* [PATCH v5 1/6] erofs: convert erofs_read_metabuf() to erofs_bread() for xattr
2023-06-01 2:43 [PATCH v5 0/6] erofs: cleanup of xattr handling Jingbo Xu
@ 2023-06-01 2:43 ` Jingbo Xu
2023-06-01 3:01 ` Gao Xiang
2023-06-01 2:43 ` [PATCH v5 2/6] erofs: enhance erofs_xattr_iter_fixup() helper Jingbo Xu
` (4 subsequent siblings)
5 siblings, 1 reply; 12+ messages in thread
From: Jingbo Xu @ 2023-06-01 2:43 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
buf->inode is constant once initialized during erofs_buf's lifetime.
Thus call erofs_init_metabuf() and erofs_bread() separately to avoid
the repetition of assigning buf->inode when iterating xattrs.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 25 +++++++++++--------------
1 file changed, 11 insertions(+), 14 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index bbfe7ce170d2..d9e041d27a35 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -81,11 +81,12 @@ static int erofs_init_inode_xattrs(struct inode *inode)
}
it.buf = __EROFS_BUF_INITIALIZER;
+ erofs_init_metabuf(&it.buf, sb);
it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize);
it.ofs = erofs_blkoff(sb, erofs_iloc(inode) + vi->inode_isize);
/* read in shared xattr array (non-atomic, see kmalloc below) */
- it.kaddr = erofs_read_metabuf(&it.buf, sb, it.blkaddr, EROFS_KMAP);
+ it.kaddr = erofs_bread(&it.buf, it.blkaddr, EROFS_KMAP);
if (IS_ERR(it.kaddr)) {
ret = PTR_ERR(it.kaddr);
goto out_unlock;
@@ -109,8 +110,7 @@ static int erofs_init_inode_xattrs(struct inode *inode)
/* cannot be unaligned */
DBG_BUGON(it.ofs != sb->s_blocksize);
- it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr,
- EROFS_KMAP);
+ it.kaddr = erofs_bread(&it.buf, ++it.blkaddr, EROFS_KMAP);
if (IS_ERR(it.kaddr)) {
kfree(vi->xattr_shared_xattrs);
vi->xattr_shared_xattrs = NULL;
@@ -156,8 +156,7 @@ static inline int xattr_iter_fixup(struct xattr_iter *it)
return 0;
it->blkaddr += erofs_blknr(it->sb, it->ofs);
- it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
- EROFS_KMAP);
+ it->kaddr = erofs_bread(&it->buf, it->blkaddr, EROFS_KMAP);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
it->ofs = erofs_blkoff(it->sb, it->ofs);
@@ -181,8 +180,7 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
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);
+ it->kaddr = erofs_bread(&it->buf, it->blkaddr, EROFS_KMAP);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
return vi->xattr_isize - xattr_header_sz;
@@ -403,8 +401,7 @@ static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
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);
+ it->it.kaddr = erofs_bread(&it->it.buf, it->it.blkaddr, EROFS_KMAP);
if (IS_ERR(it->it.kaddr))
return PTR_ERR(it->it.kaddr);
@@ -444,13 +441,14 @@ int erofs_getxattr(struct inode *inode, int index,
if (it.name.len > EROFS_NAME_LEN)
return -ERANGE;
+ it.it.sb = inode->i_sb;
it.it.buf = __EROFS_BUF_INITIALIZER;
+ erofs_init_metabuf(&it.it.buf, it.it.sb);
it.name.name = name;
it.buffer = buffer;
it.buffer_size = buffer_size;
- it.it.sb = inode->i_sb;
ret = inline_getxattr(inode, &it);
if (ret == -ENOATTR)
ret = shared_getxattr(inode, &it);
@@ -608,8 +606,7 @@ static int shared_listxattr(struct listxattr_iter *it)
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);
+ it->it.kaddr = erofs_bread(&it->it.buf, it->it.blkaddr, EROFS_KMAP);
if (IS_ERR(it->it.kaddr))
return PTR_ERR(it->it.kaddr);
@@ -632,14 +629,14 @@ ssize_t erofs_listxattr(struct dentry *dentry,
if (ret)
return ret;
+ it.it.sb = dentry->d_sb;
it.it.buf = __EROFS_BUF_INITIALIZER;
