs);
+ it->t_ofs = it->ofs + entry_sz;
+ if (it->remaining) {
+ /* xattr on-disk corruption: xattr entry beyond xattr_isize */
+ if (it->remaining < entry_sz) {
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
+ }
+ it->remaining -= entry_sz;
+ }
+ return 0;
+}
+
static int erofs_init_inode_xattrs(struct inode *inode)
{
struct erofs_inode *const vi = EROFS_I(inode);
@@ -144,183 +167,6 @@ static int erofs_init_inode_xattrs(struct inode *inode)
return ret;
}
-/*
- * the general idea for these return values is
- * if 0 is returned, go on processing the current xattr;
- * 1 (> 0) is returned, skip this round to process the next xattr;
- * -err (< 0) is returned, an error (maybe ENOXATTR) occurred
- * and need to be handled
- */
-struct xattr_iter_handlers {
- int (*entry)(struct erofs_xattr_iter *it, struct erofs_xattr_entry *entry);
- int (*name)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
- unsigned int len);
- int (*alloc_buffer)(struct erofs_xattr_iter *it, unsigned int value_sz);
- void (*value)(struct erofs_xattr_iter *it, unsigned int processed, char *buf,
- unsigned int len);
-};
-
-/*
- * Regardless of success or failure, `xattr_foreach' will end up with
- * `ofs' pointing to the next xattr item rather than an arbitrary position.
- */
-static int xattr_foreach(struct erofs_xattr_iter *it,
- const struct xattr_iter_handlers *op,
- unsigned int *tlimit)
-{
- struct erofs_xattr_entry entry;
- unsigned int value_sz, processed, slice;
- int err;
-
- /* 0. fixup blkaddr, ofs, ipage */
- err = erofs_xattr_iter_fixup(it);
- if (err)
- return err;
-
- /*
- * 1. read xattr entry to the memory,
- * since we do EROFS_XATTR_ALIGN
- * therefore entry should be in the page
- */
- entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs);
- if (tlimit) {
- unsigned int entry_sz = erofs_xattr_entry_size(&entry);
-
- /* xattr on-disk corruption: xattr entry beyond xattr_isize */
- if (*tlimit < entry_sz) {
- DBG_BUGON(1);
- return -EFSCORRUPTED;
- }
- *tlimit -= entry_sz;
- }
-
- it->ofs += sizeof(struct erofs_xattr_entry);
- value_sz = le16_to_cpu(entry.e_value_size);
-
- /* handle entry */
- err = op->entry(it, &entry);
- if (err) {
- it->ofs += entry.e_name_len + value_sz;
- goto out;
- }
-
- /* 2. handle xattr name (ofs will finally be at the end of name) */
- processed = 0;
-
- while (processed < entry.e_name_len) {
- err = erofs_xattr_iter_fixup_aligned(it);
- if (err)
- goto out;
-
- slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
- entry.e_name_len - processed);
-
- /* handle name */
- err = op->name(it, processed, it->kaddr + it->ofs, slice);
- if (err) {
- it->ofs += entry.e_name_len - processed + value_sz;
- goto out;
- }
-
- it->ofs += slice;
- processed += slice;
- }
-
- /* 3. handle xattr value */
- processed = 0;
-
- if (op->alloc_buffer) {
- err = op->alloc_buffer(it, value_sz);
- if (err) {
- it->ofs += value_sz;
- goto out;
- }
- }
-
- while (processed < value_sz) {
- err = erofs_xattr_iter_fixup_aligned(it);
- if (err)
- goto out;
-
- slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
- value_sz - processed);
- op->value(it, processed, it->kaddr + it->ofs, slice);
- it->ofs += slice;
- processed += slice;
- }
-
-out:
- /* xattrs should be 4-byte aligned (on-disk constraint) */
- it->ofs = EROFS_XATTR_ALIGN(it->ofs);
- return err < 0 ? err : 0;
-}
-
-static int erofs_xattr_long_entrymatch(struct erofs_xattr_iter *it,
- struct erofs_xattr_entry *entry)
-{
- struct erofs_sb_info *sbi = EROFS_SB(it->sb);
- struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
- (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
-
- if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
- return -ENOATTR;
-
- if (it->index != pf->prefix->base_index ||
- it->name.len != entry->e_name_len + pf->infix_len)
- return -ENOATTR;
-
- if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))
- return -ENOATTR;
-
- it->infix_len = pf->infix_len;
- return 0;
-}
-
-static int xattr_entrymatch(struct erofs_xattr_iter *it,
- struct erofs_xattr_entry *entry)
-{
- /* should also match the infix for long name prefixes */
- if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX)
