| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * dir.c |
| * |
| * Creates, reads, walks and deletes directory-nodes |
| * |
| * Copyright (C) 2002, 2004 Oracle. All rights reserved. |
| * |
| * Portions of this code from linux/fs/ext3/dir.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/dir.c |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| */ |
| |
| #include <linux/fs.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/highmem.h> |
| #include <linux/quotaops.h> |
| #include <linux/sort.h> |
| #include <linux/iversion.h> |
| |
| #include <cluster/masklog.h> |
| |
| #include "ocfs2.h" |
| |
| #include "alloc.h" |
| #include "blockcheck.h" |
| #include "dir.h" |
| #include "dlmglue.h" |
| #include "extent_map.h" |
| #include "file.h" |
| #include "inode.h" |
| #include "journal.h" |
| #include "namei.h" |
| #include "suballoc.h" |
| #include "super.h" |
| #include "sysfile.h" |
| #include "uptodate.h" |
| #include "ocfs2_trace.h" |
| |
| #include "buffer_head_io.h" |
| |
| #define NAMEI_RA_CHUNKS 2 |
| #define NAMEI_RA_BLOCKS 4 |
| #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) |
| |
| static int ocfs2_do_extend_dir(struct super_block *sb, |
| handle_t *handle, |
| struct inode *dir, |
| struct buffer_head *parent_fe_bh, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac, |
| struct buffer_head **new_bh); |
| static int ocfs2_dir_indexed(struct inode *inode); |
| |
| /* |
| * These are distinct checks because future versions of the file system will |
| * want to have a trailing dirent structure independent of indexing. |
| */ |
| static int ocfs2_supports_dir_trailer(struct inode *dir) |
| { |
| struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); |
| |
| if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| return 0; |
| |
| return ocfs2_meta_ecc(osb) || ocfs2_dir_indexed(dir); |
| } |
| |
| /* |
| * "new' here refers to the point at which we're creating a new |
| * directory via "mkdir()", but also when we're expanding an inline |
| * directory. In either case, we don't yet have the indexing bit set |
| * on the directory, so the standard checks will fail in when metaecc |
| * is turned off. Only directory-initialization type functions should |
| * use this then. Everything else wants ocfs2_supports_dir_trailer() |
| */ |
| static int ocfs2_new_dir_wants_trailer(struct inode *dir) |
| { |
| struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); |
| |
| return ocfs2_meta_ecc(osb) || |
| ocfs2_supports_indexed_dirs(osb); |
| } |
| |
| static inline unsigned int ocfs2_dir_trailer_blk_off(struct super_block *sb) |
| { |
| return sb->s_blocksize - sizeof(struct ocfs2_dir_block_trailer); |
| } |
| |
| #define ocfs2_trailer_from_bh(_bh, _sb) ((struct ocfs2_dir_block_trailer *) ((_bh)->b_data + ocfs2_dir_trailer_blk_off((_sb)))) |
| |
| /* XXX ocfs2_block_dqtrailer() is similar but not quite - can we make |
| * them more consistent? */ |
| struct ocfs2_dir_block_trailer *ocfs2_dir_trailer_from_size(int blocksize, |
| void *data) |
| { |
| char *p = data; |
| |
| p += blocksize - sizeof(struct ocfs2_dir_block_trailer); |
| return (struct ocfs2_dir_block_trailer *)p; |
| } |
| |
| /* |
| * XXX: This is executed once on every dirent. We should consider optimizing |
| * it. |
| */ |
| static int ocfs2_skip_dir_trailer(struct inode *dir, |
| struct ocfs2_dir_entry *de, |
| unsigned long offset, |
| unsigned long blklen) |
| { |
| unsigned long toff = blklen - sizeof(struct ocfs2_dir_block_trailer); |
| |
| if (!ocfs2_supports_dir_trailer(dir)) |
| return 0; |
| |
| if (offset != toff) |
| return 0; |
| |
| return 1; |
| } |
| |
| static void ocfs2_init_dir_trailer(struct inode *inode, |
| struct buffer_head *bh, u16 rec_len) |
| { |
| struct ocfs2_dir_block_trailer *trailer; |
| |
| trailer = ocfs2_trailer_from_bh(bh, inode->i_sb); |
| strcpy(trailer->db_signature, OCFS2_DIR_TRAILER_SIGNATURE); |
| trailer->db_compat_rec_len = |
| cpu_to_le16(sizeof(struct ocfs2_dir_block_trailer)); |
| trailer->db_parent_dinode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); |
| trailer->db_blkno = cpu_to_le64(bh->b_blocknr); |
| trailer->db_free_rec_len = cpu_to_le16(rec_len); |
| } |
| /* |
| * Link an unindexed block with a dir trailer structure into the index free |
| * list. This function will modify dirdata_bh, but assumes you've already |
| * passed it to the journal. |
| */ |
| static int ocfs2_dx_dir_link_trailer(struct inode *dir, handle_t *handle, |
| struct buffer_head *dx_root_bh, |
| struct buffer_head *dirdata_bh) |
| { |
| int ret; |
| struct ocfs2_dx_root_block *dx_root; |
| struct ocfs2_dir_block_trailer *trailer; |
| |
| ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| trailer = ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb); |
| dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; |
| |
| trailer->db_free_next = dx_root->dr_free_blk; |
| dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr); |
| |
| ocfs2_journal_dirty(handle, dx_root_bh); |
| |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_free_list_at_root(struct ocfs2_dir_lookup_result *res) |
| { |
| return res->dl_prev_leaf_bh == NULL; |
| } |
| |
| void ocfs2_free_dir_lookup_result(struct ocfs2_dir_lookup_result *res) |
| { |
| brelse(res->dl_dx_root_bh); |
| brelse(res->dl_leaf_bh); |
| brelse(res->dl_dx_leaf_bh); |
| brelse(res->dl_prev_leaf_bh); |
| } |
| |
| static int ocfs2_dir_indexed(struct inode *inode) |
| { |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INDEXED_DIR_FL) |
| return 1; |
| return 0; |
| } |
| |
| static inline int ocfs2_dx_root_inline(struct ocfs2_dx_root_block *dx_root) |
| { |
| return dx_root->dr_flags & OCFS2_DX_FLAG_INLINE; |
| } |
| |
| /* |
| * Hashing code adapted from ext3 |
| */ |
| #define DELTA 0x9E3779B9 |
| |
| static void TEA_transform(__u32 buf[4], __u32 const in[]) |
| { |
| __u32 sum = 0; |
| __u32 b0 = buf[0], b1 = buf[1]; |
| __u32 a = in[0], b = in[1], c = in[2], d = in[3]; |
| int n = 16; |
| |
| do { |
| sum += DELTA; |
| b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b); |
| b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d); |
| } while (--n); |
| |
| buf[0] += b0; |
| buf[1] += b1; |
| } |
| |
| static void str2hashbuf(const char *msg, int len, __u32 *buf, int num) |
| { |
| __u32 pad, val; |
| int i; |
| |
| pad = (__u32)len | ((__u32)len << 8); |
| pad |= pad << 16; |
| |
| val = pad; |
| if (len > num*4) |
| len = num * 4; |
| for (i = 0; i < len; i++) { |
