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authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/fs/ext3/namei.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/fs/ext3/namei.c')
-rw-r--r--kernel/fs/ext3/namei.c2585
1 files changed, 0 insertions, 2585 deletions
diff --git a/kernel/fs/ext3/namei.c b/kernel/fs/ext3/namei.c
deleted file mode 100644
index 4264b9bd0..000000000
--- a/kernel/fs/ext3/namei.c
+++ /dev/null
@@ -1,2585 +0,0 @@
-/*
- * linux/fs/ext3/namei.c
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- *
- * from
- *
- * linux/fs/minix/namei.c
- *
- * Copyright (C) 1991, 1992 Linus Torvalds
- *
- * Big-endian to little-endian byte-swapping/bitmaps by
- * David S. Miller (davem@caip.rutgers.edu), 1995
- * Directory entry file type support and forward compatibility hooks
- * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
- * Hash Tree Directory indexing (c)
- * Daniel Phillips, 2001
- * Hash Tree Directory indexing porting
- * Christopher Li, 2002
- * Hash Tree Directory indexing cleanup
- * Theodore Ts'o, 2002
- */
-
-#include <linux/quotaops.h>
-#include "ext3.h"
-#include "namei.h"
-#include "xattr.h"
-#include "acl.h"
-
-/*
- * define how far ahead to read directories while searching them.
- */
-#define NAMEI_RA_CHUNKS 2
-#define NAMEI_RA_BLOCKS 4
-#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
-
-static struct buffer_head *ext3_append(handle_t *handle,
- struct inode *inode,
- u32 *block, int *err)
-{
- struct buffer_head *bh;
-
- *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
-
- if ((bh = ext3_dir_bread(handle, inode, *block, 1, err))) {
- inode->i_size += inode->i_sb->s_blocksize;
- EXT3_I(inode)->i_disksize = inode->i_size;
- *err = ext3_journal_get_write_access(handle, bh);
- if (*err) {
- brelse(bh);
- bh = NULL;
- }
- }
- return bh;
-}
-
-#ifndef assert
-#define assert(test) J_ASSERT(test)
-#endif
-
-#ifdef DX_DEBUG
-#define dxtrace(command) command
-#else
-#define dxtrace(command)
-#endif
-
-struct fake_dirent
-{
- __le32 inode;
- __le16 rec_len;
- u8 name_len;
- u8 file_type;
-};
-
-struct dx_countlimit
-{
- __le16 limit;
- __le16 count;
-};
-
-struct dx_entry
-{
- __le32 hash;
- __le32 block;
-};
-
-/*
- * dx_root_info is laid out so that if it should somehow get overlaid by a
- * dirent the two low bits of the hash version will be zero. Therefore, the
- * hash version mod 4 should never be 0. Sincerely, the paranoia department.
- */
-
-struct dx_root
-{
- struct fake_dirent dot;
- char dot_name[4];
- struct fake_dirent dotdot;
- char dotdot_name[4];
- struct dx_root_info
- {
- __le32 reserved_zero;
- u8 hash_version;
- u8 info_length; /* 8 */
- u8 indirect_levels;
- u8 unused_flags;
- }
- info;
- struct dx_entry entries[0];
-};
-
-struct dx_node
-{
- struct fake_dirent fake;
- struct dx_entry entries[0];
-};
-
-
-struct dx_frame
-{
- struct buffer_head *bh;
- struct dx_entry *entries;
- struct dx_entry *at;
-};
-
-struct dx_map_entry
-{
- u32 hash;
- u16 offs;
- u16 size;
-};
-
-static inline unsigned dx_get_block (struct dx_entry *entry);
-static void dx_set_block (struct dx_entry *entry, unsigned value);
-static inline unsigned dx_get_hash (struct dx_entry *entry);
-static void dx_set_hash (struct dx_entry *entry, unsigned value);
-static unsigned dx_get_count (struct dx_entry *entries);
-static unsigned dx_get_limit (struct dx_entry *entries);
-static void dx_set_count (struct dx_entry *entries, unsigned value);
-static void dx_set_limit (struct dx_entry *entries, unsigned value);
-static unsigned dx_root_limit (struct inode *dir, unsigned infosize);
-static unsigned dx_node_limit (struct inode *dir);
-static struct dx_frame *dx_probe(struct qstr *entry,
- struct inode *dir,
- struct dx_hash_info *hinfo,
- struct dx_frame *frame,
- int *err);
-static void dx_release (struct dx_frame *frames);
-static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize,
- struct dx_hash_info *hinfo, struct dx_map_entry map[]);
-static void dx_sort_map(struct dx_map_entry *map, unsigned count);
-static struct ext3_dir_entry_2 *dx_move_dirents (char *from, char *to,
- struct dx_map_entry *offsets, int count);
-static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize);
-static void dx_insert_block (struct dx_frame *frame, u32 hash, u32 block);
-static int ext3_htree_next_block(struct inode *dir, __u32 hash,
- struct dx_frame *frame,
- struct dx_frame *frames,
- __u32 *start_hash);
-static struct buffer_head * ext3_dx_find_entry(struct inode *dir,
- struct qstr *entry, struct ext3_dir_entry_2 **res_dir,
- int *err);
-static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
- struct inode *inode);
-
-/*
- * p is at least 6 bytes before the end of page
- */
-static inline struct ext3_dir_entry_2 *
-ext3_next_entry(struct ext3_dir_entry_2 *p)
-{
- return (struct ext3_dir_entry_2 *)((char *)p +
- ext3_rec_len_from_disk(p->rec_len));
-}
-
-/*
- * Future: use high four bits of block for coalesce-on-delete flags
- * Mask them off for now.
- */
-
-static inline unsigned dx_get_block (struct dx_entry *entry)
-{
- return le32_to_cpu(entry->block) & 0x00ffffff;
-}
-
-static inline void dx_set_block (struct dx_entry *entry, unsigned value)
-{
- entry->block = cpu_to_le32(value);
-}
-
-static inline unsigned dx_get_hash (struct dx_entry *entry)
-{
- return le32_to_cpu(entry->hash);
-}
-
-static inline void dx_set_hash (struct dx_entry *entry, unsigned value)
-{
- entry->hash = cpu_to_le32(value);
-}
-
-static inline unsigned dx_get_count (struct dx_entry *entries)
-{
- return le16_to_cpu(((struct dx_countlimit *) entries)->count);
-}
-
-static inline unsigned dx_get_limit (struct dx_entry *entries)
-{
- return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
-}
-
-static inline void dx_set_count (struct dx_entry *entries, unsigned value)
-{
- ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
-}
-
-static inline void dx_set_limit (struct dx_entry *entries, unsigned value)
-{
- ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
-}
-
-static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
-{
- unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(1) -
- EXT3_DIR_REC_LEN(2) - infosize;
- return entry_space / sizeof(struct dx_entry);
-}
-
-static inline unsigned dx_node_limit (struct inode *dir)
-{
- unsigned entry_space = dir->i_sb->s_blocksize - EXT3_DIR_REC_LEN(0);
- return entry_space / sizeof(struct dx_entry);
-}
-
-/*
- * Debug
- */
-#ifdef DX_DEBUG
-static void dx_show_index (char * label, struct dx_entry *entries)
-{
- int i, n = dx_get_count (entries);
- printk("%s index ", label);
- for (i = 0; i < n; i++)
- {
- printk("%x->%u ", i? dx_get_hash(entries + i): 0, dx_get_block(entries + i));
- }
- printk("\n");
-}
-
-struct stats
-{
- unsigned names;
- unsigned space;
- unsigned bcount;
-};
-
-static struct stats dx_show_leaf(struct dx_hash_info *hinfo, struct ext3_dir_entry_2 *de,
- int size, int show_names)
-{
- unsigned names = 0, space = 0;
- char *base = (char *) de;
- struct dx_hash_info h = *hinfo;
-
- printk("names: ");
- while ((char *) de < base + size)
- {
- if (de->inode)
- {
- if (show_names)
- {
- int len = de->name_len;
- char *name = de->name;
- while (len--) printk("%c", *name++);
- ext3fs_dirhash(de->name, de->name_len, &h);
- printk(":%x.%u ", h.hash,
- (unsigned) ((char *) de - base));
- }
- space += EXT3_DIR_REC_LEN(de->name_len);
- names++;
- }
- de = ext3_next_entry(de);
- }
- printk("(%i)\n", names);
- return (struct stats) { names, space, 1 };
-}
-
-struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
- struct dx_entry *entries, int levels)
-{
- unsigned blocksize = dir->i_sb->s_blocksize;
- unsigned count = dx_get_count (entries), names = 0, space = 0, i;
- unsigned bcount = 0;
- struct buffer_head *bh;
- int err;
- printk("%i indexed blocks...\n", count);
- for (i = 0; i < count; i++, entries++)
- {
- u32 block = dx_get_block(entries), hash = i? dx_get_hash(entries): 0;
- u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
- struct stats stats;
- printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
- if (!(bh = ext3_bread (NULL,dir, block, 0,&err))) continue;
- stats = levels?
- dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
- dx_show_leaf(hinfo, (struct ext3_dir_entry_2 *) bh->b_data, blocksize, 0);
- names += stats.names;
- space += stats.space;
- bcount += stats.bcount;
- brelse (bh);
- }
- if (bcount)
- printk("%snames %u, fullness %u (%u%%)\n", levels?"":" ",
- names, space/bcount,(space/bcount)*100/blocksize);
- return (struct stats) { names, space, bcount};
-}
-#endif /* DX_DEBUG */
-
-/*
- * Probe for a directory leaf block to search.
- *
- * dx_probe can return ERR_BAD_DX_DIR, which means there was a format
- * error in the directory index, and the caller should fall back to
- * searching the directory normally. The callers of dx_probe **MUST**
- * check for this error code, and make sure it never gets reflected
- * back to userspace.
