From fd3562136303f9b47b74dbb8fa7349d3afe5c3e7 Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Fri, 14 Jan 2005 23:37:09 -0800 Subject: [PATCH] ext3/EA: Cleanup and prepare ext3 for in-inode xattrs Clean up several things in the xattr code, and prepare it for in-inode attributes: * Add the ext3_xattr_check_names, ext3_xattr_check_block, and ext3_xattr_check_entry functions for checking xattr data structures. * Add the ext3_xattr_find_entry, ext3_xattr_list_entries, and ext3_xattr_set_entry functions for manipulating xattr entries. Switch to using these functions in ext3_xattr_get, ext3_xattr_list, and ext3_xattr_set_handle. * Merge ext3_xattr_set_handle and ext3_xattr_set_handle2. * Rename the HDR and FIRST_ENTRY macros. * We have no way to deal with a ext3_xattr_cache_insert failure, so make it return void. * Make the debug messages more useful. Signed-off-by: Andreas Gruenbacher Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/ext2/xattr.c | 2 +- fs/ext3/xattr.c | 715 ++++++++++++++++++++++++++++---------------------------- 2 files changed, 354 insertions(+), 363 deletions(-) diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c index 04cd1840195a9e..758f797c9be4e6 100644 --- a/fs/ext2/xattr.c +++ b/fs/ext2/xattr.c @@ -24,7 +24,7 @@ * * +------------------+ * | header | - * ¦ entry 1 | | + * | entry 1 | | * | entry 2 | | growing downwards * | entry 3 | v * | four null bytes | diff --git a/fs/ext3/xattr.c b/fs/ext3/xattr.c index 09ab967231286a..2f06c1c9f7f266 100644 --- a/fs/ext3/xattr.c +++ b/fs/ext3/xattr.c @@ -24,7 +24,7 @@ * * +------------------+ * | header | - * ¦ entry 1 | | + * | entry 1 | | * | entry 2 | | growing downwards * | entry 3 | v * | four null bytes | @@ -64,9 +64,9 @@ #include "xattr.h" #include "acl.h" -#define HDR(bh) ((struct ext3_xattr_header *)((bh)->b_data)) +#define BHDR(bh) ((struct ext3_xattr_header *)((bh)->b_data)) #define ENTRY(ptr) ((struct ext3_xattr_entry *)(ptr)) -#define FIRST_ENTRY(bh) ENTRY(HDR(bh)+1) +#define BFIRST(bh) ENTRY(BHDR(bh)+1) #define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0) #ifdef EXT3_XATTR_DEBUG @@ -89,11 +89,7 @@ # define ea_bdebug(f...) #endif -static int ext3_xattr_set_handle2(handle_t *, struct inode *, - struct buffer_head *, - struct ext3_xattr_header *); - -static int ext3_xattr_cache_insert(struct buffer_head *); +static void ext3_xattr_cache_insert(struct buffer_head *); static struct buffer_head *ext3_xattr_cache_find(struct inode *, struct ext3_xattr_header *, struct mb_cache_entry **); @@ -148,6 +144,68 @@ ext3_listxattr(struct dentry *dentry, char *buffer, size_t size) return ext3_xattr_list(dentry->d_inode, buffer, size); } +static int +ext3_xattr_check_names(struct ext3_xattr_entry *entry, void *end) +{ + while (!IS_LAST_ENTRY(entry)) { + struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(entry); + if ((void *)next >= end) + return -EIO; + entry = next; + } + return 0; +} + +static inline int +ext3_xattr_check_block(struct buffer_head *bh) +{ + int error; + + if (BHDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || + BHDR(bh)->h_blocks != cpu_to_le32(1)) + return -EIO; + error = ext3_xattr_check_names(BFIRST(bh), bh->b_data + bh->b_size); + return error; +} + +static inline int +ext3_xattr_check_entry(struct ext3_xattr_entry *entry, size_t size) +{ + size_t value_size = le32_to_cpu(entry->e_value_size); + + if (entry->e_value_block != 0 || value_size > size || + le16_to_cpu(entry->e_value_offs) + value_size > size) + return -EIO; + return 0; +} + +static int +ext3_xattr_find_entry(struct ext3_xattr_entry **pentry, int name_index, + const