| if ((i % 4) == 0) |
| val = pad; |
| val = msg[i] + (val << 8); |
| if ((i % 4) == 3) { |
| *buf++ = val; |
| val = pad; |
| num--; |
| } |
| } |
| if (--num >= 0) |
| *buf++ = val; |
| while (--num >= 0) |
| *buf++ = pad; |
| } |
| |
| static void ocfs2_dx_dir_name_hash(struct inode *dir, const char *name, int len, |
| struct ocfs2_dx_hinfo *hinfo) |
| { |
| struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); |
| const char *p; |
| __u32 in[8], buf[4]; |
| |
| /* |
| * XXX: Is this really necessary, if the index is never looked |
| * at by readdir? Is a hash value of '0' a bad idea? |
| */ |
| if ((len == 1 && !strncmp(".", name, 1)) || |
| (len == 2 && !strncmp("..", name, 2))) { |
| buf[0] = buf[1] = 0; |
| goto out; |
| } |
| |
| #ifdef OCFS2_DEBUG_DX_DIRS |
| /* |
| * This makes it very easy to debug indexing problems. We |
| * should never allow this to be selected without hand editing |
| * this file though. |
| */ |
| buf[0] = buf[1] = len; |
| goto out; |
| #endif |
| |
| memcpy(buf, osb->osb_dx_seed, sizeof(buf)); |
| |
| p = name; |
| while (len > 0) { |
| str2hashbuf(p, len, in, 4); |
| TEA_transform(buf, in); |
| len -= 16; |
| p += 16; |
| } |
| |
| out: |
| hinfo->major_hash = buf[0]; |
| hinfo->minor_hash = buf[1]; |
| } |
| |
| /* |
| * bh passed here can be an inode block or a dir data block, depending |
| * on the inode inline data flag. |
| */ |
| static int ocfs2_check_dir_entry(struct inode * dir, |
| struct ocfs2_dir_entry * de, |
| struct buffer_head * bh, |
| unsigned long offset) |
| { |
| const char *error_msg = NULL; |
| const int rlen = le16_to_cpu(de->rec_len); |
| |
| if (unlikely(rlen < OCFS2_DIR_REC_LEN(1))) |
| error_msg = "rec_len is smaller than minimal"; |
| else if (unlikely(rlen % 4 != 0)) |
| error_msg = "rec_len % 4 != 0"; |
| else if (unlikely(rlen < OCFS2_DIR_REC_LEN(de->name_len))) |
| error_msg = "rec_len is too small for name_len"; |
| else if (unlikely( |
| ((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)) |
| error_msg = "directory entry across blocks"; |
| |
| if (unlikely(error_msg != NULL)) |
| mlog(ML_ERROR, "bad entry in directory #%llu: %s - " |
| "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n", |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg, |
| offset, (unsigned long long)le64_to_cpu(de->inode), rlen, |
| de->name_len); |
| |
| return error_msg == NULL ? 1 : 0; |
| } |
| |
| static inline int ocfs2_match(int len, |
| const char * const name, |
| struct ocfs2_dir_entry *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 ocfs2_search_dirblock(struct buffer_head *bh, |
| struct inode *dir, |
| const char *name, int namelen, |
| unsigned long offset, |
| char *first_de, |
| unsigned int bytes, |
| struct ocfs2_dir_entry **res_dir) |
| { |
| struct ocfs2_dir_entry *de; |
| char *dlimit, *de_buf; |
| int de_len; |
| int ret = 0; |
| |
| de_buf = first_de; |
| dlimit = de_buf + bytes; |
| |
| while (de_buf < dlimit) { |
| /* this code is executed quadratically often */ |
| /* do minimal checking `by hand' */ |
| |
| de = (struct ocfs2_dir_entry *) de_buf; |
| |
| if (de_buf + namelen <= dlimit && |
| ocfs2_match(namelen, name, de)) { |
| /* found a match - just to be sure, do a full check */ |
| if (!ocfs2_check_dir_entry(dir, de, bh, offset)) { |
| ret = -1; |
| goto bail; |
| } |
| *res_dir = de; |
| ret = 1; |
| goto bail; |
| } |
| |
| /* prevent looping on a bad block */ |
| de_len = le16_to_cpu(de->rec_len); |
| if (de_len <= 0) { |
| ret = -1; |
| goto bail; |
| } |
| |
| de_buf += de_len; |
| offset += de_len; |
| } |
| |
| bail: |
| trace_ocfs2_search_dirblock(ret); |
| return ret; |
| } |
| |
| static struct buffer_head *ocfs2_find_entry_id(const char *name, |
| int namelen, |
| struct inode *dir, |
| struct ocfs2_dir_entry **res_dir) |
| { |
| int ret, found; |
| struct buffer_head *di_bh = NULL; |
| struct ocfs2_dinode *di; |
| struct ocfs2_inline_data *data; |
| |
| ret = ocfs2_read_inode_block(dir, &di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| di = (struct ocfs2_dinode *)di_bh->b_data; |
| data = &di->id2.i_data; |
| |
| found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0, |
| data->id_data, i_size_read(dir), res_dir); |
| if (found == 1) |
| return di_bh; |
| |
| brelse(di_bh); |
| out: |
| return NULL; |
| } |
| |
| static int ocfs2_validate_dir_block(struct super_block *sb, |
| struct buffer_head *bh) |
| { |
| int rc; |
| struct ocfs2_dir_block_trailer *trailer = |
| ocfs2_trailer_from_bh(bh, sb); |
| |
| |
| /* |
| * We don't validate dirents here, that's handled |
| * in-place when the code walks them. |
| */ |
| trace_ocfs2_validate_dir_block((unsigned long long)bh->b_blocknr); |
| |
| BUG_ON(!buffer_uptodate(bh)); |
| |
| /* |
| * If the ecc fails, we return the error but otherwise |
| * leave the filesystem running. We know any error is |
| * local to this block. |
| * |
| * Note that we are safe to call this even if the directory |
| * doesn't have a trailer. Filesystems without metaecc will do |
| * nothing, and filesystems with it will have one. |
| */ |
| rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &trailer->db_check); |
| if (rc) |
| mlog(ML_ERROR, "Checksum failed for dinode %llu\n", |
| (unsigned long long)bh->b_blocknr); |
| |
| return rc; |
| } |
| |
| /* |
| * Validate a directory trailer. |
| * |
| * We check the trailer here rather than in ocfs2_validate_dir_block() |
| * because that function doesn't have the inode to test. |
| */ |
| static int ocfs2_check_dir_trailer(struct inode *dir, struct buffer_head *bh) |
| { |
| int rc = 0; |
| struct ocfs2_dir_block_trailer *trailer; |
| |
| trailer = ocfs2_trailer_from_bh(bh, dir->i_sb); |
| if (!OCFS2_IS_VALID_DIR_TRAILER(trailer)) { |
| rc = ocfs2_error(dir->i_sb, |
| "Invalid dirblock #%llu: signature = %.*s\n", |
| (unsigned long long)bh->b_blocknr, 7, |
| trailer->db_signature); |
| goto out; |
| } |
| if (le64_to_cpu(trailer->db_blkno) != bh->b_blocknr) { |
| rc = ocfs2_error(dir->i_sb, |
| "Directory block #%llu has an invalid db_blkno of %llu\n", |
| (unsigned long long)bh->b_blocknr, |
| (unsigned long long)le64_to_cpu(trailer->db_blkno)); |
| goto out; |
| } |
| if (le64_to_cpu(trailer->db_parent_dinode) != |
| OCFS2_I(dir)->ip_blkno) { |
| rc = ocfs2_error(dir->i_sb, |
| "Directory block #%llu on dinode #%llu has an invalid parent_dinode of %llu\n", |
| (unsigned long long)bh->b_blocknr, |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, |