- */
-static struct dx_frame *
-dx_probe(struct qstr *entry, struct inode *dir,
- struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
-{
- unsigned count, indirect;
- struct dx_entry *at, *entries, *p, *q, *m;
- struct dx_root *root;
- struct buffer_head *bh;
- struct dx_frame *frame = frame_in;
- u32 hash;
-
- frame->bh = NULL;
- if (!(bh = ext3_dir_bread(NULL, dir, 0, 0, err))) {
- *err = ERR_BAD_DX_DIR;
- goto fail;
- }
- root = (struct dx_root *) bh->b_data;
- if (root->info.hash_version != DX_HASH_TEA &&
- root->info.hash_version != DX_HASH_HALF_MD4 &&
- root->info.hash_version != DX_HASH_LEGACY) {
- ext3_warning(dir->i_sb, __func__,
- "Unrecognised inode hash code %d",
- root->info.hash_version);
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail;
- }
- hinfo->hash_version = root->info.hash_version;
- if (hinfo->hash_version <= DX_HASH_TEA)
- hinfo->hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned;
- hinfo->seed = EXT3_SB(dir->i_sb)->s_hash_seed;
- if (entry)
- ext3fs_dirhash(entry->name, entry->len, hinfo);
- hash = hinfo->hash;
-
- if (root->info.unused_flags & 1) {
- ext3_warning(dir->i_sb, __func__,
- "Unimplemented inode hash flags: %#06x",
- root->info.unused_flags);
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail;
- }
-
- if ((indirect = root->info.indirect_levels) > 1) {
- ext3_warning(dir->i_sb, __func__,
- "Unimplemented inode hash depth: %#06x",
- root->info.indirect_levels);
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail;
- }
-
- entries = (struct dx_entry *) (((char *)&root->info) +
- root->info.info_length);
-
- if (dx_get_limit(entries) != dx_root_limit(dir,
- root->info.info_length)) {
- ext3_warning(dir->i_sb, __func__,
- "dx entry: limit != root limit");
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail;
- }
-
- dxtrace (printk("Look up %x", hash));
- while (1)
- {
- count = dx_get_count(entries);
- if (!count || count > dx_get_limit(entries)) {
- ext3_warning(dir->i_sb, __func__,
- "dx entry: no count or count > limit");
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail2;
- }
-
- p = entries + 1;
- q = entries + count - 1;
- while (p <= q)
- {
- m = p + (q - p)/2;
- dxtrace(printk("."));
- if (dx_get_hash(m) > hash)
- q = m - 1;
- else
- p = m + 1;
- }
-
- if (0) // linear search cross check
- {
- unsigned n = count - 1;
- at = entries;
- while (n--)
- {
- dxtrace(printk(","));
- if (dx_get_hash(++at) > hash)
- {
- at--;
- break;
- }
- }
- assert (at == p - 1);
- }
-
- at = p - 1;
- dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
- frame->bh = bh;
- frame->entries = entries;
- frame->at = at;
- if (!indirect--) return frame;
- if (!(bh = ext3_dir_bread(NULL, dir, dx_get_block(at), 0, err))) {
- *err = ERR_BAD_DX_DIR;
- goto fail2;
- }
- at = entries = ((struct dx_node *) bh->b_data)->entries;
- if (dx_get_limit(entries) != dx_node_limit (dir)) {
- ext3_warning(dir->i_sb, __func__,
- "dx entry: limit != node limit");
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail2;
- }
- frame++;
- frame->bh = NULL;
- }
-fail2:
- while (frame >= frame_in) {
- brelse(frame->bh);
- frame--;
- }
-fail:
- if (*err == ERR_BAD_DX_DIR)
- ext3_warning(dir->i_sb, __func__,
- "Corrupt dir inode %ld, running e2fsck is "
- "recommended.", dir->i_ino);
- return NULL;
-}
-
-static void dx_release (struct dx_frame *frames)
-{
- if (frames[0].bh == NULL)
- return;
-
- if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels)
- brelse(frames[1].bh);
- brelse(frames[0].bh);
-}
-
-/*
- * This function increments the frame pointer to search the next leaf
- * block, and reads in the necessary intervening nodes if the search
- * should be necessary. Whether or not the search is necessary is
- * controlled by the hash parameter. If the hash value is even, then
- * the search is only continued if the next block starts with that
- * hash value. This is used if we are searching for a specific file.
- *
- * If the hash value is HASH_NB_ALWAYS, then always go to the next block.
- *
- * This function returns 1 if the caller should continue to search,
- * or 0 if it should not. If there is an error reading one of the
- * index blocks, it will a negative error code.
- *
- * If start_hash is non-null, it will be filled in with the starting
- * hash of the next page.
- */
-static int ext3_htree_next_block(struct inode *dir, __u32 hash,
- struct dx_frame *frame,
- struct dx_frame *frames,
- __u32 *start_hash)
-{
- struct dx_frame *p;
- struct buffer_head *bh;
- int err, num_frames = 0;
- __u32 bhash;
-
- p = frame;
- /*
- * Find the next leaf page by incrementing the frame pointer.
- * If we run out of entries in the interior node, loop around and
- * increment pointer in the parent node. When we break out of
- * this loop, num_frames indicates the number of interior
- * nodes need to be read.
- */
- while (1) {
- if (++(p->at) < p->entries + dx_get_count(p->entries))
- break;
- if (p == frames)
- return 0;
- num_frames++;
- p--;
- }
-
- /*
- * If the hash is 1, then continue only if the next page has a
- * continuation hash of any value. This is used for readdir
- * handling. Otherwise, check to see if the hash matches the
- * desired contiuation hash. If it doesn't, return since
- * there's no point to read in the successive index pages.
- */
- bhash = dx_get_hash(p->at);
- if (start_hash)
- *start_hash = bhash;
- if ((hash & 1) == 0) {
- if ((bhash & ~1) != hash)
- return 0;
- }
- /*
- * If the hash is HASH_NB_ALWAYS, we always go to the next
- * block so no check is necessary
- */
- while (num_frames--) {
- if (!(bh = ext3_dir_bread(NULL, dir, dx_get_block(p->at),
- 0, &err)))
- return err; /* Failure */
- p++;
- brelse (p->bh);
- p->bh = bh;
- p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
- }
- return 1;
-}
-
-
-/*
- * This function fills a red-black tree with information from a
- * directory block. It returns the number directory entries loaded
- * into the tree. If there is an error it is returned in err.
- */
-static int htree_dirblock_to_tree(struct file *dir_file,
- struct inode *dir, int block,
- struct dx_hash_info *hinfo,
- __u32 start_hash, __u32 start_minor_hash)
-{
- struct buffer_head *bh;
- struct ext3_dir_entry_2 *de, *top;
- int err = 0, count = 0;
-
- dxtrace(printk("In htree dirblock_to_tree: block %d\n", block));
-
- if (!(bh = ext3_dir_bread(NULL, dir, block, 0, &err)))
- return err;
-
- de = (struct ext3_dir_entry_2 *) bh->b_data;
- top = (struct ext3_dir_entry_2 *) ((char *) de +
- dir->i_sb->s_blocksize -
- EXT3_DIR_REC_LEN(0));
- for (; de < top; de = ext3_next_entry(de)) {
- if (!ext3_check_dir_entry("htree_dirblock_to_tree", dir, de, bh,
- (block<<EXT3_BLOCK_SIZE_BITS(dir->i_sb))
- +((char *)de - bh->b_data))) {
- /* silently ignore the rest of the block */
- break;
- }
- ext3fs_dirhash(de->name, de->name_len, hinfo);
- if ((hinfo->hash < start_hash) ||
- ((hinfo->hash == start_hash) &&
- (hinfo->minor_hash < start_minor_hash)))
- continue;
- if (de->inode == 0)
- continue;
- if ((err = ext3_htree_store_dirent(dir_file,
- hinfo->hash, hinfo->minor_hash, de)) != 0) {
- brelse(bh);
- return err;
- }
- count++;
- }
- brelse(bh);
- return count;
-}
-
-
-/*
- * This function fills a red-black tree with information from a
- * directory. We start scanning the directory in hash order, starting
- * at start_hash and start_minor_hash.
- *
- * This function returns the number of entries inserted into the tree,
- * or a negative error code.
- */
-int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
- __u32 start_minor_hash, __u32 *next_hash)
-{
- struct dx_hash_info hinfo;
- struct ext3_dir_entry_2 *de;
- struct dx_frame frames[2], *frame;
- struct inode *dir;
- int block, err;
- int count = 0;
- int ret;
- __u32 hashval;
-
- dxtrace(printk("In htree_fill_tree, start hash: %x:%x\n", start_hash,
- start_minor_hash));
- dir = file_inode(dir_file);
- if (!(EXT3_I(dir)->i_flags & EXT3_INDEX_FL)) {
- hinfo.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
- if (hinfo.hash_version <= DX_HASH_TEA)
- hinfo.hash_version +=
- EXT3_SB(dir->i_sb)->s_hash_unsigned;
- hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
- count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
- start_hash, start_minor_hash);
- *next_hash = ~0;
- return count;
- }
- hinfo.hash = start_hash;
- hinfo.minor_hash = 0;
- frame = dx_probe(NULL, file_inode(dir_file), &hinfo, frames, &err);
- if (!frame)
- return err;
-
- /* Add '.' and '..' from the htree header */
- if (!start_hash && !start_minor_hash) {
- de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
- if ((err = ext3_htree_store_dirent(dir_file, 0, 0, de)) != 0)
- goto errout;
- count++;
- }
- if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
- de = (struct ext3_dir_entry_2 *) frames[0].bh->b_data;
- de = ext3_next_entry(de);
- if ((err = ext3_htree_store_dirent(dir_file, 2, 0, de)) != 0)
- goto errout;
- count++;
- }
-
- while (1) {
- block = dx_get_block(frame->at);
- ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
- start_hash, start_minor_hash);
- if (ret < 0) {
- err = ret;
- goto errout;
- }
- count += ret;
- hashval = ~0;
- ret = ext3_htree_next_block(dir, HASH_NB_ALWAYS,
- frame, frames, &hashval);
- *next_hash = hashval;
- if (ret < 0) {
- err = ret;
- goto errout;
- }
- /*
- * Stop if: (a) there are no more entries, or
- * (b) we have inserted at least one entry and the
- * next hash value is not a continuation
- */
- if ((ret == 0) ||
- (count && ((hashval & 1) == 0)))
- break;
- }
- dx_release(frames);
- dxtrace(printk("Fill tree: returned %d entries, next hash: %x\n",
- count, *next_hash));
- return count;
-errout:
- dx_release(frames);
- return (err);
-}
-
-
-/*
- * Directory block splitting, compacting
- */
-
-/*
- * Create map of hash values, offsets, and sizes, stored at end of block.