+ erofs_init_metabuf(&it.it.buf, it.it.sb);
it.dentry = dentry;
it.buffer = buffer;
it.buffer_size = buffer_size;
it.buffer_ofs = 0;
- it.it.sb = dentry->d_sb;
-
ret = inline_listxattr(&it);
if (ret >= 0 || ret == -ENOATTR)
ret = shared_listxattr(&it);
--
2.19.1.6.gb485710b
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH v5 2/6] erofs: enhance erofs_xattr_iter_fixup() helper
2023-06-01 2:43 [PATCH v5 0/6] erofs: cleanup of xattr handling Jingbo Xu
2023-06-01 2:43 ` [PATCH v5 1/6] erofs: convert erofs_read_metabuf() to erofs_bread() for xattr Jingbo Xu
@ 2023-06-01 2:43 ` Jingbo Xu
2023-06-01 3:03 ` Gao Xiang
2023-06-01 2:43 ` [PATCH v5 3/6] erofs: unify xattr_iter structures Jingbo Xu
` (3 subsequent siblings)
5 siblings, 1 reply; 12+ messages in thread
From: Jingbo Xu @ 2023-06-01 2:43 UTC (permalink / raw)
To: xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
Enhance erofs_xattr_iter_fixup() helper so that it could be reused in
the situation where it.ofs could not span the block boundary.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
---
fs/erofs/xattr.c | 73 ++++++++++++++++++++----------------------------
1 file changed, 31 insertions(+), 42 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index d9e041d27a35..0fd574e94c8b 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -29,6 +29,24 @@ struct xattr_iter {
unsigned int ofs;
};
+static inline 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;
+ }
+
+ it->blkaddr += erofs_blknr(it->sb, it->ofs);
+ it->kaddr = erofs_bread(&it->buf, 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 erofs_init_inode_xattrs(struct inode *inode)
{
struct erofs_inode *const vi = EROFS_I(inode);
@@ -80,6 +98,7 @@ static int erofs_init_inode_xattrs(struct inode *inode)
goto out_unlock;
}
+ it.sb = sb;
it.buf = __EROFS_BUF_INITIALIZER;
erofs_init_metabuf(&it.buf, sb);
it.blkaddr = erofs_blknr(sb, erofs_iloc(inode) + vi->inode_isize);
@@ -106,18 +125,11 @@ 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_bread(&it.buf, ++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(&it, true);
+ 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));
@@ -150,19 +162,6 @@ 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_bread(&it->buf, 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)
{
@@ -199,7 +198,7 @@ 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, false);
if (err)
return err;
@@ -234,14 +233,9 @@ 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(it, true);
+ if (err)
+ goto out;
slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
entry.e_name_len - processed);
@@ -269,14 +263,9 @@ 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(it, true);
+ 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] 12+ messages in thread* [PATCH v5 3/6] erofs: unify xattr_iter structures
2023-06-01 2:43 [PATCH v5 0/6] erofs: cleanup of xattr handling Jingbo Xu
2023-06-01 2:43 ` [PATCH v5 1/6] erofs: convert erofs_read_metabuf() to erofs_bread() for xattr Jingbo Xu
2023-06-01 2:43 ` [PATCH v5 2/6] erofs: enhance erofs_xattr_iter_fixup() helper Jingbo Xu
@ 2023-06-01 2:43 ` Jingbo Xu
2023-06-01 3:26 ` Gao Xiang
2023-06-01 2:43 ` [PATCH v5 4/6] erofs: make the size of read data stored in buffer_ofs Jingbo Xu
` (2 subsequent siblings)
5 siblings, 1 reply; 12+ messages in thread
From: Jingbo Xu @ 2023-06-01 2:43 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 | 149 ++++++++++++++++++++---------------------------
1 file changed, 63 insertions(+), 86 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 0fd574e94c8b..a691d539ae4f 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -20,16 +20,25 @@ 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;