| (unsigned long long)le64_to_cpu(trailer->db_blkno)); |
| goto out; |
| } |
| out: |
| return rc; |
| } |
| |
| /* |
| * This function forces all errors to -EIO for consistency with its |
| * predecessor, ocfs2_bread(). We haven't audited what returning the |
| * real error codes would do to callers. We log the real codes with |
| * mlog_errno() before we squash them. |
| */ |
| static int ocfs2_read_dir_block(struct inode *inode, u64 v_block, |
| struct buffer_head **bh, int flags) |
| { |
| int rc = 0; |
| struct buffer_head *tmp = *bh; |
| |
| rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, flags, |
| ocfs2_validate_dir_block); |
| if (rc) { |
| mlog_errno(rc); |
| goto out; |
| } |
| |
| if (!(flags & OCFS2_BH_READAHEAD) && |
| ocfs2_supports_dir_trailer(inode)) { |
| rc = ocfs2_check_dir_trailer(inode, tmp); |
| if (rc) { |
| if (!*bh) |
| brelse(tmp); |
| mlog_errno(rc); |
| goto out; |
| } |
| } |
| |
| /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */ |
| if (!*bh) |
| *bh = tmp; |
| |
| out: |
| return rc ? -EIO : 0; |
| } |
| |
| /* |
| * Read the block at 'phys' which belongs to this directory |
| * inode. This function does no virtual->physical block translation - |
| * what's passed in is assumed to be a valid directory block. |
| */ |
| static int ocfs2_read_dir_block_direct(struct inode *dir, u64 phys, |
| struct buffer_head **bh) |
| { |
| int ret; |
| struct buffer_head *tmp = *bh; |
| |
| ret = ocfs2_read_block(INODE_CACHE(dir), phys, &tmp, |
| ocfs2_validate_dir_block); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| if (ocfs2_supports_dir_trailer(dir)) { |
| ret = ocfs2_check_dir_trailer(dir, tmp); |
| if (ret) { |
| if (!*bh) |
| brelse(tmp); |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| if (!ret && !*bh) |
| *bh = tmp; |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_validate_dx_root(struct super_block *sb, |
| struct buffer_head *bh) |
| { |
| int ret; |
| struct ocfs2_dx_root_block *dx_root; |
| |
| BUG_ON(!buffer_uptodate(bh)); |
| |
| dx_root = (struct ocfs2_dx_root_block *) bh->b_data; |
| |
| ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_root->dr_check); |
| if (ret) { |
| mlog(ML_ERROR, |
| "Checksum failed for dir index root block %llu\n", |
| (unsigned long long)bh->b_blocknr); |
| return ret; |
| } |
| |
| if (!OCFS2_IS_VALID_DX_ROOT(dx_root)) { |
| ret = ocfs2_error(sb, |
| "Dir Index Root # %llu has bad signature %.*s\n", |
| (unsigned long long)le64_to_cpu(dx_root->dr_blkno), |
| 7, dx_root->dr_signature); |
| } |
| |
| return ret; |
| } |
| |
| static int ocfs2_read_dx_root(struct inode *dir, struct ocfs2_dinode *di, |
| struct buffer_head **dx_root_bh) |
| { |
| int ret; |
| u64 blkno = le64_to_cpu(di->i_dx_root); |
| struct buffer_head *tmp = *dx_root_bh; |
| |
| ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp, |
| ocfs2_validate_dx_root); |
| |
| /* If ocfs2_read_block() got us a new bh, pass it up. */ |
| if (!ret && !*dx_root_bh) |
| *dx_root_bh = tmp; |
| |
| return ret; |
| } |
| |
| static int ocfs2_validate_dx_leaf(struct super_block *sb, |
| struct buffer_head *bh) |
| { |
| int ret; |
| struct ocfs2_dx_leaf *dx_leaf = (struct ocfs2_dx_leaf *)bh->b_data; |
| |
| BUG_ON(!buffer_uptodate(bh)); |
| |
| ret = ocfs2_validate_meta_ecc(sb, bh->b_data, &dx_leaf->dl_check); |
| if (ret) { |
| mlog(ML_ERROR, |
| "Checksum failed for dir index leaf block %llu\n", |
| (unsigned long long)bh->b_blocknr); |
| return ret; |
| } |
| |
| if (!OCFS2_IS_VALID_DX_LEAF(dx_leaf)) { |
| ret = ocfs2_error(sb, "Dir Index Leaf has bad signature %.*s\n", |
| 7, dx_leaf->dl_signature); |
| } |
| |
| return ret; |
| } |
| |
| static int ocfs2_read_dx_leaf(struct inode *dir, u64 blkno, |
| struct buffer_head **dx_leaf_bh) |
| { |
| int ret; |
| struct buffer_head *tmp = *dx_leaf_bh; |
| |
| ret = ocfs2_read_block(INODE_CACHE(dir), blkno, &tmp, |
| ocfs2_validate_dx_leaf); |
| |
| /* If ocfs2_read_block() got us a new bh, pass it up. */ |
| if (!ret && !*dx_leaf_bh) |
| *dx_leaf_bh = tmp; |
| |
| return ret; |
| } |
| |
| /* |
| * Read a series of dx_leaf blocks. This expects all buffer_head |
| * pointers to be NULL on function entry. |
| */ |
| static int ocfs2_read_dx_leaves(struct inode *dir, u64 start, int num, |
| struct buffer_head **dx_leaf_bhs) |
| { |
| int ret; |
| |
| ret = ocfs2_read_blocks(INODE_CACHE(dir), start, num, dx_leaf_bhs, 0, |
| ocfs2_validate_dx_leaf); |
| if (ret) |
| mlog_errno(ret); |
| |
| return ret; |
| } |
| |
| static struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen, |
| struct inode *dir, |
| struct ocfs2_dir_entry **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; |
| 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; |
| |
| sb = dir->i_sb; |
| |
| nblocks = i_size_read(dir) >> sb->s_blocksize_bits; |
| start = OCFS2_I(dir)->ip_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 = NULL; |
| ocfs2_read_dir_block(dir, b++, &bh, |
| OCFS2_BH_READAHEAD); |
| bh_use[ra_max] = bh; |
| } |
| } |
| if ((bh = bh_use[ra_ptr++]) == NULL) |
| goto next; |
| if (ocfs2_read_dir_block(dir, block, &bh, 0)) { |
| /* read error, skip block & hope for the best. |
| * ocfs2_read_dir_block() has released the bh. */ |
| mlog(ML_ERROR, "reading directory %llu, " |
| "offset %lu\n", |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, |
| block); |
| goto next; |
| } |
| i = ocfs2_search_dirblock(bh, dir, name, namelen, |
| block << sb->s_blocksize_bits, |
| bh->b_data, sb->s_blocksize, |
| res_dir); |
| if (i == 1) { |
| OCFS2_I(dir)->ip_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 = i_size_read(dir) >> sb->s_blocksize_bits; |
| 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]); |
| |
| trace_ocfs2_find_entry_el(ret); |
| return ret; |
| } |
| |
| static int ocfs2_dx_dir_lookup_rec(struct inode *inode, |
| struct ocfs2_extent_list *el, |
| u32 major_hash, |
| u32 *ret_cpos, |
| u64 *ret_phys_blkno, |
| unsigned int *ret_clen) |
| { |
| int ret = 0, i, found; |
| struct buffer_head *eb_bh = NULL; |
| struct ocfs2_extent_block *eb; |
| struct ocfs2_extent_rec *rec = NULL; |
| |
| if (el->l_tree_depth) { |
| ret = ocfs2_find_leaf(INODE_CACHE(inode), el, major_hash, |
| &eb_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| eb = (struct ocfs2_extent_block *) eb_bh->b_data; |
| el = &eb->h_list; |
| |
| if (el->l_tree_depth) { |
| ret = ocfs2_error(inode->i_sb, |
| "Inode %lu has non zero tree depth in btree tree block %llu\n", |