- * Returns number of entries mapped.
- */
-static int dx_make_map(struct ext3_dir_entry_2 *de, unsigned blocksize,
- struct dx_hash_info *hinfo, struct dx_map_entry *map_tail)
-{
- int count = 0;
- char *base = (char *) de;
- struct dx_hash_info h = *hinfo;
-
- while ((char *) de < base + blocksize)
- {
- if (de->name_len && de->inode) {
- ext3fs_dirhash(de->name, de->name_len, &h);
- map_tail--;
- map_tail->hash = h.hash;
- map_tail->offs = (u16) ((char *) de - base);
- map_tail->size = le16_to_cpu(de->rec_len);
- count++;
- cond_resched();
- }
- /* XXX: do we need to check rec_len == 0 case? -Chris */
- de = ext3_next_entry(de);
- }
- return count;
-}
-
-/* Sort map by hash value */
-static void dx_sort_map (struct dx_map_entry *map, unsigned count)
-{
- struct dx_map_entry *p, *q, *top = map + count - 1;
- int more;
- /* Combsort until bubble sort doesn't suck */
- while (count > 2)
- {
- count = count*10/13;
- if (count - 9 < 2) /* 9, 10 -> 11 */
- count = 11;
- for (p = top, q = p - count; q >= map; p--, q--)
- if (p->hash < q->hash)
- swap(*p, *q);
- }
- /* Garden variety bubble sort */
- do {
- more = 0;
- q = top;
- while (q-- > map)
- {
- if (q[1].hash >= q[0].hash)
- continue;
- swap(*(q+1), *q);
- more = 1;
- }
- } while(more);
-}
-
-static void dx_insert_block(struct dx_frame *frame, u32 hash, u32 block)
-{
- struct dx_entry *entries = frame->entries;
- struct dx_entry *old = frame->at, *new = old + 1;
- int count = dx_get_count(entries);
-
- assert(count < dx_get_limit(entries));
- assert(old < entries + count);
- memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
- dx_set_hash(new, hash);
- dx_set_block(new, block);
- dx_set_count(entries, count + 1);
-}
-
-static void ext3_update_dx_flag(struct inode *inode)
-{
- if (!EXT3_HAS_COMPAT_FEATURE(inode->i_sb,
- EXT3_FEATURE_COMPAT_DIR_INDEX))
- EXT3_I(inode)->i_flags &= ~EXT3_INDEX_FL;
-}
-
-/*
- * NOTE! unlike strncmp, ext3_match returns 1 for success, 0 for failure.
- *
- * `len <= EXT3_NAME_LEN' is guaranteed by caller.
- * `de != NULL' is guaranteed by caller.
- */
-static inline int ext3_match (int len, const char * const name,
- struct ext3_dir_entry_2 * de)
-{
- if (len != de->name_len)
- return 0;
- if (!de->inode)
- return 0;
- return !memcmp(name, de->name, len);
-}
-
-/*
- * Returns 0 if not found, -1 on failure, and 1 on success
- */
-static inline int search_dirblock(struct buffer_head * bh,
- struct inode *dir,
- struct qstr *child,
- unsigned long offset,
- struct ext3_dir_entry_2 ** res_dir)
-{
- struct ext3_dir_entry_2 * de;
- char * dlimit;
- int de_len;
- const char *name = child->name;
- int namelen = child->len;
-
- de = (struct ext3_dir_entry_2 *) bh->b_data;
- dlimit = bh->b_data + dir->i_sb->s_blocksize;
- while ((char *) de < dlimit) {
- /* this code is executed quadratically often */
- /* do minimal checking `by hand' */
-
- if ((char *) de + namelen <= dlimit &&
- ext3_match (namelen, name, de)) {
- /* found a match - just to be sure, do a full check */
- if (!ext3_check_dir_entry("ext3_find_entry",
- dir, de, bh, offset))
- return -1;
- *res_dir = de;
- return 1;
- }
- /* prevent looping on a bad block */
- de_len = ext3_rec_len_from_disk(de->rec_len);
- if (de_len <= 0)
- return -1;
- offset += de_len;
- de = (struct ext3_dir_entry_2 *) ((char *) de + de_len);
- }
- return 0;
-}
-
-
-/*
- * ext3_find_entry()
- *
- * finds an entry in the specified directory with the wanted name. It
- * returns the cache buffer in which the entry was found, and the entry
- * itself (as a parameter - res_dir). It does NOT read the inode of the
- * entry - you'll have to do that yourself if you want to.
- *
- * The returned buffer_head has ->b_count elevated. The caller is expected
- * to brelse() it when appropriate.
- */
-static struct buffer_head *ext3_find_entry(struct inode *dir,
- struct qstr *entry,
- struct ext3_dir_entry_2 **res_dir)
-{
- struct super_block * sb;
- struct buffer_head * bh_use[NAMEI_RA_SIZE];
- struct buffer_head * bh, *ret = NULL;
- unsigned long start, block, b;
- const u8 *name = entry->name;
- int ra_max = 0; /* Number of bh's in the readahead
- buffer, bh_use[] */
- int ra_ptr = 0; /* Current index into readahead
- buffer */
- int num = 0;
- int nblocks, i, err;
- int namelen;
-
- *res_dir = NULL;
- sb = dir->i_sb;
- namelen = entry->len;
- if (namelen > EXT3_NAME_LEN)
- return NULL;
- if ((namelen <= 2) && (name[0] == '.') &&
- (name[1] == '.' || name[1] == 0)) {
- /*
- * "." or ".." will only be in the first block
- * NFS may look up ".."; "." should be handled by the VFS
- */
- block = start = 0;
- nblocks = 1;
- goto restart;
- }
- if (is_dx(dir)) {
- bh = ext3_dx_find_entry(dir, entry, res_dir, &err);
- /*
- * On success, or if the error was file not found,
- * return. Otherwise, fall back to doing a search the
- * old fashioned way.
- */
- if (bh || (err != ERR_BAD_DX_DIR))
- return bh;
- dxtrace(printk("ext3_find_entry: dx failed, falling back\n"));
- }
- nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
- start = EXT3_I(dir)->i_dir_start_lookup;
- if (start >= nblocks)
- start = 0;
- block = start;
-restart:
- do {
- /*
- * We deal with the read-ahead logic here.
- */
- if (ra_ptr >= ra_max) {
- /* Refill the readahead buffer */
- ra_ptr = 0;
- b = block;
- for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
- /*
- * Terminate if we reach the end of the
- * directory and must wrap, or if our
- * search has finished at this block.
- */
- if (b >= nblocks || (num && block == start)) {
- bh_use[ra_max] = NULL;
- break;
- }
- num++;
- bh = ext3_getblk(NULL, dir, b++, 0, &err);
- bh_use[ra_max] = bh;
- if (bh && !bh_uptodate_or_lock(bh)) {
- get_bh(bh);
- bh->b_end_io = end_buffer_read_sync;
- submit_bh(READ | REQ_META | REQ_PRIO,
- bh);
- }
- }
- }
- if ((bh = bh_use[ra_ptr++]) == NULL)
- goto next;
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- /* read error, skip block & hope for the best */
- ext3_error(sb, __func__, "reading directory #%lu "
- "offset %lu", dir->i_ino, block);
- brelse(bh);
- goto next;
- }
- i = search_dirblock(bh, dir, entry,
- block << EXT3_BLOCK_SIZE_BITS(sb), res_dir);
- if (i == 1) {
- EXT3_I(dir)->i_dir_start_lookup = block;
- ret = bh;
- goto cleanup_and_exit;
- } else {
- brelse(bh);
- if (i < 0)
- goto cleanup_and_exit;
- }
- next:
- if (++block >= nblocks)
- block = 0;
- } while (block != start);
-
- /*
- * If the directory has grown while we were searching, then
- * search the last part of the directory before giving up.
- */
- block = nblocks;
- nblocks = dir->i_size >> EXT3_BLOCK_SIZE_BITS(sb);
- if (block < nblocks) {
- start = 0;
- goto restart;
- }
-
-cleanup_and_exit:
- /* Clean up the read-ahead blocks */
- for (; ra_ptr < ra_max; ra_ptr++)
- brelse (bh_use[ra_ptr]);
- return ret;
-}
-
-static struct buffer_head * ext3_dx_find_entry(struct inode *dir,
- struct qstr *entry, struct ext3_dir_entry_2 **res_dir,
- int *err)
-{
- struct super_block *sb = dir->i_sb;
- struct dx_hash_info hinfo;
- struct dx_frame frames[2], *frame;
- struct buffer_head *bh;
- unsigned long block;
- int retval;
-
- if (!(frame = dx_probe(entry, dir, &hinfo, frames, err)))
- return NULL;
- do {
- block = dx_get_block(frame->at);
- if (!(bh = ext3_dir_bread (NULL, dir, block, 0, err)))
- goto errout;
-
- retval = search_dirblock(bh, dir, entry,
- block << EXT3_BLOCK_SIZE_BITS(sb),
- res_dir);
- if (retval == 1) {
- dx_release(frames);
- return bh;
- }
- brelse(bh);
- if (retval == -1) {
- *err = ERR_BAD_DX_DIR;
- goto errout;
- }
-
- /* Check to see if we should continue to search */
- retval = ext3_htree_next_block(dir, hinfo.hash, frame,
- frames, NULL);
- if (retval < 0) {
- ext3_warning(sb, __func__,
- "error reading index page in directory #%lu",
- dir->i_ino);
- *err = retval;
- goto errout;
- }
- } while (retval == 1);
-
- *err = -ENOENT;
-errout:
- dxtrace(printk("%s not found\n", entry->name));
- dx_release (frames);
- return NULL;
-}
-
-static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
-{
- struct inode * inode;
- struct ext3_dir_entry_2 * de;
- struct buffer_head * bh;
-
- if (dentry->d_name.len > EXT3_NAME_LEN)
- return ERR_PTR(-ENAMETOOLONG);
-
- bh = ext3_find_entry(dir, &dentry->d_name, &de);
- inode = NULL;
- if (bh) {
- unsigned long ino = le32_to_cpu(de->inode);
- brelse (bh);
- if (!ext3_valid_inum(dir->i_sb, ino)) {
- ext3_error(dir->i_sb, "ext3_lookup",
- "bad inode number: %lu", ino);
- return ERR_PTR(-EIO);
- }
- inode = ext3_iget(dir->i_sb, ino);
- if (inode == ERR_PTR(-ESTALE)) {
- ext3_error(dir->i_sb, __func__,
- "deleted inode referenced: %lu",
- ino);
- return ERR_PTR(-EIO);
- }
- }
- return d_splice_alias(inode, dentry);
-}
-
-
-struct dentry *ext3_get_parent(struct dentry *child)
-{
- unsigned long ino;
- struct qstr dotdot = QSTR_INIT("..", 2);
- struct ext3_dir_entry_2 * de;
- struct buffer_head *bh;
-
- bh = ext3_find_entry(d_inode(child), &dotdot, &de);
- if (!bh)
- return ERR_PTR(-ENOENT);
- ino = le32_to_cpu(de->inode);
- brelse(bh);
-
- if (!ext3_valid_inum(d_inode(child)->i_sb, ino)) {
- ext3_error(d_inode(child)->i_sb, "ext3_get_parent",
- "bad inode number: %lu", ino);
- return ERR_PTR(-EIO);
- }
-
- return d_obtain_alias(ext3_iget(d_inode(child)->i_sb, ino));
-}
-
-#define S_SHIFT 12
-static unsigned char ext3_type_by_mode[S_IFMT >> S_SHIFT] = {
- [S_IFREG >> S_SHIFT] = EXT3_FT_REG_FILE,
- [S_IFDIR >> S_SHIFT] = EXT3_FT_DIR,
- [S_IFCHR >> S_SHIFT] = EXT3_FT_CHRDEV,
- [S_IFBLK >> S_SHIFT] = EXT3_FT_BLKDEV,
- [S_IFIFO >> S_SHIFT] = EXT3_FT_FIFO,
- [S_IFSOCK >> S_SHIFT] = EXT3_FT_SOCK,
- [S_IFLNK >> S_SHIFT] = EXT3_FT_SYMLINK,
-};
-
-static inline void ext3_set_de_type(struct super_block *sb,
- struct ext3_dir_entry_2 *de,
- umode_t mode) {
- if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_FILETYPE))
- de->file_type = ext3_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
-}
-
-/*
- * Move count entries from end of map between two memory locations.