- return erofs_xattr_long_entrymatch(it, entry);
-
- if (it->index != entry->e_name_index ||
- it->name.len != entry->e_name_len)
- return -ENOATTR;
- it->infix_len = 0;
- return 0;
-}
-
-static int xattr_namematch(struct erofs_xattr_iter *it,
- unsigned int processed, char *buf, unsigned int len)
-{
- if (memcmp(buf, it->name.name + it->infix_len + processed, len))
- return -ENOATTR;
- return 0;
-}
-
-static int xattr_checkbuffer(struct erofs_xattr_iter *it,
- unsigned int value_sz)
-{
- int err = it->buffer_size < value_sz ? -ERANGE : 0;
-
- it->buffer_ofs = value_sz;
- return !it->buffer ? 1 : err;
-}
-
-static void xattr_copyvalue(struct erofs_xattr_iter *it,
- unsigned int processed,
- char *buf, unsigned int len)
-{
- memcpy(it->buffer + processed, buf, len);
-}
-
-static const struct xattr_iter_handlers find_xattr_handlers = {
- .entry = xattr_entrymatch,
- .name = xattr_namematch,
- .alloc_buffer = xattr_checkbuffer,
- .value = xattr_copyvalue
-};
-
static bool erofs_xattr_user_list(struct dentry *dentry)
{
return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER);
@@ -373,20 +219,74 @@ const struct xattr_handler *erofs_xattr_handlers[] = {
NULL,
};
-static int xattr_entrylist(struct erofs_xattr_iter *it,
- struct erofs_xattr_entry *entry)
+typedef int (*erofs_xattr_body_handler)(struct erofs_xattr_iter *it,
+ unsigned int processed, char *buf, unsigned int len);
+
+static int erofs_xattr_namematch(struct erofs_xattr_iter *it,
+ unsigned int processed, char *buf, unsigned int len)
+{
+ if (memcmp(buf, it->name.name + it->infix_len + processed, len))
+ return -ENOATTR;
+ return 0;
+}
+
+static int erofs_xattr_copy(struct erofs_xattr_iter *it,
+ unsigned int unused, char *buf, unsigned int len)
+{
+ memcpy(it->buffer + it->buffer_ofs, buf, len);
+ it->buffer_ofs += len;
+ return 0;
+}
+
+static int erofs_xattr_body(struct erofs_xattr_iter *it, unsigned int len,
+ erofs_xattr_body_handler handler)
+{
+ unsigned int slice, processed = 0;
+
+ while (processed < len) {
+ int err = erofs_xattr_iter_fixup_aligned(it);
+ if (err)
+ return err;
+
+ slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
+ len - processed);
+ err = handler(it, processed, it->kaddr + it->ofs, slice);
+ if (err)
+ return err;
+
+ it->ofs += slice;
+ processed += slice;
+ }
+ return 0;
+}
+
+/*
+ * Wen returning 0 or ENOATTR, erofs_[list|get]xattr_foreach() will end up
+ * with `ofs' pointing to the next xattr item rather than an arbitrary position.
+ */
+static int erofs_listxattr_foreach(struct erofs_xattr_iter *it)
{
- unsigned int base_index = entry->e_name_index;
- unsigned int prefix_len, infix_len = 0;
+ struct erofs_xattr_entry entry;
+ unsigned int base_index, prefix_len, infix_len = 0;
const char *prefix, *infix = NULL;
+ int err;
+
+ err = erofs_xattr_iter_prep(it);
+ if (err)
+ return err;
+
+ /* 1. handle xattr entry */
+ entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs);
+ it->ofs += sizeof(struct erofs_xattr_entry);
+ base_index = entry.e_name_index;
- if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
+ if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) {
struct erofs_sb_info *sbi = EROFS_SB(it->sb);
struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
- (entry->e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
+ (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
- return 1;
+ goto out;
infix = pf->prefix->infix;
infix_len = pf->infix_len;
base_index = pf->prefix->base_index;
@@ -394,52 +294,102 @@ static int xattr_entrylist(struct erofs_xattr_iter *it,
prefix = erofs_xattr_prefix(base_index, it->dentry);
if (!prefix)
- return 1;
+ goto out;
prefix_len = strlen(prefix);
if (!it->buffer) {
- it->buffer_ofs += prefix_len + infix_len +
- entry->e_name_len + 1;
- return 1;
+ it->buffer_ofs += prefix_len + infix_len + entry.e_name_len + 1;
+ goto out;
}
if (it->buffer_ofs + prefix_len + infix_len +
- + entry->e_name_len + 1 > it->buffer_size)
+ entry.e_name_len + 1 > it->buffer_size)
return -ERANGE;
memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len);
memcpy(it->buffer + it->buffer_ofs + prefix_len, infix, infix_len);
it->buffer_ofs += prefix_len + infix_len;