| inode->i_ino, |
| (unsigned long long)eb_bh->b_blocknr); |
| goto out; |
| } |
| } |
| |
| found = 0; |
| for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) { |
| rec = &el->l_recs[i]; |
| |
| if (le32_to_cpu(rec->e_cpos) <= major_hash) { |
| found = 1; |
| break; |
| } |
| } |
| |
| if (!found) { |
| ret = ocfs2_error(inode->i_sb, |
| "Inode %lu has bad extent record (%u, %u, 0) in btree\n", |
| inode->i_ino, |
| le32_to_cpu(rec->e_cpos), |
| ocfs2_rec_clusters(el, rec)); |
| goto out; |
| } |
| |
| if (ret_phys_blkno) |
| *ret_phys_blkno = le64_to_cpu(rec->e_blkno); |
| if (ret_cpos) |
| *ret_cpos = le32_to_cpu(rec->e_cpos); |
| if (ret_clen) |
| *ret_clen = le16_to_cpu(rec->e_leaf_clusters); |
| |
| out: |
| brelse(eb_bh); |
| return ret; |
| } |
| |
| /* |
| * Returns the block index, from the start of the cluster which this |
| * hash belongs too. |
| */ |
| static inline unsigned int __ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb, |
| u32 minor_hash) |
| { |
| return minor_hash & osb->osb_dx_mask; |
| } |
| |
| static inline unsigned int ocfs2_dx_dir_hash_idx(struct ocfs2_super *osb, |
| struct ocfs2_dx_hinfo *hinfo) |
| { |
| return __ocfs2_dx_dir_hash_idx(osb, hinfo->minor_hash); |
| } |
| |
| static int ocfs2_dx_dir_lookup(struct inode *inode, |
| struct ocfs2_extent_list *el, |
| struct ocfs2_dx_hinfo *hinfo, |
| u32 *ret_cpos, |
| u64 *ret_phys_blkno) |
| { |
| int ret = 0; |
| unsigned int cend, clen; |
| u32 cpos; |
| u64 blkno; |
| u32 name_hash = hinfo->major_hash; |
| |
| ret = ocfs2_dx_dir_lookup_rec(inode, el, name_hash, &cpos, &blkno, |
| &clen); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| cend = cpos + clen; |
| if (name_hash >= cend) { |
| /* We want the last cluster */ |
| blkno += ocfs2_clusters_to_blocks(inode->i_sb, clen - 1); |
| cpos += clen - 1; |
| } else { |
| blkno += ocfs2_clusters_to_blocks(inode->i_sb, |
| name_hash - cpos); |
| cpos = name_hash; |
| } |
| |
| /* |
| * We now have the cluster which should hold our entry. To |
| * find the exact block from the start of the cluster to |
| * search, we take the lower bits of the hash. |
| */ |
| blkno += ocfs2_dx_dir_hash_idx(OCFS2_SB(inode->i_sb), hinfo); |
| |
| if (ret_phys_blkno) |
| *ret_phys_blkno = blkno; |
| if (ret_cpos) |
| *ret_cpos = cpos; |
| |
| out: |
| |
| return ret; |
| } |
| |
| static int ocfs2_dx_dir_search(const char *name, int namelen, |
| struct inode *dir, |
| struct ocfs2_dx_root_block *dx_root, |
| struct ocfs2_dir_lookup_result *res) |
| { |
| int ret, i, found; |
| u64 phys; |
| struct buffer_head *dx_leaf_bh = NULL; |
| struct ocfs2_dx_leaf *dx_leaf; |
| struct ocfs2_dx_entry *dx_entry = NULL; |
| struct buffer_head *dir_ent_bh = NULL; |
| struct ocfs2_dir_entry *dir_ent = NULL; |
| struct ocfs2_dx_hinfo *hinfo = &res->dl_hinfo; |
| struct ocfs2_extent_list *dr_el; |
| struct ocfs2_dx_entry_list *entry_list; |
| |
| ocfs2_dx_dir_name_hash(dir, name, namelen, &res->dl_hinfo); |
| |
| if (ocfs2_dx_root_inline(dx_root)) { |
| entry_list = &dx_root->dr_entries; |
| goto search; |
| } |
| |
| dr_el = &dx_root->dr_list; |
| |
| ret = ocfs2_dx_dir_lookup(dir, dr_el, hinfo, NULL, &phys); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| trace_ocfs2_dx_dir_search((unsigned long long)OCFS2_I(dir)->ip_blkno, |
| namelen, name, hinfo->major_hash, |
| hinfo->minor_hash, (unsigned long long)phys); |
| |
| ret = ocfs2_read_dx_leaf(dir, phys, &dx_leaf_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| dx_leaf = (struct ocfs2_dx_leaf *) dx_leaf_bh->b_data; |
| |
| trace_ocfs2_dx_dir_search_leaf_info( |
| le16_to_cpu(dx_leaf->dl_list.de_num_used), |
| le16_to_cpu(dx_leaf->dl_list.de_count)); |
| |
| entry_list = &dx_leaf->dl_list; |
| |
| search: |
| /* |
| * Empty leaf is legal, so no need to check for that. |
| */ |
| found = 0; |
| for (i = 0; i < le16_to_cpu(entry_list->de_num_used); i++) { |
| dx_entry = &entry_list->de_entries[i]; |
| |
| if (hinfo->major_hash != le32_to_cpu(dx_entry->dx_major_hash) |
| || hinfo->minor_hash != le32_to_cpu(dx_entry->dx_minor_hash)) |
| continue; |
| |
| /* |
| * Search unindexed leaf block now. We're not |
| * guaranteed to find anything. |
| */ |
| ret = ocfs2_read_dir_block_direct(dir, |
| le64_to_cpu(dx_entry->dx_dirent_blk), |
| &dir_ent_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * XXX: We should check the unindexed block here, |
| * before using it. |
| */ |
| |
| found = ocfs2_search_dirblock(dir_ent_bh, dir, name, namelen, |
| 0, dir_ent_bh->b_data, |
| dir->i_sb->s_blocksize, &dir_ent); |
| if (found == 1) |
| break; |
| |
| if (found == -1) { |
| /* This means we found a bad directory entry. */ |
| ret = -EIO; |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| brelse(dir_ent_bh); |
| dir_ent_bh = NULL; |
| } |
| |
| if (found <= 0) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| res->dl_leaf_bh = dir_ent_bh; |
| res->dl_entry = dir_ent; |
| res->dl_dx_leaf_bh = dx_leaf_bh; |
| res->dl_dx_entry = dx_entry; |
| |
| ret = 0; |
| out: |
| if (ret) { |
| brelse(dx_leaf_bh); |
| brelse(dir_ent_bh); |
| } |
| return ret; |
| } |
| |
| static int ocfs2_find_entry_dx(const char *name, int namelen, |
| struct inode *dir, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| int ret; |
| struct buffer_head *di_bh = NULL; |
| struct ocfs2_dinode *di; |
| struct buffer_head *dx_root_bh = NULL; |
| struct ocfs2_dx_root_block *dx_root; |
| |
| ret = ocfs2_read_inode_block(dir, &di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| di = (struct ocfs2_dinode *)di_bh->b_data; |
| |
| ret = ocfs2_read_dx_root(dir, di, &dx_root_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| dx_root = (struct ocfs2_dx_root_block *) dx_root_bh->b_data; |
| |
| ret = ocfs2_dx_dir_search(name, namelen, dir, dx_root, lookup); |
| if (ret) { |
| if (ret != -ENOENT) |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| lookup->dl_dx_root_bh = dx_root_bh; |
| dx_root_bh = NULL; |
| out: |
| brelse(di_bh); |
| brelse(dx_root_bh); |
| return ret; |
| } |
| |
| /* |
| * Try to find an entry of the provided name within 'dir'. |
| * |
| * If nothing was found, -ENOENT is returned. Otherwise, zero is |
| * returned and the struct 'res' will contain information useful to |
| * other directory manipulation functions. |
| * |
| * Caller can NOT assume anything about the contents of the |
| * buffer_heads - they are passed back only so that it can be passed |