- * Returns pointer to last entry moved.
- */
-static struct ext3_dir_entry_2 *
-dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count)
-{
- unsigned rec_len = 0;
-
- while (count--) {
- struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *) (from + map->offs);
- rec_len = EXT3_DIR_REC_LEN(de->name_len);
- memcpy (to, de, rec_len);
- ((struct ext3_dir_entry_2 *) to)->rec_len =
- ext3_rec_len_to_disk(rec_len);
- de->inode = 0;
- map++;
- to += rec_len;
- }
- return (struct ext3_dir_entry_2 *) (to - rec_len);
-}
-
-/*
- * Compact each dir entry in the range to the minimal rec_len.
- * Returns pointer to last entry in range.
- */
-static struct ext3_dir_entry_2 *dx_pack_dirents(char *base, unsigned blocksize)
-{
- struct ext3_dir_entry_2 *next, *to, *prev;
- struct ext3_dir_entry_2 *de = (struct ext3_dir_entry_2 *)base;
- unsigned rec_len = 0;
-
- prev = to = de;
- while ((char *)de < base + blocksize) {
- next = ext3_next_entry(de);
- if (de->inode && de->name_len) {
- rec_len = EXT3_DIR_REC_LEN(de->name_len);
- if (de > to)
- memmove(to, de, rec_len);
- to->rec_len = ext3_rec_len_to_disk(rec_len);
- prev = to;
- to = (struct ext3_dir_entry_2 *) (((char *) to) + rec_len);
- }
- de = next;
- }
- return prev;
-}
-
-/*
- * Split a full leaf block to make room for a new dir entry.
- * Allocate a new block, and move entries so that they are approx. equally full.
- * Returns pointer to de in block into which the new entry will be inserted.
- */
-static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
- struct buffer_head **bh,struct dx_frame *frame,
- struct dx_hash_info *hinfo, int *error)
-{
- unsigned blocksize = dir->i_sb->s_blocksize;
- unsigned count, continued;
- struct buffer_head *bh2;
- u32 newblock;
- u32 hash2;
- struct dx_map_entry *map;
- char *data1 = (*bh)->b_data, *data2;
- unsigned split, move, size;
- struct ext3_dir_entry_2 *de = NULL, *de2;
- int err = 0, i;
-
- bh2 = ext3_append (handle, dir, &newblock, &err);
- if (!(bh2)) {
- brelse(*bh);
- *bh = NULL;
- goto errout;
- }
-
- BUFFER_TRACE(*bh, "get_write_access");
- err = ext3_journal_get_write_access(handle, *bh);
- if (err)
- goto journal_error;
-
- BUFFER_TRACE(frame->bh, "get_write_access");
- err = ext3_journal_get_write_access(handle, frame->bh);
- if (err)
- goto journal_error;
-
- data2 = bh2->b_data;
-
- /* create map in the end of data2 block */
- map = (struct dx_map_entry *) (data2 + blocksize);
- count = dx_make_map ((struct ext3_dir_entry_2 *) data1,
- blocksize, hinfo, map);
- map -= count;
- dx_sort_map (map, count);
- /* Split the existing block in the middle, size-wise */
- size = 0;
- move = 0;
- for (i = count-1; i >= 0; i--) {
- /* is more than half of this entry in 2nd half of the block? */
- if (size + map[i].size/2 > blocksize/2)
- break;
- size += map[i].size;
- move++;
- }
- /* map index at which we will split */
- split = count - move;
- hash2 = map[split].hash;
- continued = hash2 == map[split - 1].hash;
- dxtrace(printk("Split block %i at %x, %i/%i\n",
- dx_get_block(frame->at), hash2, split, count-split));
-
- /* Fancy dance to stay within two buffers */
- de2 = dx_move_dirents(data1, data2, map + split, count - split);
- de = dx_pack_dirents(data1,blocksize);
- de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
- de2->rec_len = ext3_rec_len_to_disk(data2 + blocksize - (char *) de2);
- dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data1, blocksize, 1));
- dxtrace(dx_show_leaf (hinfo, (struct ext3_dir_entry_2 *) data2, blocksize, 1));
-
- /* Which block gets the new entry? */
- if (hinfo->hash >= hash2)
- {
- swap(*bh, bh2);
- de = de2;
- }
- dx_insert_block (frame, hash2 + continued, newblock);
- err = ext3_journal_dirty_metadata (handle, bh2);
- if (err)
- goto journal_error;
- err = ext3_journal_dirty_metadata (handle, frame->bh);
- if (err)
- goto journal_error;
- brelse (bh2);
- dxtrace(dx_show_index ("frame", frame->entries));
- return de;
-
-journal_error:
- brelse(*bh);
- brelse(bh2);
- *bh = NULL;
- ext3_std_error(dir->i_sb, err);
-errout:
- *error = err;
- return NULL;
-}
-
-
-/*
- * Add a new entry into a directory (leaf) block. If de is non-NULL,
- * it points to a directory entry which is guaranteed to be large
- * enough for new directory entry. If de is NULL, then
- * add_dirent_to_buf will attempt search the directory block for
- * space. It will return -ENOSPC if no space is available, and -EIO
- * and -EEXIST if directory entry already exists.
- *
- * NOTE! bh is NOT released in the case where ENOSPC is returned. In
- * all other cases bh is released.
- */
-static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
- struct inode *inode, struct ext3_dir_entry_2 *de,
- struct buffer_head * bh)
-{
- struct inode *dir = d_inode(dentry->d_parent);
- const char *name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- unsigned long offset = 0;
- unsigned short reclen;
- int nlen, rlen, err;
- char *top;
-
- reclen = EXT3_DIR_REC_LEN(namelen);
- if (!de) {
- de = (struct ext3_dir_entry_2 *)bh->b_data;
- top = bh->b_data + dir->i_sb->s_blocksize - reclen;
- while ((char *) de <= top) {
- if (!ext3_check_dir_entry("ext3_add_entry", dir, de,
- bh, offset)) {
- brelse (bh);
- return -EIO;
- }
- if (ext3_match (namelen, name, de)) {
- brelse (bh);
- return -EEXIST;
- }
- nlen = EXT3_DIR_REC_LEN(de->name_len);
- rlen = ext3_rec_len_from_disk(de->rec_len);
- if ((de->inode? rlen - nlen: rlen) >= reclen)
- break;
- de = (struct ext3_dir_entry_2 *)((char *)de + rlen);
- offset += rlen;
- }
- if ((char *) de > top)
- return -ENOSPC;
- }
- BUFFER_TRACE(bh, "get_write_access");
- err = ext3_journal_get_write_access(handle, bh);
- if (err) {
- ext3_std_error(dir->i_sb, err);
- brelse(bh);
- return err;
- }
-
- /* By now the buffer is marked for journaling */
- nlen = EXT3_DIR_REC_LEN(de->name_len);
- rlen = ext3_rec_len_from_disk(de->rec_len);
- if (de->inode) {
- struct ext3_dir_entry_2 *de1 = (struct ext3_dir_entry_2 *)((char *)de + nlen);
- de1->rec_len = ext3_rec_len_to_disk(rlen - nlen);
- de->rec_len = ext3_rec_len_to_disk(nlen);
- de = de1;
- }
- de->file_type = EXT3_FT_UNKNOWN;
- if (inode) {
- de->inode = cpu_to_le32(inode->i_ino);
- ext3_set_de_type(dir->i_sb, de, inode->i_mode);
- } else
- de->inode = 0;
- de->name_len = namelen;
- memcpy (de->name, name, namelen);
- /*
- * XXX shouldn't update any times until successful
- * completion of syscall, but too many callers depend
- * on this.
- *
- * XXX similarly, too many callers depend on
- * ext3_new_inode() setting the times, but error
- * recovery deletes the inode, so the worst that can
- * happen is that the times are slightly out of date
- * and/or different from the directory change time.