+
+ /* getxattr */
+ int index, infix_len;
+ struct qstr name;
+
+ /* listxattr */
+ struct dentry *dentry;
};
-static inline int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan)
+static inline int erofs_xattr_iter_fixup(struct erofs_xattr_iter *it, bool nospan)
{
if (it->ofs < it->sb->s_blocksize)
return 0;
@@ -50,7 +59,7 @@ static inline int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan)
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;
@@ -154,15 +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);
@@ -189,7 +198,7 @@ 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)
{
@@ -280,18 +289,10 @@ 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);
@@ -309,11 +310,9 @@ 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);
@@ -325,32 +324,27 @@ 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);
}
@@ -361,40 +355,40 @@ 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_bread(&it->it.buf, it->it.blkaddr, EROFS_KMAP);
- if (IS_ERR(it->it.kaddr))
- return PTR_ERR(it->it.kaddr);
+ it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
+ it->ofs = erofs_xattr_blkoff(sb, xsid);
+ it->kaddr = erofs_bread(&it->buf, it->blkaddr, EROFS_KMAP);
+ if (IS_ERR(it->kaddr))
+ return PTR_ERR(it->kaddr);
- ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL);
+ ret = xattr_foreach(it, &find_xattr_handlers, NULL);
if (ret != -ENOATTR)
break;
}
@@ -416,7 +410,7 @@ 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;
@@ -426,22 +420,21 @@ int erofs_getxattr(struct inode *inode, int index,
return ret;
it.index = index;
- it.name.len = strlen(name);
+ it.name = (struct qstr)QSTR_INIT(name, strlen(name));
if (it.name.len > EROFS_NAME_LEN)
return -ERANGE;
- it.it.sb = inode->i_sb;
- it.it.buf = __EROFS_BUF_INITIALIZER;
- erofs_init_metabuf(&it.it.buf, it.it.sb);
- it.name.name = name;
-
+ it.sb = inode->i_sb;
+ it.buf = __EROFS_BUF_INITIALIZER;
+ erofs_init_metabuf(&it.buf, it.sb);
it.buffer = buffer;
it.buffer_size = buffer_size;
+ it.buffer_ofs = 0;
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;
}
@@ -487,25 +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);
@@ -537,23 +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;
}
@@ -565,41 +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_bread(&it->it.buf, it->it.blkaddr, EROFS_KMAP);
- if (IS_ERR(it->it.kaddr))
- return PTR_ERR(it->it.kaddr);
+ it->blkaddr = erofs_xattr_blkaddr(sb, xsid);
+ it->ofs = erofs_xattr_blkoff(sb, xsid);
+ it->kaddr = erofs_bread(&it->buf, it->blkaddr, EROFS_KMAP);
+ if (IS_ERR(it->kaddr))
+ return PTR_ERR(it->kaddr);
- ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL);
+ ret = xattr_foreach(it, &list_xattr_handlers, NULL);
if (ret)
break;
}
@@ -610,7 +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)
@@ -618,9 +595,9 @@ ssize_t erofs_listxattr(struct dentry *dentry,
if (ret)
return ret;
- it.it.sb = dentry->d_sb;
- it.it.buf = __EROFS_BUF_INITIALIZER;
- erofs_init_metabuf(&it.it.buf, it.it.sb);
+ it.sb = dentry->d_sb;
+ it.buf = __EROFS_BUF_INITIALIZER;
+ erofs_init_metabuf(&it.buf, it.sb);
it.dentry = dentry;
it.buffer = buffer;
it.buffer_size = buffer_size;
@@ -629,7 +606,7 @@ ssize_t erofs_listxattr(struct dentry *dentry,
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] 12+ messages in thread* [PATCH v5 4/6] erofs: make the size of read data stored in buffer_ofs
2023-06-01 2:43 [PATCH v5 0/6] erofs: cleanup of xattr handling Jingbo Xu
` (2 preceding siblings ...)