char *name, size_t size, int sorted) +{ + struct ext3_xattr_entry *entry; + size_t name_len; + int cmp = 1; + + if (name == NULL) + return -EINVAL; + name_len = strlen(name); + entry = *pentry; + for (; !IS_LAST_ENTRY(entry); entry = EXT3_XATTR_NEXT(entry)) { + cmp = name_index - entry->e_name_index; + if (!cmp) + cmp = name_len - entry->e_name_len; + if (!cmp) + cmp = memcmp(name, entry->e_name, name_len); + if (cmp <= 0 && (sorted || cmp == 0)) + break; + } + *pentry = entry; + if (!cmp && ext3_xattr_check_entry(entry, size)) + return -EIO; + return cmp ? -ENODATA : 0; +} + /* * ext3_xattr_get() * @@ -164,8 +222,7 @@ ext3_xattr_get(struct inode *inode, int name_index, const char *name, { struct buffer_head *bh = NULL; struct ext3_xattr_entry *entry; - size_t name_len, size; - char *end; + size_t size; int error; ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld", @@ -179,78 +236,65 @@ ext3_xattr_get(struct inode *inode, int name_index, const char *name, goto cleanup; ea_idebug(inode, "reading block %d", EXT3_I(inode)->i_file_acl); bh = sb_bread(inode->i_sb, EXT3_I(inode)->i_file_acl); - error = -EIO; if (!bh) goto cleanup; ea_bdebug(bh, "b_count=%d, refcount=%d", - atomic_read(&(bh->b_count)), le32_to_cpu(HDR(bh)->h_refcount)); - end = bh->b_data + bh->b_size; - if (HDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || - HDR(bh)->h_blocks != cpu_to_le32(1)) { -bad_block: ext3_error(inode->i_sb, "ext3_xattr_get", - "inode %ld: bad block %d", inode->i_ino, - EXT3_I(inode)->i_file_acl); + atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); + if (ext3_xattr_check_block(bh)) { +bad_block: ext3_error(inode->i_sb, __FUNCTION__, + "inode %ld: bad block %d", inode->i_ino, + EXT3_I(inode)->i_file_acl); error = -EIO; goto cleanup; } - /* find named attribute */ - name_len = strlen(name); - - error = -ERANGE; - if (name_len > 255) - goto cleanup; - entry = FIRST_ENTRY(bh); - while (!IS_LAST_ENTRY(entry)) { - struct ext3_xattr_entry *next = - EXT3_XATTR_NEXT(entry); - if ((char *)next >= end) - goto bad_block; - if (name_index == entry->e_name_index && - name_len == entry->e_name_len && - memcmp(name, entry->e_name, name_len) == 0) - goto found; - entry = next; - } - /* Check the remaining name entries */ - while (!IS_LAST_ENTRY(entry)) { - struct ext3_xattr_entry *next = - EXT3_XATTR_NEXT(entry); - if ((char *)next >= end) - goto bad_block; - entry = next; - } - if (ext3_xattr_cache_insert(bh)) - ea_idebug(inode, "cache insert failed"); - error = -ENODATA; - goto cleanup; -found: - /* check the buffer size */ - if (entry->e_value_block != 0) + ext3_xattr_cache_insert(bh); + entry = BFIRST(bh); + error = ext3_xattr_find_entry(&entry, name_index, name, bh->b_size, 1); + if (error == -EIO) goto bad_block; + if (error) + goto cleanup; size = le32_to_cpu(entry->e_value_size); - if (size > inode->i_sb->s_blocksize || - le16_to_cpu(entry->e_value_offs) + size > inode->i_sb->s_blocksize) - goto bad_block; - - if (ext3_xattr_cache_insert(bh)) - ea_idebug(inode, "cache insert failed"); if (buffer) { error = -ERANGE; if (size > buffer_size) goto cleanup; - /* return value of attribute */ memcpy(buffer, bh->b_data + le16_to_cpu(entry->e_value_offs), - size); + size); } error = size; cleanup: brelse(bh); up_read(&EXT3_I(inode)->xattr_sem); - return error; } +static int +ext3_xattr_list_entries(struct inode *inode, struct ext3_xattr_entry *entry, + char *buffer, size_t buffer_size) +{ + size_t rest = buffer_size; + + for (; !IS_LAST_ENTRY(entry); entry = EXT3_XATTR_NEXT(entry)) { + struct xattr_handler *handler = + ext3_xattr_handler(entry->e_name_index); + + if (handler) { + size_t size = handler->list(inode, buffer, rest, + entry->e_name, + entry->e_name_len); + if (buffer) { + if (size > rest) + return -ERANGE; + buffer += size; + } + rest -= size; + } + } + return buffer_size - rest; +} + /* * ext3_xattr_list() * @@ -265,9 +309,6 @@ int ext3_xattr_list(struct inode *inode, char *buffer, size_t buffer_size) { struct buffer_head *bh = NULL; - struct ext3_xattr_entry *entry; - char *end; - size_t rest = buffer_size; int error; ea_idebug(inode, "buffer=%p, buffer_size=%ld", @@ -283,50 +324,16 @@ ext3_xattr_list(struct inode *inode, char *buffer, size_t buffer_size) if (!bh) goto cleanup; ea_bdebug(bh, "b_count=%d, refcount=%d", - atomic_read(&(bh->b_count)), le32_to_cpu(HDR(bh)->h_refcount)); - end = bh->b_data + bh->b_size; - if (HDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || - HDR(bh)->h_blocks != cpu_to_le32(1)) { -bad_block: ext3_error(inode->i_sb, "ext3_xattr_list", - "inode %ld: bad block %d", inode->i_ino, - EXT3_I(inode)->i_file_acl); + atomic_read(&(bh->b_count)), le32_to_cpu(BHDR(bh)->h_refcount)); + if (ext3_xattr_check_block(bh)) { + ext3_error(inode->i_sb, __FUNCTION__, + "inode %ld: bad block %d", inode->i_ino, + EXT3_I(inode)->i_file_acl); error = -EIO; goto cleanup; } - - /* check the on-disk data structure */ - entry = FIRST_ENTRY(bh); - while (!IS_LAST_ENTRY(entry)) { - struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(entry); - - if ((char *)next >= end) - goto bad_block; - entry = next; - } - if (ext3_xattr_cache_insert(bh)) - ea_idebug(inode, "cache insert failed"); - - /* list the attribute names */ - for (entry = FIRST_ENTRY(bh); !IS_LAST_ENTRY(entry); - entry = EXT3_XATTR_NEXT(entry)) { - struct xattr_handler *handler = - ext3_xattr_handler(entry->e_name_index); - - if (handler) { - size_t size = handler->list(inode, buffer, rest, - entry->e_name, - entry->e_name_len); - if (buffer) { - if (size > rest) { - error = -ERANGE; - goto cleanup; - } - buffer += size; - } - rest -= size; - } - } - error = buffer_size - rest; /* total size */ + ext3_xattr_cache_insert(bh); + error = ext3_xattr_list_entries(inode, BFIRST(bh), buffer, buffer_size); cleanup: brelse(bh); @@ -366,8 +373,8 @@ ext3_xattr_release_block(handle_t *handle, struct inode *inode, struct mb_cache_entry *ce = NULL; ce = mb_cache_entry_get(ext3_xattr_cache, bh->b_bdev, bh->b_blocknr); - if (HDR(bh)->h_refcount == cpu_to_le32(1)) { - ea_bdebug(bh, "freeing"); + if (BHDR(bh)->h_refcount == cpu_to_le32(1)) { + ea_bdebug(bh, "refcount now=0; freeing"); if (ce) mb_cache_entry_free(ce); ext3_free_blocks(handle, inode, bh->b_blocknr, 1); @@ -376,20 +383,137 @@ ext3_xattr_release_block(handle_t *handle, struct inode *inode, } else { if (ext3_journal_get_write_access(handle, bh) == 0) { lock_buffer(bh); - HDR(bh)->h_refcount = cpu_to_le32( - le32_to_cpu(HDR(bh)->h_refcount) - 1); + BHDR(bh)->h_refcount = cpu_to_le32( + le32_to_cpu(BHDR(bh)->h_refcount) - 1); ext3_journal_dirty_metadata(handle, bh); if (IS_SYNC(inode)) handle->h_sync = 1; DQUOT_FREE_BLOCK(inode, 1); unlock_buffer(bh); - ea_bdebug(bh, "refcount now=%d", - le32_to_cpu(HDR(bh)->h_refcount) - 1); + ea_bdebug(bh, "refcount now=%d; releasing", + le32_to_cpu(BHDR(bh)->h_refcount)); } if (ce) mb_cache_entry_release(ce); } } + +struct ext3_xattr_info { + int name_index; + const char *name; + const void *value; + size_t value_len; +}; + +struct ext3_xattr_search { + struct ext3_xattr_entry *first; + void *base; + void *end; + struct ext3_xattr_entry *here; + int not_found; +}; + +static int +ext3_xattr_set_entry(struct ext3_xattr_info *i, struct ext3_xattr_search *s) +{ + struct ext3_xattr_entry *last; + size_t free, min_offs = s->end - s->base, name_len = strlen(i->name); + + /* Compute min_offs and last. */ + last = s->first; + for (; !IS_LAST_ENTRY(last); last = EXT3_XATTR_NEXT(last)) { + if (!last->e_value_block && last->e_value_size) { + size_t offs = le16_to_cpu(last->e_value_offs); + if (offs < min_offs) + min_offs = offs; + } + } + free = min_offs - ((void *)last - s->base) - sizeof(__u32); + if (!s->not_found) { + if (!s->here->e_value_block && s->here->e_value_size) { + size_t size = le32_to_cpu(s->here->e_value_size); + free += EXT3_XATTR_SIZE(size); + } + free += EXT3_XATTR_LEN(name_len); + } + if (i->value) { + if (free < EXT3_XATTR_SIZE(i->value_len) || + free < EXT3_XATTR_LEN(name_len) + + EXT3_XATTR_SIZE(i->value_len)) + return -ENOSPC; + } + + if (i->value && s->not_found) { + /* Insert the new name. */ + size_t size = EXT3_XATTR_LEN(name_len); + size_t rest = (void *)last - (void *)s->here + sizeof(__u32); + memmove((void *)s->here + size, s->here, rest); + memset(s->here, 0, size); + s->here->e_name_index = i->name_index; + s->here->e_name_len = name_len; + memcpy(s->here->e_name, i->name, name_len); + } else { + if (!s->here->e_value_block && s->here->e_value_size) { + void *first_val = s->base + min_offs; + size_t offs = le16_to_cpu(s->here->e_value_offs); + void *val = s->base + offs; + size_t size = EXT3_XATTR_SIZE( + le32_to_cpu(s->here->e_value_size)); + + if (i->value && size == EXT3_XATTR_SIZE(i->value_len)) { + /* The old and the new value have the same + size. Just replace. */ + s->here->e_value_size = + cpu_to_le32(i->value_len); + memset(val + size - EXT3_XATTR_PAD, 0, + EXT3_XATTR_PAD); /* Clear pad bytes. */ + memcpy(val, i->value, i->value_len); + return 0; + } + + /* Remove the old value. */ + memmove(first_val + size, first_val, val - first_val); + memset(first_val, 0, size); + s->here->e_value_size = 0; + s->here->e_value_offs = 0; + min_offs += size; + + /* Adjust all value offsets. */ + last = s->first; + while (!IS_LAST_ENTRY(last)) { + size_t o = le16_to_cpu(last->e_value_offs); + if (!last->e_value_block && + last->e_value_size && o < offs) + last->e_value_offs = + cpu_to_le16(o + size); + last = EXT3_XATTR_NEXT(last); + } + } + if (!i->value) { + /* Remove the old name. */ + size_t size = EXT3_XATTR_LEN(name_len); + last = ENTRY((void *)last - size); + memmove(s->here, (void *)s->here + size, + (void *)last - (void *)s->here + sizeof(__u32)); + memset(last, 0, size); + } + } + + if (i->value) { + /* Insert the new value. */ + s->here->e_value_size = cpu_to_le32(i->value_len); + if (i->value_len) { + size_t size = EXT3_XATTR_SIZE(i->value_len); + void *val = s->base + min_offs - size; + s->here->e_value_offs = cpu_to_le16(min_offs - size); + memset(val + size - EXT3_XATTR_PAD, 0, + EXT3_XATTR_PAD); /* Clear the pad bytes. */ + memcpy(val, i->value, i->value_len); + } + } + return 0; +} + /* * ext3_xattr_set_handle() * @@ -408,23 +532,24 @@ ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, int flags) { struct super_block *sb = inode->i_sb; - struct buffer_head *bh = NULL; - struct ext3_xattr_header *header = NULL; - struct ext3_xattr_entry *here, *last; - size_t name_len, free, min_offs = sb->s_blocksize; - int not_found = 1, error; - char *end; + struct buffer_head *old_bh = NULL, *new_bh = NULL; + struct ext3_xattr_info i = { + .name_index = name_index, + .name = name, + .value = value, + .value_len = value_len, + }; + struct ext3_xattr_search s = { + .not_found = 1, + }; + struct mb_cache_entry *ce = NULL; + int error; + +#define header ((struct ext3_xattr_header *)(s.base)) /* * header -- Points either into bh, or to a temporarily * allocated buffer. - * here -- The named entry found, or the place for inserting, within - * the block pointed to by header. - * last -- Points right after the last named entry within the block - * pointed to by header. - * min_offs -- The offset of the first value (values are aligned - * towards the end of the block). - * end -- Points right after the block pointed to by header. */ ea_idebug(inode, "name=%d.