- return 0;
-}
-static int xattr_namelist(struct erofs_xattr_iter *it,
- unsigned int processed, char *buf, unsigned int len)
-{
- memcpy(it->buffer + it->buffer_ofs, buf, len);
- it->buffer_ofs += len;
+ /* 2. handle xattr name (err can't be ENOATTR) */
+ err = erofs_xattr_body(it, entry.e_name_len, erofs_xattr_copy);
+ if (err)
+ return err;
+
+ it->buffer[it->buffer_ofs++] = '\0';
+ it->ofs += le16_to_cpu(entry.e_value_size);
+ it->ofs = EROFS_XATTR_ALIGN(it->ofs);
+ return 0;
+out:
+ it->ofs = it->t_ofs;
return 0;
}
-static int xattr_skipvalue(struct erofs_xattr_iter *it,
- unsigned int value_sz)
+static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
{
- it->buffer[it->buffer_ofs++] = '\0';
- return 1;
-}
+ struct erofs_xattr_entry entry;
+ unsigned int value_sz;
+ int err;
-static const struct xattr_iter_handlers list_xattr_handlers = {
- .entry = xattr_entrylist,
- .name = xattr_namelist,
- .alloc_buffer = xattr_skipvalue,
- .value = NULL
-};
+ err = erofs_xattr_iter_prep(it);
+ if (err)
+ return err;
+
+ /* 1. handle xattr entry */
+ entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs);
+ it->ofs += sizeof(struct erofs_xattr_entry);
+ value_sz = le16_to_cpu(entry.e_value_size);
+
+ err = -ENOATTR;
+ /* should also match the infix for long name prefixes */
+ if (entry.e_name_index & EROFS_XATTR_LONG_PREFIX) {
+ struct erofs_sb_info *sbi = EROFS_SB(it->sb);
+ struct erofs_xattr_prefix_item *pf = sbi->xattr_prefixes +
+ (entry.e_name_index & EROFS_XATTR_LONG_PREFIX_MASK);
+
+ if (pf >= sbi->xattr_prefixes + sbi->xattr_prefix_count)
+ goto out;
+
+ if (it->index != pf->prefix->base_index ||
+ it->name.len != entry.e_name_len + pf->infix_len)
+ goto out;
+
+ if (memcmp(it->name.name, pf->prefix->infix, pf->infix_len))
+ goto out;
+
+ it->infix_len = pf->infix_len;
+ } else {
+ if (it->index != entry.e_name_index ||
+ it->name.len != entry.e_name_len)
+ goto out;
+ it->infix_len = 0;
+ }
+
+ /* 2. handle xattr name */
+ err = erofs_xattr_body(it, entry.e_name_len, erofs_xattr_namematch);
+ if (err)
+ goto out;
+
+ /* 3. handle xattr value */
+ if (!it->buffer) {
+ it->buffer_ofs = value_sz;
+ goto out; /* err == 0 */
+ }
+ if (it->buffer_size < value_sz)
+ return -ERANGE;
+
+ /* no need normalizing ofs on error (err can't be ENOATTR) */
+ err = erofs_xattr_body(it, value_sz, erofs_xattr_copy);
+ it->ofs = EROFS_XATTR_ALIGN(it->ofs);
+ return err;
+out:
+ it->ofs = it->t_ofs;
+ return err;
+}
static int erofs_iter_inline_xattr(struct erofs_xattr_iter *it)
{
struct erofs_inode *const vi = EROFS_I(it->inode);
- const struct xattr_iter_handlers *op;
- unsigned int xattr_header_sz, remaining;
+ unsigned int xattr_header_sz;
erofs_off_t pos;
int ret;
@@ -457,11 +407,12 @@ static int erofs_iter_inline_xattr(struct erofs_xattr_iter *it)
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
- remaining = vi->xattr_isize - xattr_header_sz;
- op = it->getxattr ? &find_xattr_handlers : &list_xattr_handlers;
-
- while (remaining) {
- ret = xattr_foreach(it, op, &remaining);
+ it->remaining = vi->xattr_isize - xattr_header_sz;
+ while (it->remaining) {
+ if (it->getxattr)
+ ret = erofs_getxattr_foreach(it);
+ else
+ ret = erofs_listxattr_foreach(it);
if ((it->getxattr && ret != -ENOATTR) || (!it->getxattr && ret))
break;
}
@@ -472,12 +423,9 @@ static int erofs_iter_shared_xattr(struct erofs_xattr_iter *it)
{
struct erofs_inode *const vi = EROFS_I(it->inode);
struct super_block *const sb = it->sb;
- const struct xattr_iter_handlers *op;
unsigned int i, xsid;
int ret = -ENOATTR;
- op = it->getxattr ? &find_xattr_handlers : &list_xattr_handlers;
-
for (i = 0; i < vi->xattr_shared_count; ++i) {
xsid = vi->xattr_shared_xattrs[i];
it->blkaddr = EROFS_SB(sb)->xattr_blkaddr +
@@ -487,7 +435,10 @@ static int erofs_iter_shared_xattr(struct erofs_xattr_iter *it)
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
- ret = xattr_foreach(it, op, NULL);
+ if (it->getxattr)
+ ret = erofs_getxattr_foreach(it);
+ else
+ ret = erofs_listxattr_foreach(it);
if ((it->getxattr && ret != -ENOATTR) || (!it->getxattr && ret))
break;
}
--
2.19.1.6.gb485710b
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