- */
- dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
- ext3_update_dx_flag(dir);
- dir->i_version++;
- ext3_mark_inode_dirty(handle, dir);
- BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
- err = ext3_journal_dirty_metadata(handle, bh);
- if (err)
- ext3_std_error(dir->i_sb, err);
- brelse(bh);
- return 0;
-}
-
-/*
- * This converts a one block unindexed directory to a 3 block indexed
- * directory, and adds the dentry to the indexed directory.
- */
-static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
- struct inode *inode, struct buffer_head *bh)
-{
- struct inode *dir = d_inode(dentry->d_parent);
- const char *name = dentry->d_name.name;
- int namelen = dentry->d_name.len;
- struct buffer_head *bh2;
- struct dx_root *root;
- struct dx_frame frames[2], *frame;
- struct dx_entry *entries;
- struct ext3_dir_entry_2 *de, *de2;
- char *data1, *top;
- unsigned len;
- int retval;
- unsigned blocksize;
- struct dx_hash_info hinfo;
- u32 block;
- struct fake_dirent *fde;
-
- blocksize = dir->i_sb->s_blocksize;
- dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
- retval = ext3_journal_get_write_access(handle, bh);
- if (retval) {
- ext3_std_error(dir->i_sb, retval);
- brelse(bh);
- return retval;
- }
- root = (struct dx_root *) bh->b_data;
-
- /* The 0th block becomes the root, move the dirents out */
- fde = &root->dotdot;
- de = (struct ext3_dir_entry_2 *)((char *)fde +
- ext3_rec_len_from_disk(fde->rec_len));
- if ((char *) de >= (((char *) root) + blocksize)) {
- ext3_error(dir->i_sb, __func__,
- "invalid rec_len for '..' in inode %lu",
- dir->i_ino);
- brelse(bh);
- return -EIO;
- }
- len = ((char *) root) + blocksize - (char *) de;
-
- bh2 = ext3_append (handle, dir, &block, &retval);
- if (!(bh2)) {
- brelse(bh);
- return retval;
- }
- EXT3_I(dir)->i_flags |= EXT3_INDEX_FL;
- data1 = bh2->b_data;
-
- memcpy (data1, de, len);
- de = (struct ext3_dir_entry_2 *) data1;
- top = data1 + len;
- while ((char *)(de2 = ext3_next_entry(de)) < top)
- de = de2;
- de->rec_len = ext3_rec_len_to_disk(data1 + blocksize - (char *) de);
- /* Initialize the root; the dot dirents already exist */
- de = (struct ext3_dir_entry_2 *) (&root->dotdot);
- de->rec_len = ext3_rec_len_to_disk(blocksize - EXT3_DIR_REC_LEN(2));
- memset (&root->info, 0, sizeof(root->info));
- root->info.info_length = sizeof(root->info);
- root->info.hash_version = EXT3_SB(dir->i_sb)->s_def_hash_version;
- entries = root->entries;
- dx_set_block (entries, 1);
- dx_set_count (entries, 1);
- dx_set_limit (entries, dx_root_limit(dir, sizeof(root->info)));
-
- /* Initialize as for dx_probe */
- hinfo.hash_version = root->info.hash_version;
- if (hinfo.hash_version <= DX_HASH_TEA)
- hinfo.hash_version += EXT3_SB(dir->i_sb)->s_hash_unsigned;
- hinfo.seed = EXT3_SB(dir->i_sb)->s_hash_seed;
- ext3fs_dirhash(name, namelen, &hinfo);
- frame = frames;
- frame->entries = entries;
- frame->at = entries;
- frame->bh = bh;
- bh = bh2;
- /*
- * Mark buffers dirty here so that if do_split() fails we write a
- * consistent set of buffers to disk.
- */
- ext3_journal_dirty_metadata(handle, frame->bh);
- ext3_journal_dirty_metadata(handle, bh);
- de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
- if (!de) {
- ext3_mark_inode_dirty(handle, dir);
- dx_release(frames);
- return retval;
- }
- dx_release(frames);
-
- return add_dirent_to_buf(handle, dentry, inode, de, bh);
-}
-
-/*
- * ext3_add_entry()
- *
- * adds a file entry to the specified directory, using the same
- * semantics as ext3_find_entry(). It returns NULL if it failed.
- *
- * NOTE!! The inode part of 'de' is left at 0 - which means you
- * may not sleep between calling this and putting something into
- * the entry, as someone else might have used it while you slept.
- */
-static int ext3_add_entry (handle_t *handle, struct dentry *dentry,
- struct inode *inode)
-{
- struct inode *dir = d_inode(dentry->d_parent);
- struct buffer_head * bh;
- struct ext3_dir_entry_2 *de;
- struct super_block * sb;
- int retval;
- int dx_fallback=0;
- unsigned blocksize;
- u32 block, blocks;
-
- sb = dir->i_sb;
- blocksize = sb->s_blocksize;
- if (!dentry->d_name.len)
- return -EINVAL;
- if (is_dx(dir)) {
- retval = ext3_dx_add_entry(handle, dentry, inode);
- if (!retval || (retval != ERR_BAD_DX_DIR))
- return retval;
- EXT3_I(dir)->i_flags &= ~EXT3_INDEX_FL;
- dx_fallback++;
- ext3_mark_inode_dirty(handle, dir);
- }
- blocks = dir->i_size >> sb->s_blocksize_bits;
- for (block = 0; block < blocks; block++) {
- if (!(bh = ext3_dir_bread(handle, dir, block, 0, &retval)))
- return retval;
-
- retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
- if (retval != -ENOSPC)
- return retval;
-
- if (blocks == 1 && !dx_fallback &&
- EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_DIR_INDEX))
- return make_indexed_dir(handle, dentry, inode, bh);
- brelse(bh);
- }
- bh = ext3_append(handle, dir, &block, &retval);
- if (!bh)
- return retval;
- de = (struct ext3_dir_entry_2 *) bh->b_data;
- de->inode = 0;
- de->rec_len = ext3_rec_len_to_disk(blocksize);
- return add_dirent_to_buf(handle, dentry, inode, de, bh);
-}
-
-/*
- * Returns 0 for success, or a negative error value
- */
-static int ext3_dx_add_entry(handle_t *handle, struct dentry *dentry,
- struct inode *inode)
-{
- struct dx_frame frames[2], *frame;
- struct dx_entry *entries, *at;
- struct dx_hash_info hinfo;
- struct buffer_head * bh;
- struct inode *dir = d_inode(dentry->d_parent);
- struct super_block * sb = dir->i_sb;
- struct ext3_dir_entry_2 *de;
- int err;
-
- frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err);
- if (!frame)
- return err;
- entries = frame->entries;
- at = frame->at;
-
- if (!(bh = ext3_dir_bread(handle, dir, dx_get_block(frame->at), 0, &err)))
- goto cleanup;
-
- BUFFER_TRACE(bh, "get_write_access");
- err = ext3_journal_get_write_access(handle, bh);
- if (err)
- goto journal_error;
-
- err = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
- if (err != -ENOSPC) {
- bh = NULL;
- goto cleanup;
- }
-
- /* Block full, should compress but for now just split */
- dxtrace(printk("using %u of %u node entries\n",
- dx_get_count(entries), dx_get_limit(entries)));
- /* Need to split index? */
- if (dx_get_count(entries) == dx_get_limit(entries)) {
- u32 newblock;
- unsigned icount = dx_get_count(entries);
- int levels = frame - frames;
- struct dx_entry *entries2;
- struct dx_node *node2;
- struct buffer_head *bh2;
-
- if (levels && (dx_get_count(frames->entries) ==
- dx_get_limit(frames->entries))) {
- ext3_warning(sb, __func__,
- "Directory index full!");
- err = -ENOSPC;
- goto cleanup;
- }
- bh2 = ext3_append (handle, dir, &newblock, &err);
- if (!(bh2))
- goto cleanup;
- node2 = (struct dx_node *)(bh2->b_data);
- entries2 = node2->entries;
- memset(&node2->fake, 0, sizeof(struct fake_dirent));
- node2->fake.rec_len = ext3_rec_len_to_disk(sb->s_blocksize);
- BUFFER_TRACE(frame->bh, "get_write_access");
- err = ext3_journal_get_write_access(handle, frame->bh);
- if (err)
- goto journal_error;
- if (levels) {
- unsigned icount1 = icount/2, icount2 = icount - icount1;
- unsigned hash2 = dx_get_hash(entries + icount1);
- dxtrace(printk("Split index %i/%i\n", icount1, icount2));
-
- BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
- err = ext3_journal_get_write_access(handle,
- frames[0].bh);
- if (err)
- goto journal_error;
-
- memcpy ((char *) entries2, (char *) (entries + icount1),
- icount2 * sizeof(struct dx_entry));
- dx_set_count (entries, icount1);
- dx_set_count (entries2, icount2);
- dx_set_limit (entries2, dx_node_limit(dir));
-
- /* Which index block gets the new entry? */
- if (at - entries >= icount1) {
- frame->at = at = at - entries - icount1 + entries2;
- frame->entries = entries = entries2;
- swap(frame->bh, bh2);
- }
- dx_insert_block (frames + 0, hash2, newblock);
- dxtrace(dx_show_index ("node", frames[1].entries));
- dxtrace(dx_show_index ("node",
- ((struct dx_node *) bh2->b_data)->entries));
- err = ext3_journal_dirty_metadata(handle, bh2);
- if (err)
- goto journal_error;
- brelse (bh2);
- } else {
- dxtrace(printk("Creating second level index...\n"));
- memcpy((char *) entries2, (char *) entries,
- icount * sizeof(struct dx_entry));
- dx_set_limit(entries2, dx_node_limit(dir));
-
- /* Set up root */
- dx_set_count(entries, 1);
- dx_set_block(entries + 0, newblock);
- ((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels = 1;
-
- /* Add new access path frame */
- frame = frames + 1;
- frame->at = at = at - entries + entries2;
- frame->entries = entries = entries2;
- frame->bh = bh2;
- err = ext3_journal_get_write_access(handle,
- frame->bh);
- if (err)
- goto journal_error;
- }
- err = ext3_journal_dirty_metadata(handle, frames[0].bh);
- if (err)
- goto journal_error;
- }
- de = do_split(handle, dir, &bh, frame, &hinfo, &err);
- if (!de)
- goto cleanup;
- err = add_dirent_to_buf(handle, dentry, inode, de, bh);
- bh = NULL;
- goto cleanup;
-
-journal_error:
- ext3_std_error(dir->i_sb, err);
-cleanup:
- if (bh)
- brelse(bh);
- dx_release(frames);
- return err;
-}
-
-/*
- * ext3_delete_entry deletes a directory entry by merging it with the
- * previous entry
- */
-static int ext3_delete_entry (handle_t *handle,
- struct inode * dir,
- struct ext3_dir_entry_2 * de_del,
- struct buffer_head * bh)
-{
- struct ext3_dir_entry_2 * de, * pde;
- int i;
-
- i = 0;
- pde = NULL;
- de = (struct ext3_dir_entry_2 *) bh->b_data;
- while (i < bh->b_size) {
- if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i))
- return -EIO;
- if (de == de_del) {
- int err;
-
- BUFFER_TRACE(bh, "get_write_access");
- err = ext3_journal_get_write_access(handle, bh);
- if (err)
- goto journal_error;
-
- if (pde)
- pde->rec_len = ext3_rec_len_to_disk(
- ext3_rec_len_from_disk(pde->rec_len) +
- ext3_rec_len_from_disk(de->rec_len));
- else
- de->inode = 0;
- dir->i_version++;
- BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata");
- err = ext3_journal_dirty_metadata(handle, bh);
- if (err) {
-journal_error:
- ext3_std_error(dir->i_sb, err);
- return err;
- }
- return 0;
- }
- i += ext3_rec_len_from_disk(de->rec_len);
- pde = de;
- de = ext3_next_entry(de);
- }
- return -ENOENT;
-}
-
-static int ext3_add_nondir(handle_t *handle,
- struct dentry *dentry, struct inode *inode)
-{
- int err = ext3_add_entry(handle, dentry, inode);
- if (!err) {
- ext3_mark_inode_dirty(handle, inode);
- unlock_new_inode(inode);
- d_instantiate(dentry, inode);
- return 0;
- }
- drop_nlink(inode);
- unlock_new_inode(inode);
- iput(inode);
- return err;
-}
-
-/*
- * By the time this is called, we already have created
- * the directory cache entry for the new file, but it
- * is so far negative - it has no inode.