| * into any one of the manipulation functions (add entry, delete |
| * entry, etc). As an example, bh in the extent directory case is a |
| * data block, in the inline-data case it actually points to an inode, |
| * in the indexed directory case, multiple buffers are involved. |
| */ |
| int ocfs2_find_entry(const char *name, int namelen, |
| struct inode *dir, struct ocfs2_dir_lookup_result *lookup) |
| { |
| struct buffer_head *bh; |
| struct ocfs2_dir_entry *res_dir = NULL; |
| |
| if (ocfs2_dir_indexed(dir)) |
| return ocfs2_find_entry_dx(name, namelen, dir, lookup); |
| |
| /* |
| * The unindexed dir code only uses part of the lookup |
| * structure, so there's no reason to push it down further |
| * than this. |
| */ |
| if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| bh = ocfs2_find_entry_id(name, namelen, dir, &res_dir); |
| else |
| bh = ocfs2_find_entry_el(name, namelen, dir, &res_dir); |
| |
| if (bh == NULL) |
| return -ENOENT; |
| |
| lookup->dl_leaf_bh = bh; |
| lookup->dl_entry = res_dir; |
| return 0; |
| } |
| |
| /* |
| * Update inode number and type of a previously found directory entry. |
| */ |
| int ocfs2_update_entry(struct inode *dir, handle_t *handle, |
| struct ocfs2_dir_lookup_result *res, |
| struct inode *new_entry_inode) |
| { |
| int ret; |
| ocfs2_journal_access_func access = ocfs2_journal_access_db; |
| struct ocfs2_dir_entry *de = res->dl_entry; |
| struct buffer_head *de_bh = res->dl_leaf_bh; |
| |
| /* |
| * The same code works fine for both inline-data and extent |
| * based directories, so no need to split this up. The only |
| * difference is the journal_access function. |
| */ |
| |
| if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| access = ocfs2_journal_access_di; |
| |
| ret = access(handle, INODE_CACHE(dir), de_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno); |
| ocfs2_set_de_type(de, new_entry_inode->i_mode); |
| |
| ocfs2_journal_dirty(handle, de_bh); |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * __ocfs2_delete_entry deletes a directory entry by merging it with the |
| * previous entry |
| */ |
| static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir, |
| struct ocfs2_dir_entry *de_del, |
| struct buffer_head *bh, char *first_de, |
| unsigned int bytes) |
| { |
| struct ocfs2_dir_entry *de, *pde; |
| int i, status = -ENOENT; |
| ocfs2_journal_access_func access = ocfs2_journal_access_db; |
| |
| if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| access = ocfs2_journal_access_di; |
| |
| i = 0; |
| pde = NULL; |
| de = (struct ocfs2_dir_entry *) first_de; |
| while (i < bytes) { |
| if (!ocfs2_check_dir_entry(dir, de, bh, i)) { |
| status = -EIO; |
| mlog_errno(status); |
| goto bail; |
| } |
| if (de == de_del) { |
| status = access(handle, INODE_CACHE(dir), bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (status < 0) { |
| status = -EIO; |
| mlog_errno(status); |
| goto bail; |
| } |
| if (pde) |
| le16_add_cpu(&pde->rec_len, |
| le16_to_cpu(de->rec_len)); |
| de->inode = 0; |
| inode_inc_iversion(dir); |
| ocfs2_journal_dirty(handle, bh); |
| goto bail; |
| } |
| i += le16_to_cpu(de->rec_len); |
| pde = de; |
| de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len)); |
| } |
| bail: |
| return status; |
| } |
| |
| static unsigned int ocfs2_figure_dirent_hole(struct ocfs2_dir_entry *de) |
| { |
| unsigned int hole; |
| |
| if (le64_to_cpu(de->inode) == 0) |
| hole = le16_to_cpu(de->rec_len); |
| else |
| hole = le16_to_cpu(de->rec_len) - |
| OCFS2_DIR_REC_LEN(de->name_len); |
| |
| return hole; |
| } |
| |
| static int ocfs2_find_max_rec_len(struct super_block *sb, |
| struct buffer_head *dirblock_bh) |
| { |
| int size, this_hole, largest_hole = 0; |
| char *trailer, *de_buf, *limit, *start = dirblock_bh->b_data; |
| struct ocfs2_dir_entry *de; |
| |
| trailer = (char *)ocfs2_trailer_from_bh(dirblock_bh, sb); |
| size = ocfs2_dir_trailer_blk_off(sb); |
| limit = start + size; |
| de_buf = start; |
| de = (struct ocfs2_dir_entry *)de_buf; |
| do { |
| if (de_buf != trailer) { |
| this_hole = ocfs2_figure_dirent_hole(de); |
| if (this_hole > largest_hole) |
| largest_hole = this_hole; |
| } |
| |
| de_buf += le16_to_cpu(de->rec_len); |
| de = (struct ocfs2_dir_entry *)de_buf; |
| } while (de_buf < limit); |
| |
| if (largest_hole >= OCFS2_DIR_MIN_REC_LEN) |
| return largest_hole; |
| return 0; |
| } |
| |
| static void ocfs2_dx_list_remove_entry(struct ocfs2_dx_entry_list *entry_list, |
| int index) |
| { |
| int num_used = le16_to_cpu(entry_list->de_num_used); |
| |
| if (num_used == 1 || index == (num_used - 1)) |
| goto clear; |
| |
| memmove(&entry_list->de_entries[index], |
| &entry_list->de_entries[index + 1], |
| (num_used - index - 1)*sizeof(struct ocfs2_dx_entry)); |
| clear: |
| num_used--; |
| memset(&entry_list->de_entries[num_used], 0, |
| sizeof(struct ocfs2_dx_entry)); |
| entry_list->de_num_used = cpu_to_le16(num_used); |
| } |
| |
| static int ocfs2_delete_entry_dx(handle_t *handle, struct inode *dir, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| int ret, index, max_rec_len, add_to_free_list = 0; |
| struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh; |
| struct buffer_head *leaf_bh = lookup->dl_leaf_bh; |
| struct ocfs2_dx_leaf *dx_leaf; |
| struct ocfs2_dx_entry *dx_entry = lookup->dl_dx_entry; |
| struct ocfs2_dir_block_trailer *trailer; |
| struct ocfs2_dx_root_block *dx_root; |
| struct ocfs2_dx_entry_list *entry_list; |
| |
| /* |
| * This function gets a bit messy because we might have to |
| * modify the root block, regardless of whether the indexed |
| * entries are stored inline. |
| */ |
| |
| /* |
| * *Only* set 'entry_list' here, based on where we're looking |
| * for the indexed entries. Later, we might still want to |
| * journal both blocks, based on free list state. |
| */ |
| dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; |
| if (ocfs2_dx_root_inline(dx_root)) { |
| entry_list = &dx_root->dr_entries; |
| } else { |
| dx_leaf = (struct ocfs2_dx_leaf *) lookup->dl_dx_leaf_bh->b_data; |
| entry_list = &dx_leaf->dl_list; |
| } |
| |
| /* Neither of these are a disk corruption - that should have |
| * been caught by lookup, before we got here. */ |
| BUG_ON(le16_to_cpu(entry_list->de_count) <= 0); |
| BUG_ON(le16_to_cpu(entry_list->de_num_used) <= 0); |
| |
| index = (char *)dx_entry - (char *)entry_list->de_entries; |
| index /= sizeof(*dx_entry); |
| |
| if (index >= le16_to_cpu(entry_list->de_num_used)) { |