2023-06-01 2:43 ` [PATCH v5 3/6] erofs: unify xattr_iter structures Jingbo Xu
@ 2023-06-01 2:43 ` Jingbo Xu
2023-06-01 3:29 ` Gao Xiang
2023-06-01 2:43 ` [PATCH v5 5/6] erofs: unify inline/share xattr iterators for listxattr/getxattr Jingbo Xu
2023-06-01 2:43 ` [PATCH v5 6/6] erofs: use separate xattr parsers " Jingbo Xu
5 siblings, 1 reply; 12+ messages in thread
From: Jingbo Xu @ 2023-06-01 2:43 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 a691d539ae4f..19f9bf67440c 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -337,7 +337,7 @@ 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;
}
@@ -370,7 +370,7 @@ 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)
@@ -392,7 +392,7 @@ 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] 12+ messages in thread* Re: [PATCH v5 4/6] erofs: make the size of read data stored in buffer_ofs
2023-06-01 2:43 ` [PATCH v5 4/6] erofs: make the size of read data stored in buffer_ofs Jingbo Xu
@ 2023-06-01 3:29 ` Gao Xiang
0 siblings, 0 replies; 12+ messages in thread
From: Gao Xiang @ 2023-06-01 3:29 UTC (permalink / raw)
To: Jingbo Xu, xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
On 2023/6/1 10:43, Jingbo Xu wrote:
> 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>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Thanks,
Gao Xiang
> ---
> 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 a691d539ae4f..19f9bf67440c 100644
> --- a/fs/erofs/xattr.c
> +++ b/fs/erofs/xattr.c
> @@ -337,7 +337,7 @@ 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;
> }
>
> @@ -370,7 +370,7 @@ 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)
> @@ -392,7 +392,7 @@ 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)
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH v5 5/6] erofs: unify inline/share xattr iterators for listxattr/getxattr
2023-06-01 2:43 [PATCH v5 0/6] erofs: cleanup of xattr handling Jingbo Xu
` (3 preceding siblings ...)
2023-06-01 2:43 ` [PATCH v5 4/6] erofs: make the size of read data stored in buffer_ofs Jingbo Xu
@ 2023-06-01 2:43 ` Jingbo Xu
2023-06-01 2:43 ` [PATCH v5 6/6] erofs: use separate xattr parsers " Jingbo Xu
5 siblings, 0 replies; 12+ messages in thread
From: Jingbo Xu @ 2023-06-01 2:43 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 | 209 ++++++++++++++++++-----------------------------
1 file changed, 78 insertions(+), 131 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 19f9bf67440c..64180e83a63e 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;
@@ -171,29 +158,6 @@ 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_bread(&it->buf, 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.
@@ -355,46 +319,6 @@ 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_bread(&it->buf, 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);
@@ -405,39 +329,6 @@ 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;
-
- ret = erofs_init_inode_xattrs(inode);
- if (ret)
- return ret;
-
- it.index = index;
- it.name = (struct qstr)QSTR_INIT(name, strlen(name));
- if (it.name.len > EROFS_NAME_LEN)
- return -ERANGE;
-
- it.sb = inode->i_sb;
- it.buf = __EROFS_BUF_INITIALIZER;
- erofs_init_metabuf(&it.buf, it.sb);
- it.buffer = buffer;
- it.buffer_size = buffer_size;
- it.buffer_ofs = 0;
-
- 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 +433,98 @@ 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 inode *inode, bool getxattr)
{
+ struct erofs_inode *const vi = EROFS_I(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(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 = 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 ((getxattr && ret != -ENOATTR) || (!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 *inode, bool getxattr)
{
- struct inode *const inode = d_inode(it->dentry);
struct erofs_inode *const vi = EROFS_I(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 = 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_bread(&it->buf, 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 ((getxattr && ret != -ENOATTR) || (!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;