- *
- * If the create succeeds, we fill in the inode information
- * with d_instantiate().
- */
-static int ext3_create (struct inode * dir, struct dentry * dentry, umode_t mode,
- bool excl)
-{
- handle_t *handle;
- struct inode * inode;
- int err, retries = 0;
-
- dquot_initialize(dir);
-
-retry:
- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- inode = ext3_new_inode (handle, dir, &dentry->d_name, mode);
- err = PTR_ERR(inode);
- if (!IS_ERR(inode)) {
- inode->i_op = &ext3_file_inode_operations;
- inode->i_fop = &ext3_file_operations;
- ext3_set_aops(inode);
- err = ext3_add_nondir(handle, dentry, inode);
- }
- ext3_journal_stop(handle);
- if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
- goto retry;
- return err;
-}
-
-static int ext3_mknod (struct inode * dir, struct dentry *dentry,
- umode_t mode, dev_t rdev)
-{
- handle_t *handle;
- struct inode *inode;
- int err, retries = 0;
-
- if (!new_valid_dev(rdev))
- return -EINVAL;
-
- dquot_initialize(dir);
-
-retry:
- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- inode = ext3_new_inode (handle, dir, &dentry->d_name, mode);
- err = PTR_ERR(inode);
- if (!IS_ERR(inode)) {
- init_special_inode(inode, inode->i_mode, rdev);
-#ifdef CONFIG_EXT3_FS_XATTR
- inode->i_op = &ext3_special_inode_operations;
-#endif
- err = ext3_add_nondir(handle, dentry, inode);
- }
- ext3_journal_stop(handle);
- if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
- goto retry;
- return err;
-}
-
-static int ext3_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
-{
- handle_t *handle;
- struct inode *inode;
- int err, retries = 0;
-
- dquot_initialize(dir);
-
-retry:
- handle = ext3_journal_start(dir, EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
- 4 + EXT3_XATTR_TRANS_BLOCKS);
-
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- inode = ext3_new_inode (handle, dir, NULL, mode);
- err = PTR_ERR(inode);
- if (!IS_ERR(inode)) {
- inode->i_op = &ext3_file_inode_operations;
- inode->i_fop = &ext3_file_operations;
- ext3_set_aops(inode);
- d_tmpfile(dentry, inode);
- err = ext3_orphan_add(handle, inode);
- if (err)
- goto err_unlock_inode;
- mark_inode_dirty(inode);
- unlock_new_inode(inode);
- }
- ext3_journal_stop(handle);
- if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
- goto retry;
- return err;
-err_unlock_inode:
- ext3_journal_stop(handle);
- unlock_new_inode(inode);
- return err;
-}
-
-static int ext3_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
-{
- handle_t *handle;
- struct inode * inode;
- struct buffer_head * dir_block = NULL;
- struct ext3_dir_entry_2 * de;
- int err, retries = 0;
-
- if (dir->i_nlink >= EXT3_LINK_MAX)
- return -EMLINK;
-
- dquot_initialize(dir);
-
-retry:
- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- inode = ext3_new_inode (handle, dir, &dentry->d_name, S_IFDIR | mode);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_stop;
-
- inode->i_op = &ext3_dir_inode_operations;
- inode->i_fop = &ext3_dir_operations;
- inode->i_size = EXT3_I(inode)->i_disksize = inode->i_sb->s_blocksize;
- if (!(dir_block = ext3_dir_bread(handle, inode, 0, 1, &err)))
- goto out_clear_inode;
-
- BUFFER_TRACE(dir_block, "get_write_access");
- err = ext3_journal_get_write_access(handle, dir_block);
- if (err)
- goto out_clear_inode;
-
- de = (struct ext3_dir_entry_2 *) dir_block->b_data;
- de->inode = cpu_to_le32(inode->i_ino);
- de->name_len = 1;
- de->rec_len = ext3_rec_len_to_disk(EXT3_DIR_REC_LEN(de->name_len));
- strcpy (de->name, ".");
- ext3_set_de_type(dir->i_sb, de, S_IFDIR);
- de = ext3_next_entry(de);
- de->inode = cpu_to_le32(dir->i_ino);
- de->rec_len = ext3_rec_len_to_disk(inode->i_sb->s_blocksize -
- EXT3_DIR_REC_LEN(1));
- de->name_len = 2;
- strcpy (de->name, "..");
- ext3_set_de_type(dir->i_sb, de, S_IFDIR);
- set_nlink(inode, 2);
- BUFFER_TRACE(dir_block, "call ext3_journal_dirty_metadata");
- err = ext3_journal_dirty_metadata(handle, dir_block);
- if (err)
- goto out_clear_inode;
-
- err = ext3_mark_inode_dirty(handle, inode);
- if (!err)
- err = ext3_add_entry (handle, dentry, inode);
-
- if (err) {
-out_clear_inode:
- clear_nlink(inode);
- unlock_new_inode(inode);
- ext3_mark_inode_dirty(handle, inode);
- iput (inode);
- goto out_stop;
- }
- inc_nlink(dir);
- ext3_update_dx_flag(dir);
- err = ext3_mark_inode_dirty(handle, dir);
- if (err)
- goto out_clear_inode;
-
- unlock_new_inode(inode);
- d_instantiate(dentry, inode);
-out_stop:
- brelse(dir_block);
- ext3_journal_stop(handle);
- if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
- goto retry;
- return err;
-}
-
-/*
- * routine to check that the specified directory is empty (for rmdir)
- */
-static int empty_dir (struct inode * inode)
-{
- unsigned long offset;
- struct buffer_head * bh;
- struct ext3_dir_entry_2 * de, * de1;
- struct super_block * sb;
- int err = 0;
-
- sb = inode->i_sb;
- if (inode->i_size < EXT3_DIR_REC_LEN(1) + EXT3_DIR_REC_LEN(2) ||
- !(bh = ext3_dir_bread(NULL, inode, 0, 0, &err))) {
- if (err)
- ext3_error(inode->i_sb, __func__,
- "error %d reading directory #%lu offset 0",
- err, inode->i_ino);
- else
- ext3_warning(inode->i_sb, __func__,
- "bad directory (dir #%lu) - no data block",
- inode->i_ino);
- return 1;
- }
- de = (struct ext3_dir_entry_2 *) bh->b_data;
- de1 = ext3_next_entry(de);
- if (le32_to_cpu(de->inode) != inode->i_ino ||
- !le32_to_cpu(de1->inode) ||
- strcmp (".", de->name) ||
- strcmp ("..", de1->name)) {
- ext3_warning (inode->i_sb, "empty_dir",
- "bad directory (dir #%lu) - no `.' or `..'",
- inode->i_ino);
- brelse (bh);
- return 1;
- }
- offset = ext3_rec_len_from_disk(de->rec_len) +
- ext3_rec_len_from_disk(de1->rec_len);
- de = ext3_next_entry(de1);
- while (offset < inode->i_size ) {
- if (!bh ||
- (void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
- err = 0;
- brelse (bh);
- if (!(bh = ext3_dir_bread (NULL, inode,
- offset >> EXT3_BLOCK_SIZE_BITS(sb), 0, &err))) {
- if (err)
- ext3_error(sb, __func__,
- "error %d reading directory"
- " #%lu offset %lu",
- err, inode->i_ino, offset);
- offset += sb->s_blocksize;
- continue;
- }
- de = (struct ext3_dir_entry_2 *) bh->b_data;
- }
- if (!ext3_check_dir_entry("empty_dir", inode, de, bh, offset)) {
- de = (struct ext3_dir_entry_2 *)(bh->b_data +
- sb->s_blocksize);
- offset = (offset | (sb->s_blocksize - 1)) + 1;
- continue;
- }
- if (le32_to_cpu(de->inode)) {
- brelse (bh);
- return 0;
- }
- offset += ext3_rec_len_from_disk(de->rec_len);
- de = ext3_next_entry(de);
- }
- brelse (bh);
- return 1;
-}
-
-/* ext3_orphan_add() links an unlinked or truncated inode into a list of
- * such inodes, starting at the superblock, in case we crash before the
- * file is closed/deleted, or in case the inode truncate spans multiple
- * transactions and the last transaction is not recovered after a crash.