| mlog(ML_ERROR, "Dir %llu: Bad dx_entry ptr idx %d, (%p, %p)\n", |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, index, |
| entry_list, dx_entry); |
| return -EIO; |
| } |
| |
| /* |
| * We know that removal of this dirent will leave enough room |
| * for a new one, so add this block to the free list if it |
| * isn't already there. |
| */ |
| trailer = ocfs2_trailer_from_bh(leaf_bh, dir->i_sb); |
| if (trailer->db_free_rec_len == 0) |
| add_to_free_list = 1; |
| |
| /* |
| * Add the block holding our index into the journal before |
| * removing the unindexed entry. If we get an error return |
| * from __ocfs2_delete_entry(), then it hasn't removed the |
| * entry yet. Likewise, successful return means we *must* |
| * remove the indexed entry. |
| * |
| * We're also careful to journal the root tree block here as |
| * the entry count needs to be updated. Also, we might be |
| * adding to the start of the free list. |
| */ |
| ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| if (!ocfs2_dx_root_inline(dx_root)) { |
| ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), |
| lookup->dl_dx_leaf_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| trace_ocfs2_delete_entry_dx((unsigned long long)OCFS2_I(dir)->ip_blkno, |
| index); |
| |
| ret = __ocfs2_delete_entry(handle, dir, lookup->dl_entry, |
| leaf_bh, leaf_bh->b_data, leaf_bh->b_size); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, leaf_bh); |
| trailer->db_free_rec_len = cpu_to_le16(max_rec_len); |
| if (add_to_free_list) { |
| trailer->db_free_next = dx_root->dr_free_blk; |
| dx_root->dr_free_blk = cpu_to_le64(leaf_bh->b_blocknr); |
| ocfs2_journal_dirty(handle, dx_root_bh); |
| } |
| |
| /* leaf_bh was journal_accessed for us in __ocfs2_delete_entry */ |
| ocfs2_journal_dirty(handle, leaf_bh); |
| |
| le32_add_cpu(&dx_root->dr_num_entries, -1); |
| ocfs2_journal_dirty(handle, dx_root_bh); |
| |
| ocfs2_dx_list_remove_entry(entry_list, index); |
| |
| if (!ocfs2_dx_root_inline(dx_root)) |
| ocfs2_journal_dirty(handle, lookup->dl_dx_leaf_bh); |
| |
| out: |
| return ret; |
| } |
| |
| static inline int ocfs2_delete_entry_id(handle_t *handle, |
| struct inode *dir, |
| struct ocfs2_dir_entry *de_del, |
| struct buffer_head *bh) |
| { |
| int ret; |
| struct buffer_head *di_bh = NULL; |
| struct ocfs2_dinode *di; |
| struct ocfs2_inline_data *data; |
| |
| ret = ocfs2_read_inode_block(dir, &di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| di = (struct ocfs2_dinode *)di_bh->b_data; |
| data = &di->id2.i_data; |
| |
| ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data, |
| i_size_read(dir)); |
| |
| brelse(di_bh); |
| out: |
| return ret; |
| } |
| |
| static inline int ocfs2_delete_entry_el(handle_t *handle, |
| struct inode *dir, |
| struct ocfs2_dir_entry *de_del, |
| struct buffer_head *bh) |
| { |
| return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data, |
| bh->b_size); |
| } |
| |
| /* |
| * Delete a directory entry. Hide the details of directory |
| * implementation from the caller. |
| */ |
| int ocfs2_delete_entry(handle_t *handle, |
| struct inode *dir, |
| struct ocfs2_dir_lookup_result *res) |
| { |
| if (ocfs2_dir_indexed(dir)) |
| return ocfs2_delete_entry_dx(handle, dir, res); |
| |
| if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| return ocfs2_delete_entry_id(handle, dir, res->dl_entry, |
| res->dl_leaf_bh); |
| |
| return ocfs2_delete_entry_el(handle, dir, res->dl_entry, |
| res->dl_leaf_bh); |
| } |
| |
| /* |
| * Check whether 'de' has enough room to hold an entry of |
| * 'new_rec_len' bytes. |
| */ |
| static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de, |
| unsigned int new_rec_len) |
| { |
| unsigned int de_really_used; |
| |
| /* Check whether this is an empty record with enough space */ |
| if (le64_to_cpu(de->inode) == 0 && |
| le16_to_cpu(de->rec_len) >= new_rec_len) |
| return 1; |
| |
| /* |
| * Record might have free space at the end which we can |
| * use. |
| */ |
| de_really_used = OCFS2_DIR_REC_LEN(de->name_len); |
| if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len)) |
| return 1; |
| |
| return 0; |
| } |
| |
| static void ocfs2_dx_dir_leaf_insert_tail(struct ocfs2_dx_leaf *dx_leaf, |
| struct ocfs2_dx_entry *dx_new_entry) |
| { |
| int i; |
| |
| i = le16_to_cpu(dx_leaf->dl_list.de_num_used); |
| dx_leaf->dl_list.de_entries[i] = *dx_new_entry; |
| |
| le16_add_cpu(&dx_leaf->dl_list.de_num_used, 1); |
| } |
| |
| static void ocfs2_dx_entry_list_insert(struct ocfs2_dx_entry_list *entry_list, |
| struct ocfs2_dx_hinfo *hinfo, |
| u64 dirent_blk) |
| { |
| int i; |
| struct ocfs2_dx_entry *dx_entry; |
| |
| i = le16_to_cpu(entry_list->de_num_used); |
| dx_entry = &entry_list->de_entries[i]; |
| |
| memset(dx_entry, 0, sizeof(*dx_entry)); |
| dx_entry->dx_major_hash = cpu_to_le32(hinfo->major_hash); |
| dx_entry->dx_minor_hash = cpu_to_le32(hinfo->minor_hash); |
| dx_entry->dx_dirent_blk = cpu_to_le64(dirent_blk); |
| |
| le16_add_cpu(&entry_list->de_num_used, 1); |
| } |
| |
| static int __ocfs2_dx_dir_leaf_insert(struct inode *dir, handle_t *handle, |
| struct ocfs2_dx_hinfo *hinfo, |
| u64 dirent_blk, |
| struct buffer_head *dx_leaf_bh) |
| { |
| int ret; |
| struct ocfs2_dx_leaf *dx_leaf; |
| |
| ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), dx_leaf_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| dx_leaf = (struct ocfs2_dx_leaf *)dx_leaf_bh->b_data; |
| ocfs2_dx_entry_list_insert(&dx_leaf->dl_list, hinfo, dirent_blk); |
| ocfs2_journal_dirty(handle, dx_leaf_bh); |
| |
| out: |
| return ret; |
| } |
| |
| static void ocfs2_dx_inline_root_insert(struct inode *dir, handle_t *handle, |
| struct ocfs2_dx_hinfo *hinfo, |
| u64 dirent_blk, |
| struct ocfs2_dx_root_block *dx_root) |
| { |
| ocfs2_dx_entry_list_insert(&dx_root->dr_entries, hinfo, dirent_blk); |
| } |
| |
| static int ocfs2_dx_dir_insert(struct inode *dir, handle_t *handle, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| int ret = 0; |
| struct ocfs2_dx_root_block *dx_root; |
| struct buffer_head *dx_root_bh = lookup->dl_dx_root_bh; |
| |
| ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| dx_root = (struct ocfs2_dx_root_block *)lookup->dl_dx_root_bh->b_data; |
| if (ocfs2_dx_root_inline(dx_root)) { |
| ocfs2_dx_inline_root_insert(dir, handle, |
| &lookup->dl_hinfo, |
| lookup->dl_leaf_bh->b_blocknr, |
| dx_root); |
| } else { |
| ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &lookup->dl_hinfo, |