%s, value=%p, value_len=%ld", @@ -434,77 +559,38 @@ ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, return -EROFS; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) return -EPERM; - if (value == NULL) - value_len = 0; - if (name == NULL) - return -EINVAL; - name_len = strlen(name); - if (name_len > 255 || value_len > sb->s_blocksize) - return -ERANGE; + if (i.value == NULL) + i.value_len = 0; down_write(&EXT3_I(inode)->xattr_sem); if (EXT3_I(inode)->i_file_acl) { /* The inode already has an extended attribute block. */ - bh = sb_bread(sb, EXT3_I(inode)->i_file_acl); + old_bh = sb_bread(sb, EXT3_I(inode)->i_file_acl); error = -EIO; - if (!bh) + if (!old_bh) goto cleanup; - ea_bdebug(bh, "b_count=%d, refcount=%d", - atomic_read(&(bh->b_count)), - le32_to_cpu(HDR(bh)->h_refcount)); - header = HDR(bh); - end = bh->b_data + bh->b_size; - if (header->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || - header->h_blocks != cpu_to_le32(1)) { -bad_block: ext3_error(sb, "ext3_xattr_set", + ea_bdebug(old_bh, "b_count=%d, refcount=%d", + atomic_read(&(old_bh->b_count)), + le32_to_cpu(BHDR(old_bh)->h_refcount)); + if (ext3_xattr_check_block(old_bh)) { +bad_block: ext3_error(sb, __FUNCTION__, "inode %ld: bad block %d", inode->i_ino, EXT3_I(inode)->i_file_acl); error = -EIO; goto cleanup; } /* Find the named attribute. */ - here = FIRST_ENTRY(bh); - while (!IS_LAST_ENTRY(here)) { - struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(here); - if ((char *)next >= end) - goto bad_block; - if (!here->e_value_block && here->e_value_size) { - size_t offs = le16_to_cpu(here->e_value_offs); - if (offs < min_offs) - min_offs = offs; - } - not_found = name_index - here->e_name_index; - if (!not_found) - not_found = name_len - here->e_name_len; - if (!not_found) - not_found = memcmp(name, here->e_name,name_len); - if (not_found <= 0) - break; - here = next; - } - last = here; - /* We still need to compute min_offs and last. */ - while (!IS_LAST_ENTRY(last)) { - struct ext3_xattr_entry *next = EXT3_XATTR_NEXT(last); - if ((char *)next >= end) - goto bad_block; - if (!last->e_value_block && last->e_value_size) { - size_t offs = le16_to_cpu(last->e_value_offs); - if (offs < min_offs) - min_offs = offs; - } - last = next; - } - - /* Check whether we have enough space left. */ - free = min_offs - ((char*)last - (char*)header) - sizeof(__u32); - } else { - /* We will use a new extended attribute block. */ - free = sb->s_blocksize - - sizeof(struct ext3_xattr_header) - sizeof(__u32); - here = last = NULL; /* avoid gcc uninitialized warning. */ + s.base = BHDR(old_bh); + s.first = BFIRST(old_bh); + s.end = old_bh->b_data + old_bh->b_size; + s.here = BFIRST(old_bh); + error = ext3_xattr_find_entry(&s.here, name_index, name, + old_bh->b_size, 1); + if (error && error != -ENODATA) + goto cleanup; + s.not_found = error; } - if (not_found) { + if (s.not_found) { /* Request to remove a nonexistent attribute? */ error = -ENODATA; if (flags & XATTR_REPLACE) @@ -517,183 +603,90 @@ bad_block: ext3_error(sb, "ext3_xattr_set", error = -EEXIST; if (flags & XATTR_CREATE) goto cleanup; - if (!here->e_value_block && here->e_value_size) { - size_t size = le32_to_cpu(here->e_value_size); - - if (le16_to_cpu(here->e_value_offs) + size > - sb->s_blocksize || size > sb->s_blocksize) - goto bad_block; - free += EXT3_XATTR_SIZE(size); - } - free += EXT3_XATTR_LEN(name_len); } - error = -ENOSPC; - if (free < EXT3_XATTR_LEN(name_len) + EXT3_XATTR_SIZE(value_len)) - goto cleanup; - - /* Here we know that we can set the new attribute. */ if (header) { - struct mb_cache_entry *ce; - - /* assert(header == HDR(bh)); */ - ce = mb_cache_entry_get(ext3_xattr_cache, bh->b_bdev, - bh->b_blocknr); + /* assert(header == BHDR(old_bh)); */ + ce = mb_cache_entry_get(ext3_xattr_cache, old_bh->b_bdev, + old_bh->b_blocknr); if (header->h_refcount == cpu_to_le32(1)) { - if (ce) + if (ce) { mb_cache_entry_free(ce); - ea_bdebug(bh, "modifying in-place"); - error = ext3_journal_get_write_access(handle, bh); + ce = NULL; + } + ea_bdebug(old_bh, "modifying in-place"); + error = ext3_journal_get_write_access(handle, old_bh); if (error) goto cleanup; - lock_buffer(bh); - /* keep the buffer locked while modifying it. */ + lock_buffer(old_bh); + error = ext3_xattr_set_entry(&i, &s); + if (!error) { + if (!IS_LAST_ENTRY(s.first)) + ext3_xattr_rehash(header, s.here); + ext3_xattr_cache_insert(old_bh); + } + unlock_buffer(old_bh); + if (error == -EIO) + goto bad_block; + if (!error && old_bh && header == BHDR(old_bh)) { + error = ext3_journal_dirty_metadata(handle, + old_bh); + } + if (error) + goto cleanup; + goto inserted; } else { - int offset; + int offset = (char *)s.here - old_bh->b_data; - if (ce) + if (ce) { mb_cache_entry_release(ce); - ea_bdebug(bh, "cloning"); - header = kmalloc(bh->b_size, GFP_KERNEL); + ce = NULL; + } + ea_bdebug(old_bh, "cloning"); + s.base = kmalloc(old_bh->b_size, GFP_KERNEL); + /*assert(header == s.base)*/ error = -ENOMEM; if (header == NULL) goto cleanup; - memcpy(header, HDR(bh), bh->b_size); + memcpy(header, BHDR(old_bh), old_bh->b_size); + s.first = ENTRY(header+1); header->h_refcount = cpu_to_le32(1); - offset = (char *)here - bh->b_data; - here = ENTRY((char *)header + offset); - offset = (char *)last - bh->b_data; - last = ENTRY((char *)header + offset); + s.here = ENTRY(s.base + offset); + s.end = header + old_bh->b_size; } } else { /* Allocate a buffer where we construct the new block. */ - header = kmalloc(sb->s_blocksize, GFP_KERNEL); + s.base = kmalloc(sb->s_blocksize, GFP_KERNEL); + /*assert(header == s.base)*/ error = -ENOMEM; if (header == NULL) goto cleanup; memset(header, 0, sb->s_blocksize); - end = (char *)header + sb->s_blocksize; header->h_magic = cpu_to_le32(EXT3_XATTR_MAGIC); header->h_blocks = header->h_refcount = cpu_to_le32(1); - last = here = ENTRY(header+1); - } - - /* Iff we are modifying the block in-place, bh is locked here. */ - - if (not_found) { - /* Insert the new name. */ - size_t size = EXT3_XATTR_LEN(name_len); - size_t rest = (char *)last - (char *)here; - memmove((char *)here + size, here, rest); - memset(here, 0, size); - here->e_name_index = name_index; - here->e_name_len = name_len; - memcpy(here->e_name, name, name_len); - } else { - if (!here->e_value_block && here->e_value_size) { - char *first_val = (char *)header + min_offs; - size_t offs = le16_to_cpu(here->e_value_offs); - char *val = (char *)header + offs; - size_t size = EXT3_XATTR_SIZE( - le32_to_cpu(here->e_value_size)); - - if (size == EXT3_XATTR_SIZE(value_len)) { - /* The old and the new value have the same - size. Just replace. */ - here->e_value_size = cpu_to_le32(value_len); - memset(val + size - EXT3_XATTR_PAD, 0, - EXT3_XATTR_PAD); /* Clear pad bytes. */ - memcpy(val, value, value_len); - goto skip_replace; - } - - /* Remove the old value. */ - memmove(first_val + size, first_val, val - first_val); - memset(first_val, 0, size); - here->e_value_offs = 0; - min_offs += size; - - /* Adjust all value offsets. */ - last = ENTRY(header+1); - while (!IS_LAST_ENTRY(last)) { - size_t o = le16_to_cpu(last->e_value_offs); - if (!last->e_value_block && o < offs) - last->e_value_offs = - cpu_to_le16(o + size); - last = EXT3_XATTR_NEXT(last); - } - } - if (value == NULL) { - /* Remove the old name. */ - size_t size = EXT3_XATTR_LEN(name_len); - last = ENTRY((char *)last - size); - memmove(here, (char*)here + size, - (char*)last - (char*)here); - memset(last, 0, size); - } - } - - if (value != NULL) { - /* Insert the new value. */ - here->e_value_size = cpu_to_le32(value_len); - if (value_len) { - size_t size = EXT3_XATTR_SIZE(value_len); - char *val = (char *)header + min_offs - size; - here->e_value_offs = - cpu_to_le16((char *)val - (char *)header); - memset(val + size - EXT3_XATTR_PAD, 0, - EXT3_XATTR_PAD); /* Clear the pad bytes. */ - memcpy(val, value, value_len); - } - } - -skip_replace: - if (!IS_LAST_ENTRY(ENTRY(header+1))) - ext3_xattr_rehash(header, here); - if (bh && header == HDR(bh)) { - /* we were modifying in-place. */ - unlock_buffer(bh); - error = ext3_journal_dirty_metadata(handle, bh); - if (error) - goto cleanup; + s.first = ENTRY(header+1); + s.here = ENTRY(header+1); + s.end = (void *)header + sb->s_blocksize; } - error = ext3_xattr_set_handle2(handle, inode, bh, - IS_LAST_ENTRY(ENTRY(header+1)) ? - NULL : header); - -cleanup: - brelse(bh); - if (!(bh && header == HDR(bh))) - kfree(header); - up_write(&EXT3_I(inode)->xattr_sem); - - return error; -} -/* - * Second half of ext3_xattr_set_handle(): Update the file system. - */ -static int -ext3_xattr_set_handle2(handle_t *handle, struct inode *inode, - struct buffer_head *old_bh, - struct ext3_xattr_header *header) -{ - struct super_block *sb = inode->i_sb; - struct buffer_head *new_bh = NULL; - struct mb_cache_entry *ce = NULL; - int error; + error = ext3_xattr_set_entry(&i, &s); + if (error == -EIO) + goto bad_block; + if (error) + goto cleanup; + if (!IS_LAST_ENTRY(s.first)) + ext3_xattr_rehash(header, s.here); - if (header) { +inserted: + if (!IS_LAST_ENTRY(s.first)) { new_bh = ext3_xattr_cache_find(inode, header, &ce); if (new_bh) { /* We found an identical block in the cache. */ if (new_bh == old_bh) - ea_bdebug(new_bh, "keeping this block"); + ea_bdebug(new_bh, "keeping"); else { /* The old block is released after updating the inode. */ - ea_bdebug(new_bh, "reusing block"); - error = -EDQUOT; if (DQUOT_ALLOC_BLOCK(inode, 1)) goto cleanup; @@ -701,25 +694,23 @@ ext3_xattr_set_handle2(handle_t *handle, struct inode *inode, if (error) goto cleanup; lock_buffer(new_bh); - HDR(new_bh)->h_refcount = cpu_to_le32(1 + - le32_to_cpu(HDR(new_bh)->h_refcount)); - ea_bdebug(new_bh, "refcount now=%d", - le32_to_cpu(HDR(new_bh)->h_refcount)); + BHDR(new_bh)->h_refcount = cpu_to_le32(1 + + le32_to_cpu(BHDR(new_bh)->h_refcount)); + ea_bdebug(new_bh, "reusing; refcount now=%d", + le32_to_cpu(BHDR(new_bh)->h_refcount)); unlock_buffer(new_bh); - error = ext3_journal_dirty_metadata(handle, new_bh); + error = ext3_journal_dirty_metadata(handle, + new_bh); if (error) goto cleanup; } mb_cache_entry_release(ce); ce = NULL; - } else if (old_bh && header == HDR(old_bh)) { + } else if (old_bh && header == BHDR(old_bh)) { /* We were modifying this block in-place. */ - - /* Keep