- *
- * At filesystem recovery time, we walk this list deleting unlinked
- * inodes and truncating linked inodes in ext3_orphan_cleanup().
- */
-int ext3_orphan_add(handle_t *handle, struct inode *inode)
-{
- struct super_block *sb = inode->i_sb;
- struct ext3_iloc iloc;
- int err = 0, rc;
-
- mutex_lock(&EXT3_SB(sb)->s_orphan_lock);
- if (!list_empty(&EXT3_I(inode)->i_orphan))
- goto out_unlock;
-
- /* Orphan handling is only valid for files with data blocks
- * being truncated, or files being unlinked. */
-
- /* @@@ FIXME: Observation from aviro:
- * I think I can trigger J_ASSERT in ext3_orphan_add(). We block
- * here (on s_orphan_lock), so race with ext3_link() which might bump
- * ->i_nlink. For, say it, character device. Not a regular file,
- * not a directory, not a symlink and ->i_nlink > 0.
- *
- * tytso, 4/25/2009: I'm not sure how that could happen;
- * shouldn't the fs core protect us from these sort of
- * unlink()/link() races?
- */
- J_ASSERT ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
- S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
-
- BUFFER_TRACE(EXT3_SB(sb)->s_sbh, "get_write_access");
- err = ext3_journal_get_write_access(handle, EXT3_SB(sb)->s_sbh);
- if (err)
- goto out_unlock;
-
- err = ext3_reserve_inode_write(handle, inode, &iloc);
- if (err)
- goto out_unlock;
-
- /* Insert this inode at the head of the on-disk orphan list... */
- NEXT_ORPHAN(inode) = le32_to_cpu(EXT3_SB(sb)->s_es->s_last_orphan);
- EXT3_SB(sb)->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
- err = ext3_journal_dirty_metadata(handle, EXT3_SB(sb)->s_sbh);
- rc = ext3_mark_iloc_dirty(handle, inode, &iloc);
- if (!err)
- err = rc;
-
- /* Only add to the head of the in-memory list if all the
- * previous operations succeeded. If the orphan_add is going to
- * fail (possibly taking the journal offline), we can't risk
- * leaving the inode on the orphan list: stray orphan-list
- * entries can cause panics at unmount time.
- *
- * This is safe: on error we're going to ignore the orphan list
- * anyway on the next recovery. */
- if (!err)
- list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
-
- jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
- jbd_debug(4, "orphan inode %lu will point to %d\n",
- inode->i_ino, NEXT_ORPHAN(inode));
-out_unlock:
- mutex_unlock(&EXT3_SB(sb)->s_orphan_lock);
- ext3_std_error(inode->i_sb, err);
- return err;
-}
-
-/*
- * ext3_orphan_del() removes an unlinked or truncated inode from the list
- * of such inodes stored on disk, because it is finally being cleaned up.
- */
-int ext3_orphan_del(handle_t *handle, struct inode *inode)
-{
- struct list_head *prev;
- struct ext3_inode_info *ei = EXT3_I(inode);
- struct ext3_sb_info *sbi;
- unsigned long ino_next;
- struct ext3_iloc iloc;
- int err = 0;
-
- mutex_lock(&EXT3_SB(inode->i_sb)->s_orphan_lock);
- if (list_empty(&ei->i_orphan))
- goto out;
-
- ino_next = NEXT_ORPHAN(inode);
- prev = ei->i_orphan.prev;
- sbi = EXT3_SB(inode->i_sb);
-
- jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
-
- list_del_init(&ei->i_orphan);
-
- /* If we're on an error path, we may not have a valid
- * transaction handle with which to update the orphan list on
- * disk, but we still need to remove the inode from the linked
- * list in memory. */
- if (!handle)
- goto out;
-
- err = ext3_reserve_inode_write(handle, inode, &iloc);
- if (err)
- goto out_err;
-
- if (prev == &sbi->s_orphan) {
- jbd_debug(4, "superblock will point to %lu\n", ino_next);
- BUFFER_TRACE(sbi->s_sbh, "get_write_access");
- err = ext3_journal_get_write_access(handle, sbi->s_sbh);
- if (err)
- goto out_brelse;
- sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
- err = ext3_journal_dirty_metadata(handle, sbi->s_sbh);
- } else {
- struct ext3_iloc iloc2;
- struct inode *i_prev =
- &list_entry(prev, struct ext3_inode_info, i_orphan)->vfs_inode;
-
- jbd_debug(4, "orphan inode %lu will point to %lu\n",
- i_prev->i_ino, ino_next);
- err = ext3_reserve_inode_write(handle, i_prev, &iloc2);
- if (err)
- goto out_brelse;
- NEXT_ORPHAN(i_prev) = ino_next;
- err = ext3_mark_iloc_dirty(handle, i_prev, &iloc2);
- }
- if (err)
- goto out_brelse;
- NEXT_ORPHAN(inode) = 0;
- err = ext3_mark_iloc_dirty(handle, inode, &iloc);
-
-out_err:
- ext3_std_error(inode->i_sb, err);
-out:
- mutex_unlock(&EXT3_SB(inode->i_sb)->s_orphan_lock);
- return err;
-
-out_brelse:
- brelse(iloc.bh);
- goto out_err;
-}
-
-static int ext3_rmdir (struct inode * dir, struct dentry *dentry)
-{
- int retval;
- struct inode * inode;
- struct buffer_head * bh;
- struct ext3_dir_entry_2 * de;
- handle_t *handle;
-
- /* Initialize quotas before so that eventual writes go in
- * separate transaction */
- dquot_initialize(dir);
- dquot_initialize(d_inode(dentry));
-
- handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- retval = -ENOENT;
- bh = ext3_find_entry(dir, &dentry->d_name, &de);
- if (!bh)
- goto end_rmdir;
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- inode = d_inode(dentry);
-
- retval = -EIO;
- if (le32_to_cpu(de->inode) != inode->i_ino)
- goto end_rmdir;
-
- retval = -ENOTEMPTY;
- if (!empty_dir (inode))
- goto end_rmdir;
-
- retval = ext3_delete_entry(handle, dir, de, bh);
- if (retval)
- goto end_rmdir;
- if (inode->i_nlink != 2)
- ext3_warning (inode->i_sb, "ext3_rmdir",
- "empty directory has nlink!=2 (%d)",
- inode->i_nlink);
- inode->i_version++;
- clear_nlink(inode);
- /* There's no need to set i_disksize: the fact that i_nlink is
- * zero will ensure that the right thing happens during any
- * recovery. */
- inode->i_size = 0;
- ext3_orphan_add(handle, inode);
- inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
- ext3_mark_inode_dirty(handle, inode);
- drop_nlink(dir);
- ext3_update_dx_flag(dir);
- ext3_mark_inode_dirty(handle, dir);
-
-end_rmdir:
- ext3_journal_stop(handle);
- brelse (bh);
- return retval;
-}
-
-static int ext3_unlink(struct inode * dir, struct dentry *dentry)
-{
- int retval;
- struct inode * inode;
- struct buffer_head * bh;
- struct ext3_dir_entry_2 * de;
- handle_t *handle;
-
- trace_ext3_unlink_enter(dir, dentry);
- /* Initialize quotas before so that eventual writes go
- * in separate transaction */
- dquot_initialize(dir);
- dquot_initialize(d_inode(dentry));
-
- handle = ext3_journal_start(dir, EXT3_DELETE_TRANS_BLOCKS(dir->i_sb));
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- retval = -ENOENT;
- bh = ext3_find_entry(dir, &dentry->d_name, &de);
- if (!bh)
- goto end_unlink;
-
- inode = d_inode(dentry);
-
- retval = -EIO;
- if (le32_to_cpu(de->inode) != inode->i_ino)
- goto end_unlink;
-
- if (!inode->i_nlink) {
- ext3_warning (inode->i_sb, "ext3_unlink",
- "Deleting nonexistent file (%lu), %d",
- inode->i_ino, inode->i_nlink);
- set_nlink(inode, 1);
- }
- retval = ext3_delete_entry(handle, dir, de, bh);
- if (retval)
- goto end_unlink;
- dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
- ext3_update_dx_flag(dir);
- ext3_mark_inode_dirty(handle, dir);
- drop_nlink(inode);
- if (!inode->i_nlink)
- ext3_orphan_add(handle, inode);
- inode->i_ctime = dir->i_ctime;
- ext3_mark_inode_dirty(handle, inode);
- retval = 0;
-
-end_unlink:
- ext3_journal_stop(handle);
- brelse (bh);
- trace_ext3_unlink_exit(dentry, retval);
- return retval;
-}
-
-static int ext3_symlink (struct inode * dir,
- struct dentry *dentry, const char * symname)
-{
- handle_t *handle;
- struct inode * inode;
- int l, err, retries = 0;
- int credits;
-
- l = strlen(symname)+1;
- if (l > dir->i_sb->s_blocksize)
- return -ENAMETOOLONG;
-
- dquot_initialize(dir);
-
- if (l > EXT3_N_BLOCKS * 4) {
- /*
- * For non-fast symlinks, we just allocate inode and put it on
- * orphan list in the first transaction => we need bitmap,
- * group descriptor, sb, inode block, quota blocks, and
- * possibly selinux xattr blocks.
- */
- credits = 4 + EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
- EXT3_XATTR_TRANS_BLOCKS;
- } else {
- /*
- * Fast symlink. We have to add entry to directory
- * (EXT3_DATA_TRANS_BLOCKS + EXT3_INDEX_EXTRA_TRANS_BLOCKS),
- * allocate new inode (bitmap, group descriptor, inode block,
- * quota blocks, sb is already counted in previous macros).
- */
- credits = EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 3 +
- EXT3_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
- }
-retry:
- handle = ext3_journal_start(dir, credits);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- inode = ext3_new_inode (handle, dir, &dentry->d_name, S_IFLNK|S_IRWXUGO);
- err = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto out_stop;
-
- if (l > EXT3_N_BLOCKS * 4) {
- inode->i_op = &ext3_symlink_inode_operations;
- ext3_set_aops(inode);
- /*
- * We cannot call page_symlink() with transaction started
- * because it calls into ext3_write_begin() which acquires page
- * lock which ranks below transaction start (and it can also
- * wait for journal commit if we are running out of space). So
- * we have to stop transaction now and restart it when symlink
- * contents is written.