| lookup->dl_leaf_bh->b_blocknr, |
| lookup->dl_dx_leaf_bh); |
| if (ret) |
| goto out; |
| } |
| |
| le32_add_cpu(&dx_root->dr_num_entries, 1); |
| ocfs2_journal_dirty(handle, dx_root_bh); |
| |
| out: |
| return ret; |
| } |
| |
| static void ocfs2_remove_block_from_free_list(struct inode *dir, |
| handle_t *handle, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| struct ocfs2_dir_block_trailer *trailer, *prev; |
| struct ocfs2_dx_root_block *dx_root; |
| struct buffer_head *bh; |
| |
| trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb); |
| |
| if (ocfs2_free_list_at_root(lookup)) { |
| bh = lookup->dl_dx_root_bh; |
| dx_root = (struct ocfs2_dx_root_block *)bh->b_data; |
| dx_root->dr_free_blk = trailer->db_free_next; |
| } else { |
| bh = lookup->dl_prev_leaf_bh; |
| prev = ocfs2_trailer_from_bh(bh, dir->i_sb); |
| prev->db_free_next = trailer->db_free_next; |
| } |
| |
| trailer->db_free_rec_len = cpu_to_le16(0); |
| trailer->db_free_next = cpu_to_le64(0); |
| |
| ocfs2_journal_dirty(handle, bh); |
| ocfs2_journal_dirty(handle, lookup->dl_leaf_bh); |
| } |
| |
| /* |
| * This expects that a journal write has been reserved on |
| * lookup->dl_prev_leaf_bh or lookup->dl_dx_root_bh |
| */ |
| static void ocfs2_recalc_free_list(struct inode *dir, handle_t *handle, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| int max_rec_len; |
| struct ocfs2_dir_block_trailer *trailer; |
| |
| /* Walk dl_leaf_bh to figure out what the new free rec_len is. */ |
| max_rec_len = ocfs2_find_max_rec_len(dir->i_sb, lookup->dl_leaf_bh); |
| if (max_rec_len) { |
| /* |
| * There's still room in this block, so no need to remove it |
| * from the free list. In this case, we just want to update |
| * the rec len accounting. |
| */ |
| trailer = ocfs2_trailer_from_bh(lookup->dl_leaf_bh, dir->i_sb); |
| trailer->db_free_rec_len = cpu_to_le16(max_rec_len); |
| ocfs2_journal_dirty(handle, lookup->dl_leaf_bh); |
| } else { |
| ocfs2_remove_block_from_free_list(dir, handle, lookup); |
| } |
| } |
| |
| /* we don't always have a dentry for what we want to add, so people |
| * like orphan dir can call this instead. |
| * |
| * The lookup context must have been filled from |
| * ocfs2_prepare_dir_for_insert. |
| */ |
| int __ocfs2_add_entry(handle_t *handle, |
| struct inode *dir, |
| const char *name, int namelen, |
| struct inode *inode, u64 blkno, |
| struct buffer_head *parent_fe_bh, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| unsigned long offset; |
| unsigned short rec_len; |
| struct ocfs2_dir_entry *de, *de1; |
| struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data; |
| struct super_block *sb = dir->i_sb; |
| int retval; |
| unsigned int size = sb->s_blocksize; |
| struct buffer_head *insert_bh = lookup->dl_leaf_bh; |
| char *data_start = insert_bh->b_data; |
| |
| if (!namelen) |
| return -EINVAL; |
| |
| if (ocfs2_dir_indexed(dir)) { |
| struct buffer_head *bh; |
| |
| /* |
| * An indexed dir may require that we update the free space |
| * list. Reserve a write to the previous node in the list so |
| * that we don't fail later. |
| * |
| * XXX: This can be either a dx_root_block, or an unindexed |
| * directory tree leaf block. |
| */ |
| if (ocfs2_free_list_at_root(lookup)) { |
| bh = lookup->dl_dx_root_bh; |
| retval = ocfs2_journal_access_dr(handle, |
| INODE_CACHE(dir), bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| } else { |
| bh = lookup->dl_prev_leaf_bh; |
| retval = ocfs2_journal_access_db(handle, |
| INODE_CACHE(dir), bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| } |
| if (retval) { |
| mlog_errno(retval); |
| return retval; |
| } |
| } else if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) { |
| data_start = di->id2.i_data.id_data; |
| size = i_size_read(dir); |
| |
| BUG_ON(insert_bh != parent_fe_bh); |
| } |
| |
| rec_len = OCFS2_DIR_REC_LEN(namelen); |
| offset = 0; |
| de = (struct ocfs2_dir_entry *) data_start; |
| while (1) { |
| BUG_ON((char *)de >= (size + data_start)); |
| |
| /* These checks should've already been passed by the |
| * prepare function, but I guess we can leave them |
| * here anyway. */ |
| if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) { |
| retval = -ENOENT; |
| goto bail; |
| } |
| if (ocfs2_match(namelen, name, de)) { |
| retval = -EEXIST; |
| goto bail; |
| } |
| |
| /* We're guaranteed that we should have space, so we |
| * can't possibly have hit the trailer...right? */ |
| mlog_bug_on_msg(ocfs2_skip_dir_trailer(dir, de, offset, size), |
| "Hit dir trailer trying to insert %.*s " |
| "(namelen %d) into directory %llu. " |
| "offset is %lu, trailer offset is %d\n", |
| namelen, name, namelen, |
| (unsigned long long)parent_fe_bh->b_blocknr, |
| offset, ocfs2_dir_trailer_blk_off(dir->i_sb)); |
| |
| if (ocfs2_dirent_would_fit(de, rec_len)) { |
| dir->i_mtime = dir->i_ctime = current_time(dir); |
| retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh); |
| if (retval < 0) { |
| mlog_errno(retval); |
| goto bail; |
| } |
| |
| if (insert_bh == parent_fe_bh) |
| retval = ocfs2_journal_access_di(handle, |
| INODE_CACHE(dir), |
| insert_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| else { |
| retval = ocfs2_journal_access_db(handle, |
| INODE_CACHE(dir), |
| insert_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| |
| if (!retval && ocfs2_dir_indexed(dir)) |
| retval = ocfs2_dx_dir_insert(dir, |
| handle, |
| lookup); |
| } |
| |
| if (retval) { |
| mlog_errno(retval); |
| goto bail; |
| } |
| |
| /* By now the buffer is marked for journaling */ |
| offset += le16_to_cpu(de->rec_len); |
| if (le64_to_cpu(de->inode)) { |
| de1 = (struct ocfs2_dir_entry *)((char *) de + |
| OCFS2_DIR_REC_LEN(de->name_len)); |
| de1->rec_len = |
| cpu_to_le16(le16_to_cpu(de->rec_len) - |
| OCFS2_DIR_REC_LEN(de->name_len)); |
| de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); |
| de = de1; |
| } |
| de->file_type = FT_UNKNOWN; |
| if (blkno) { |
| de->inode = cpu_to_le64(blkno); |
| ocfs2_set_de_type(de, inode->i_mode); |
| } else |
| de->inode = 0; |
| de->name_len = namelen; |
| memcpy(de->name, name, namelen); |
| |
| if (ocfs2_dir_indexed(dir)) |
| ocfs2_recalc_free_list(dir, handle, lookup); |
| |
| inode_inc_iversion(dir); |
| ocfs2_journal_dirty(handle, insert_bh); |
| retval = 0; |
| goto bail; |
| } |
| |
| offset += le16_to_cpu(de->rec_len); |
| de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len)); |
| } |
| |
| /* when you think about it, the assert above should prevent us |