+
+ ret = erofs_init_inode_xattrs(inode);
+ if (ret)
+ return ret;
+
+ it.index = index;
+ it.name = (struct qstr)QSTR_INIT(name, strlen(name));
+ if (it.name.len > EROFS_NAME_LEN)
+ return -ERANGE;
+
+ it.sb = inode->i_sb;
+ it.buf = __EROFS_BUF_INITIALIZER;
+ erofs_init_metabuf(&it.buf, it.sb);
+ it.buffer = buffer;
+ it.buffer_size = buffer_size;
+ it.buffer_ofs = 0;
+
+ ret = erofs_iter_inline_xattr(&it, inode, true);
+ if (ret == -ENOATTR)
+ ret = erofs_iter_shared_xattr(&it, inode, true);
+ erofs_put_metabuf(&it.buf);
+ return ret ? ret : it.buffer_ofs;
}
ssize_t erofs_listxattr(struct dentry *dentry,
@@ -588,8 +532,9 @@ ssize_t erofs_listxattr(struct dentry *dentry,
{
int ret;
struct erofs_xattr_iter it;
+ struct inode *inode = d_inode(dentry);
- ret = erofs_init_inode_xattrs(d_inode(dentry));
+ ret = erofs_init_inode_xattrs(inode);
if (ret == -ENOATTR)
return 0;
if (ret)
@@ -603,11 +548,13 @@ ssize_t erofs_listxattr(struct dentry *dentry,
it.buffer_size = buffer_size;
it.buffer_ofs = 0;
- ret = inline_listxattr(&it);
- if (ret >= 0 || ret == -ENOATTR)
- ret = shared_listxattr(&it);
+ ret = erofs_iter_inline_xattr(&it, inode, false);
+ if (!ret || ret == -ENOATTR)
+ ret = erofs_iter_shared_xattr(&it, inode, false);
+ 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] 12+ messages in thread* [PATCH v5 6/6] erofs: use separate xattr parsers for listxattr/getxattr
2023-06-01 2:43 [PATCH v5 0/6] erofs: cleanup of xattr handling Jingbo Xu
` (4 preceding siblings ...)
2023-06-01 2:43 ` [PATCH v5 5/6] erofs: unify inline/share xattr iterators for listxattr/getxattr Jingbo Xu
@ 2023-06-01 2:43 ` Jingbo Xu
2023-06-01 3:37 ` Gao Xiang
5 siblings, 1 reply; 12+ messages in thread
From: Jingbo Xu @ 2023-06-01 2:43 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 | 359 +++++++++++++++++++----------------------------
1 file changed, 142 insertions(+), 217 deletions(-)
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index 64180e83a63e..1b65e74cb4a0 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, next_ofs;
char *buffer;
int buffer_size, buffer_ofs;
@@ -142,183 +142,6 @@ 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, false);
- 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(it, true);
- 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(it, true);
- 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);
@@ -371,20 +194,57 @@ const struct xattr_handler *erofs_xattr_handlers[] = {
NULL,
};
-static int xattr_entrylist(struct erofs_xattr_iter *it,
- struct erofs_xattr_entry *entry)
+static int erofs_xattr_body(struct erofs_xattr_iter *it,
+ unsigned int len, bool copy)
{
- unsigned int base_index = entry->e_name_index;
- unsigned int prefix_len, infix_len = 0;
+ unsigned int slice, processed = 0;
+ void *buf;
+ int err;
+
+ while (processed < len) {
+ err = erofs_xattr_iter_fixup(it, true);
+ if (err)
+ return err;
+
+ buf = it->kaddr + it->ofs;
+ slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
+ len - processed);
+ if (copy) {
+ memcpy(it->buffer + it->buffer_ofs, buf, slice);
+ it->buffer_ofs += slice;
+ } else if (memcmp(it->name.name + it->infix_len + processed,
+ buf, slice)) {
+ return -ENOATTR;
+ }
+ 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)
+{
+ struct erofs_xattr_entry entry;
+ unsigned int base_index, prefix_len, infix_len = 0;
const char *prefix, *infix = NULL;
+ int err;
- if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
+ /* 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) {
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;
@@ -392,53 +252,99 @@ 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, true);
+ 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->next_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
-};
+ /* 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, false);
+ 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, true);