- *
- * To keep fs consistent in case of crash, we have to put inode
- * to orphan list in the mean time.
- */
- drop_nlink(inode);
- err = ext3_orphan_add(handle, inode);
- ext3_journal_stop(handle);
- if (err)
- goto err_drop_inode;
- err = __page_symlink(inode, symname, l, 1);
- if (err)
- goto err_drop_inode;
- /*
- * Now inode is being linked into dir (EXT3_DATA_TRANS_BLOCKS
- * + EXT3_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
- */
- handle = ext3_journal_start(dir,
- EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 1);
- if (IS_ERR(handle)) {
- err = PTR_ERR(handle);
- goto err_drop_inode;
- }
- set_nlink(inode, 1);
- err = ext3_orphan_del(handle, inode);
- if (err) {
- ext3_journal_stop(handle);
- drop_nlink(inode);
- goto err_drop_inode;
- }
- } else {
- inode->i_op = &ext3_fast_symlink_inode_operations;
- memcpy((char*)&EXT3_I(inode)->i_data,symname,l);
- inode->i_size = l-1;
- }
- EXT3_I(inode)->i_disksize = inode->i_size;
- err = ext3_add_nondir(handle, dentry, inode);
-out_stop:
- ext3_journal_stop(handle);
- if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
- goto retry;
- return err;
-err_drop_inode:
- unlock_new_inode(inode);
- iput(inode);
- return err;
-}
-
-static int ext3_link (struct dentry * old_dentry,
- struct inode * dir, struct dentry *dentry)
-{
- handle_t *handle;
- struct inode *inode = d_inode(old_dentry);
- int err, retries = 0;
-
- if (inode->i_nlink >= EXT3_LINK_MAX)
- return -EMLINK;
-
- dquot_initialize(dir);
-
-retry:
- handle = ext3_journal_start(dir, EXT3_DATA_TRANS_BLOCKS(dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 1);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(dir))
- handle->h_sync = 1;
-
- inode->i_ctime = CURRENT_TIME_SEC;
- inc_nlink(inode);
- ihold(inode);
-
- err = ext3_add_entry(handle, dentry, inode);
- if (!err) {
- ext3_mark_inode_dirty(handle, inode);
- /* this can happen only for tmpfile being
- * linked the first time
- */
- if (inode->i_nlink == 1)
- ext3_orphan_del(handle, inode);
- d_instantiate(dentry, inode);
- } else {
- drop_nlink(inode);
- iput(inode);
- }
- ext3_journal_stop(handle);
- if (err == -ENOSPC && ext3_should_retry_alloc(dir->i_sb, &retries))
- goto retry;
- return err;
-}
-
-#define PARENT_INO(buffer) \
- (ext3_next_entry((struct ext3_dir_entry_2 *)(buffer))->inode)
-
-/*
- * Anybody can rename anything with this: the permission checks are left to the
- * higher-level routines.
- */
-static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
- struct inode * new_dir,struct dentry *new_dentry)
-{
- handle_t *handle;
- struct inode * old_inode, * new_inode;
- struct buffer_head * old_bh, * new_bh, * dir_bh;
- struct ext3_dir_entry_2 * old_de, * new_de;
- int retval, flush_file = 0;
-
- dquot_initialize(old_dir);
- dquot_initialize(new_dir);
-
- old_bh = new_bh = dir_bh = NULL;
-
- /* Initialize quotas before so that eventual writes go
- * in separate transaction */
- if (d_really_is_positive(new_dentry))
- dquot_initialize(d_inode(new_dentry));
- handle = ext3_journal_start(old_dir, 2 *
- EXT3_DATA_TRANS_BLOCKS(old_dir->i_sb) +
- EXT3_INDEX_EXTRA_TRANS_BLOCKS + 2);
- if (IS_ERR(handle))
- return PTR_ERR(handle);
-
- if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
- handle->h_sync = 1;
-
- old_bh = ext3_find_entry(old_dir, &old_dentry->d_name, &old_de);
- /*
- * Check for inode number is _not_ due to possible IO errors.
- * We might rmdir the source, keep it as pwd of some process
- * and merrily kill the link to whatever was created under the
- * same name. Goodbye sticky bit ;-<
- */
- old_inode = d_inode(old_dentry);
- retval = -ENOENT;
- if (!old_bh || le32_to_cpu(old_de->inode) != old_inode->i_ino)
- goto end_rename;
-
- new_inode = d_inode(new_dentry);
- new_bh = ext3_find_entry(new_dir, &new_dentry->d_name, &new_de);
- if (new_bh) {
- if (!new_inode) {
- brelse (new_bh);
- new_bh = NULL;
- }
- }
- if (S_ISDIR(old_inode->i_mode)) {
- if (new_inode) {
- retval = -ENOTEMPTY;
- if (!empty_dir (new_inode))
- goto end_rename;
- }
- retval = -EIO;
- dir_bh = ext3_dir_bread(handle, old_inode, 0, 0, &retval);
- if (!dir_bh)
- goto end_rename;
- if (le32_to_cpu(PARENT_INO(dir_bh->b_data)) != old_dir->i_ino)
- goto end_rename;
- retval = -EMLINK;
- if (!new_inode && new_dir!=old_dir &&
- new_dir->i_nlink >= EXT3_LINK_MAX)
- goto end_rename;
- }
- if (!new_bh) {
- retval = ext3_add_entry (handle, new_dentry, old_inode);
- if (retval)
- goto end_rename;
- } else {
- BUFFER_TRACE(new_bh, "get write access");
- retval = ext3_journal_get_write_access(handle, new_bh);
- if (retval)
- goto journal_error;
- new_de->inode = cpu_to_le32(old_inode->i_ino);
- if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
- EXT3_FEATURE_INCOMPAT_FILETYPE))
- new_de->file_type = old_de->file_type;
- new_dir->i_version++;
- new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME_SEC;
- ext3_mark_inode_dirty(handle, new_dir);
- BUFFER_TRACE(new_bh, "call ext3_journal_dirty_metadata");
- retval = ext3_journal_dirty_metadata(handle, new_bh);
- if (retval)
- goto journal_error;
- brelse(new_bh);
- new_bh = NULL;
- }
-
- /*
- * Like most other Unix systems, set the ctime for inodes on a
- * rename.
- */
- old_inode->i_ctime = CURRENT_TIME_SEC;
- ext3_mark_inode_dirty(handle, old_inode);
-
- /*
- * ok, that's it
- */
- if (le32_to_cpu(old_de->inode) != old_inode->i_ino ||
- old_de->name_len != old_dentry->d_name.len ||
- strncmp(old_de->name, old_dentry->d_name.name, old_de->name_len) ||
- (retval = ext3_delete_entry(handle, old_dir,
- old_de, old_bh)) == -ENOENT) {
- /* old_de could have moved from under us during htree split, so
- * make sure that we are deleting the right entry. We might
- * also be pointing to a stale entry in the unused part of
- * old_bh so just checking inum and the name isn't enough. */
- struct buffer_head *old_bh2;
- struct ext3_dir_entry_2 *old_de2;
-
- old_bh2 = ext3_find_entry(old_dir, &old_dentry->d_name,
- &old_de2);
- if (old_bh2) {
- retval = ext3_delete_entry(handle, old_dir,
- old_de2, old_bh2);
- brelse(old_bh2);
- }
- }
- if (retval) {
- ext3_warning(old_dir->i_sb, "ext3_rename",
- "Deleting old file (%lu), %d, error=%d",
- old_dir->i_ino, old_dir->i_nlink, retval);
- }
-
- if (new_inode) {
- drop_nlink(new_inode);
- new_inode->i_ctime = CURRENT_TIME_SEC;
- }
- old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
- ext3_update_dx_flag(old_dir);
- if (dir_bh) {
- BUFFER_TRACE(dir_bh, "get_write_access");
- retval = ext3_journal_get_write_access(handle, dir_bh);
- if (retval)
- goto journal_error;
- PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
- BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata");
- retval = ext3_journal_dirty_metadata(handle, dir_bh);
- if (retval) {
-journal_error:
- ext3_std_error(new_dir->i_sb, retval);
- goto end_rename;
- }
- drop_nlink(old_dir);
- if (new_inode) {
- drop_nlink(new_inode);
- } else {
- inc_nlink(new_dir);
- ext3_update_dx_flag(new_dir);
- ext3_mark_inode_dirty(handle, new_dir);
- }
- }
- ext3_mark_inode_dirty(handle, old_dir);
- if (new_inode) {
- ext3_mark_inode_dirty(handle, new_inode);
- if (!new_inode->i_nlink)
- ext3_orphan_add(handle, new_inode);
- if (ext3_should_writeback_data(new_inode))
- flush_file = 1;
- }
- retval = 0;
-
-end_rename:
- brelse (dir_bh);
- brelse (old_bh);
- brelse (new_bh);
- ext3_journal_stop(handle);
- if (retval == 0 && flush_file)
- filemap_flush(old_inode->i_mapping);
- return retval;
-}
-
-/*
- * directories can handle most operations...
- */
-const struct inode_operations ext3_dir_inode_operations = {
- .create = ext3_create,
- .lookup = ext3_lookup,
- .link = ext3_link,
- .unlink = ext3_unlink,
- .symlink = ext3_symlink,
- .mkdir = ext3_mkdir,
- .rmdir = ext3_rmdir,
- .mknod = ext3_mknod,
- .tmpfile = ext3_tmpfile,
- .rename = ext3_rename,
- .setattr = ext3_setattr,
-#ifdef CONFIG_EXT3_FS_XATTR
- .setxattr = generic_setxattr,
- .getxattr = generic_getxattr,
- .listxattr = ext3_listxattr,
- .removexattr = generic_removexattr,
-#endif
- .get_acl = ext3_get_acl,
- .set_acl = ext3_set_acl,
-};
-
-const struct inode_operations ext3_special_inode_operations = {
- .setattr = ext3_setattr,
-#ifdef CONFIG_EXT3_FS_XATTR
- .setxattr = generic_setxattr,
- .getxattr = generic_getxattr,
- .listxattr = ext3_listxattr,
- .removexattr = generic_removexattr,
-#endif
- .get_acl = ext3_get_acl,
- .set_acl = ext3_set_acl,
-};