this block. No need to lock the block as we - * don't need to change the reference count. */ + ea_bdebug(old_bh, "keeping this block"); new_bh = old_bh; get_bh(new_bh); - ext3_xattr_cache_insert(new_bh); } else { /* We need to allocate a new block */ int goal = le32_to_cpu( @@ -748,11 +739,10 @@ getblk_failed: set_buffer_uptodate(new_bh); unlock_buffer(new_bh); ext3_xattr_cache_insert(new_bh); - - ext3_xattr_update_super_block(handle, sb); error = ext3_journal_dirty_metadata(handle, new_bh); if (error) goto cleanup; + ext3_xattr_update_super_block(handle, sb); } } @@ -763,21 +753,23 @@ getblk_failed: if (IS_SYNC(inode)) handle->h_sync = 1; - error = 0; - if (old_bh && old_bh != new_bh) { - /* - * If there was an old block, and we are no longer using it, - * release the old block. - */ + /* Drop the previous xattr block. */ + if (old_bh && old_bh != new_bh) ext3_xattr_release_block(handle, inode, old_bh); - } + error = 0; cleanup: if (ce) mb_cache_entry_release(ce); brelse(new_bh); + brelse(old_bh); + if (!(old_bh && header == BHDR(old_bh))) + kfree(header); + up_write(&EXT3_I(inode)->xattr_sem); return error; + +#undef header } /* @@ -832,14 +824,14 @@ ext3_xattr_delete_inode(handle_t *handle, struct inode *inode) goto cleanup; bh = sb_bread(inode->i_sb, EXT3_I(inode)->i_file_acl); if (!bh) { - ext3_error(inode->i_sb, "ext3_xattr_delete_inode", + ext3_error(inode->i_sb, __FUNCTION__, "inode %ld: block %d read error", inode->i_ino, EXT3_I(inode)->i_file_acl); goto cleanup; } - if (HDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || - HDR(bh)->h_blocks != cpu_to_le32(1)) { - ext3_error(inode->i_sb, "ext3_xattr_delete_inode", + if (BHDR(bh)->h_magic != cpu_to_le32(EXT3_XATTR_MAGIC) || + BHDR(bh)->h_blocks != cpu_to_le32(1)) { + ext3_error(inode->i_sb, __FUNCTION__, "inode %ld: bad block %d", inode->i_ino, EXT3_I(inode)->i_file_acl); goto cleanup; @@ -871,30 +863,29 @@ ext3_xattr_put_super(struct super_block *sb) * * Returns 0, or a negative error number on failure. */ -static int +static void ext3_xattr_cache_insert(struct buffer_head *bh) { - __u32 hash = le32_to_cpu(HDR(bh)->h_hash); + __u32 hash = le32_to_cpu(BHDR(bh)->h_hash); struct mb_cache_entry *ce; int error; ce = mb_cache_entry_alloc(ext3_xattr_cache); - if (!ce) - return -ENOMEM; + if (!ce) { + ea_bdebug(bh, "out of memory"); + return; + } error = mb_cache_entry_insert(ce, bh->b_bdev, bh->b_blocknr, &hash); if (error) { mb_cache_entry_free(ce); if (error == -EBUSY) { - ea_bdebug(bh, "already in cache (%d cache entries)", - atomic_read(&ext3_xattr_cache->c_entry_count)); + ea_bdebug(bh, "already in cache"); error = 0; } } else { - ea_bdebug(bh, "inserting [%x] (%d cache entries)", (int)hash, - atomic_read(&ext3_xattr_cache->c_entry_count)); + ea_bdebug(bh, "inserting [%x]", (int)hash); mb_cache_entry_release(ce); } - return error; } /* @@ -967,16 +958,16 @@ again: } bh = sb_bread(inode->i_sb, ce->e_block); if (!bh) { - ext3_error(inode->i_sb, "ext3_xattr_cache_find", + ext3_error(inode->i_sb, __FUNCTION__, "inode %ld: block %ld read error", inode->i_ino, (unsigned long) ce->e_block); - } else if (le32_to_cpu(HDR(bh)->h_refcount) > + } else if (le32_to_cpu(BHDR(bh)->h_refcount) >= EXT3_XATTR_REFCOUNT_MAX) { - ea_idebug(inode, "block %ld refcount %d>%d", + ea_idebug(inode, "block %ld refcount %d>=%d", (unsigned long) ce->e_block, - le32_to_cpu(HDR(bh)->h_refcount), + le32_to_cpu(BHDR(bh)->h_refcount), EXT3_XATTR_REFCOUNT_MAX); - } else if (ext3_xattr_cmp(header, HDR(bh)) == 0) { + } else if (ext3_xattr_cmp(header, BHDR(bh)) == 0) { *pce = ce; return bh; } -- cgit 1.2.3-korg