+ it->ofs = EROFS_XATTR_ALIGN(it->ofs);
+ return err;
+out:
+ it->ofs = it->next_ofs;
+ return err;
+}
static int erofs_iter_inline_xattr(struct erofs_xattr_iter *it,
struct inode *inode, bool getxattr)
{
struct erofs_inode *const vi = EROFS_I(inode);
- const struct xattr_iter_handlers *op;
- unsigned int xattr_header_sz, remaining;
+ unsigned int xattr_header_sz, remaining, entry_sz;
erofs_off_t pos;
int ret;
@@ -457,10 +363,24 @@ static int erofs_iter_inline_xattr(struct erofs_xattr_iter *it,
return PTR_ERR(it->kaddr);
remaining = vi->xattr_isize - xattr_header_sz;
- op = getxattr ? &find_xattr_handlers : &list_xattr_handlers;
-
while (remaining) {
- ret = xattr_foreach(it, op, &remaining);
+ ret = erofs_xattr_iter_fixup(it, false);
+ if (ret)
+ return ret;
+
+ entry_sz = erofs_xattr_entry_size(it->kaddr + it->ofs);
+ /* xattr on-disk corruption: xattr entry beyond xattr_isize */
+ if (remaining < entry_sz) {
+ DBG_BUGON(1);
+ return -EFSCORRUPTED;
+ }
+ remaining -= entry_sz;
+ it->next_ofs = it->ofs + entry_sz;
+
+ if (getxattr)
+ ret = erofs_getxattr_foreach(it);
+ else
+ ret = erofs_listxattr_foreach(it);
if ((getxattr && ret != -ENOATTR) || (!getxattr && ret))
break;
}
@@ -472,12 +392,9 @@ static int erofs_iter_shared_xattr(struct erofs_xattr_iter *it,
{
struct erofs_inode *const vi = EROFS_I(inode);
struct super_block *const sb = it->sb;
- const struct xattr_iter_handlers *op;
unsigned int i, xsid;
int ret = -ENOATTR;
- op = 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 +404,15 @@ 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);
+ ret = erofs_xattr_iter_fixup(it, false);
+ if (ret)
+ return ret;
+ it->next_ofs = it->ofs + erofs_xattr_entry_size(it->kaddr + it->ofs);
+
+ if (getxattr)
+ ret = erofs_getxattr_foreach(it);
+ else
+ ret = erofs_listxattr_foreach(it);
if ((getxattr && ret != -ENOATTR) || (!getxattr && ret))
break;
}
--
2.19.1.6.gb485710b
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH v5 6/6] erofs: use separate xattr parsers for listxattr/getxattr
2023-06-01 2:43 ` [PATCH v5 6/6] erofs: use separate xattr parsers " Jingbo Xu
@ 2023-06-01 3:37 ` Gao Xiang
0 siblings, 0 replies; 12+ messages in thread
From: Gao Xiang @ 2023-06-01 3:37 UTC (permalink / raw)
To: Jingbo Xu, xiang, chao, huyue2, linux-erofs; +Cc: linux-kernel
On 2023/6/1 10:43, Jingbo Xu wrote:
> 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>
> ---
...
> +static int erofs_xattr_body(struct erofs_xattr_iter *it,
> + unsigned int len, bool copy)
It might be better to call it as "erofs_xattr_handle_string".
> {
> - unsigned int base_index = entry->e_name_index;
> - unsigned int prefix_len, infix_len = 0;
> + unsigned int slice, processed = 0;
> + void *buf;
> + int err;
> +
> + while (processed < len) {
> + err = erofs_xattr_iter_fixup(it, true);
> + if (err)
> + return err;
> +
> + buf = it->kaddr + it->ofs;
> + slice = min_t(unsigned int, it->sb->s_blocksize - it->ofs,
> + len - processed);
> + if (copy) {
> + memcpy(it->buffer + it->buffer_ofs, buf, slice);
> + it->buffer_ofs += slice;
> + } else if (memcmp(it->name.name + it->infix_len + processed,
> + buf, slice)) {
> + return -ENOATTR;
> + }
> + 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)
> +{
> + struct erofs_xattr_entry entry;
> + unsigned int base_index, prefix_len, infix_len = 0;
> const char *prefix, *infix = NULL;
> + int err;
>
> - if (entry->e_name_index & EROFS_XATTR_LONG_PREFIX) {
> + /* 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) {
> 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;
> @@ -392,53 +252,99 @@ 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, true);
> + 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->next_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
> -};
> + /* 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;
please use "} else if {" here
> + it->infix_len = 0;
> + }
> +
Thanks,
Gao Xiang
^ permalink raw reply [flat|nested] 12+ messages in thread