| * from ever getting here. */ |
| retval = -ENOSPC; |
| bail: |
| if (retval) |
| mlog_errno(retval); |
| |
| return retval; |
| } |
| |
| static int ocfs2_dir_foreach_blk_id(struct inode *inode, |
| u64 *f_version, |
| struct dir_context *ctx) |
| { |
| int ret, i; |
| unsigned long offset = ctx->pos; |
| struct buffer_head *di_bh = NULL; |
| struct ocfs2_dinode *di; |
| struct ocfs2_inline_data *data; |
| struct ocfs2_dir_entry *de; |
| |
| ret = ocfs2_read_inode_block(inode, &di_bh); |
| if (ret) { |
| mlog(ML_ERROR, "Unable to read inode block for dir %llu\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| goto out; |
| } |
| |
| di = (struct ocfs2_dinode *)di_bh->b_data; |
| data = &di->id2.i_data; |
| |
| while (ctx->pos < i_size_read(inode)) { |
| /* If the dir block has changed since the last call to |
| * readdir(2), then we might be pointing to an invalid |
| * dirent right now. Scan from the start of the block |
| * to make sure. */ |
| if (!inode_eq_iversion(inode, *f_version)) { |
| for (i = 0; i < i_size_read(inode) && i < offset; ) { |
| de = (struct ocfs2_dir_entry *) |
| (data->id_data + i); |
| /* It's too expensive to do a full |
| * dirent test each time round this |
| * loop, but we do have to test at |
| * least that it is non-zero. A |
| * failure will be detected in the |
| * dirent test below. */ |
| if (le16_to_cpu(de->rec_len) < |
| OCFS2_DIR_REC_LEN(1)) |
| break; |
| i += le16_to_cpu(de->rec_len); |
| } |
| ctx->pos = offset = i; |
| *f_version = inode_query_iversion(inode); |
| } |
| |
| de = (struct ocfs2_dir_entry *) (data->id_data + ctx->pos); |
| if (!ocfs2_check_dir_entry(inode, de, di_bh, ctx->pos)) { |
| /* On error, skip the f_pos to the end. */ |
| ctx->pos = i_size_read(inode); |
| break; |
| } |
| offset += le16_to_cpu(de->rec_len); |
| if (le64_to_cpu(de->inode)) { |
| if (!dir_emit(ctx, de->name, de->name_len, |
| le64_to_cpu(de->inode), |
| fs_ftype_to_dtype(de->file_type))) |
| goto out; |
| } |
| ctx->pos += le16_to_cpu(de->rec_len); |
| } |
| out: |
| brelse(di_bh); |
| return 0; |
| } |
| |
| /* |
| * NOTE: This function can be called against unindexed directories, |
| * and indexed ones. |
| */ |
| static int ocfs2_dir_foreach_blk_el(struct inode *inode, |
| u64 *f_version, |
| struct dir_context *ctx, |
| bool persist) |
| { |
| unsigned long offset, blk, last_ra_blk = 0; |
| int i; |
| struct buffer_head * bh, * tmp; |
| struct ocfs2_dir_entry * de; |
| struct super_block * sb = inode->i_sb; |
| unsigned int ra_sectors = 16; |
| int stored = 0; |
| |
| bh = NULL; |
| |
| offset = ctx->pos & (sb->s_blocksize - 1); |
| |
| while (ctx->pos < i_size_read(inode)) { |
| blk = ctx->pos >> sb->s_blocksize_bits; |
| if (ocfs2_read_dir_block(inode, blk, &bh, 0)) { |
| /* Skip the corrupt dirblock and keep trying */ |
| ctx->pos += sb->s_blocksize - offset; |
| continue; |
| } |
| |
| /* The idea here is to begin with 8k read-ahead and to stay |
| * 4k ahead of our current position. |
| * |
| * TODO: Use the pagecache for this. We just need to |
| * make sure it's cluster-safe... */ |
| if (!last_ra_blk |
| || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) { |
| for (i = ra_sectors >> (sb->s_blocksize_bits - 9); |
| i > 0; i--) { |
| tmp = NULL; |
| if (!ocfs2_read_dir_block(inode, ++blk, &tmp, |
| OCFS2_BH_READAHEAD)) |
| brelse(tmp); |
| } |
| last_ra_blk = blk; |
| ra_sectors = 8; |
| } |
| |
| /* If the dir block has changed since the last call to |
| * readdir(2), then we might be pointing to an invalid |
| * dirent right now. Scan from the start of the block |
| * to make sure. */ |
| if (!inode_eq_iversion(inode, *f_version)) { |
| for (i = 0; i < sb->s_blocksize && i < offset; ) { |
| de = (struct ocfs2_dir_entry *) (bh->b_data + i); |
| /* It's too expensive to do a full |
| * dirent test each time round this |
| * loop, but we do have to test at |
| * least that it is non-zero. A |
| * failure will be detected in the |
| * dirent test below. */ |
| if (le16_to_cpu(de->rec_len) < |
| OCFS2_DIR_REC_LEN(1)) |
| break; |
| i += le16_to_cpu(de->rec_len); |
| } |
| offset = i; |
| ctx->pos = (ctx->pos & ~(sb->s_blocksize - 1)) |
| | offset; |
| *f_version = inode_query_iversion(inode); |
| } |
| |
| while (ctx->pos < i_size_read(inode) |
| && offset < sb->s_blocksize) { |
| de = (struct ocfs2_dir_entry *) (bh->b_data + offset); |
| if (!ocfs2_check_dir_entry(inode, de, bh, offset)) { |
| /* On error, skip the f_pos to the |
| next block. */ |
| ctx->pos = (ctx->pos | (sb->s_blocksize - 1)) + 1; |
| break; |
| } |
| if (le64_to_cpu(de->inode)) { |
| if (!dir_emit(ctx, de->name, |
| de->name_len, |
| le64_to_cpu(de->inode), |
| fs_ftype_to_dtype(de->file_type))) { |
| brelse(bh); |
| return 0; |
| } |
| stored++; |
| } |
| offset += le16_to_cpu(de->rec_len); |
| ctx->pos += le16_to_cpu(de->rec_len); |
| } |
| offset = 0; |
| brelse(bh); |
| bh = NULL; |
| if (!persist && stored) |
| break; |
| } |
| return 0; |
| } |
| |
| static int ocfs2_dir_foreach_blk(struct inode *inode, u64 *f_version, |
| struct dir_context *ctx, |
| bool persist) |
| { |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| return ocfs2_dir_foreach_blk_id(inode, f_version, ctx); |
| return ocfs2_dir_foreach_blk_el(inode, f_version, ctx, persist); |
| } |
| |
| /* |
| * This is intended to be called from inside other kernel functions, |
| * so we fake some arguments. |
| */ |
| int ocfs2_dir_foreach(struct inode *inode, struct dir_context *ctx) |
| { |
| u64 version = inode_query_iversion(inode); |
| ocfs2_dir_foreach_blk(inode, &version, ctx, true); |
| return 0; |
| } |
| |
| /* |
| * ocfs2_readdir() |
| * |
| */ |
| int ocfs2_readdir(struct file *file, struct dir_context *ctx) |
| { |
| int error = 0; |
| struct inode *inode = file_inode(file); |
| int lock_level = 0; |
| |
| trace_ocfs2_readdir((unsigned long long)OCFS2_I(inode)->ip_blkno); |
| |
| error = ocfs2_inode_lock_atime(inode, file->f_path.mnt, &lock_level, 1); |
| if (lock_level && error >= 0) { |
| /* We release EX lock which used to update atime |
| * and get PR lock again to reduce contention |
| * on commonly accessed directories. */ |
| ocfs2_inode_unlock(inode, 1); |
| lock_level = 0; |
| error = ocfs2_inode_lock(inode, NULL, 0); |
| } |
| if (error < 0) { |
| if (error != -ENOENT) |
| mlog_errno(error); |
| /* we haven't got any yet, so propagate the error. */ |
| goto bail_nolock; |
| } |
| |
| error = ocfs2_dir_foreach_blk(inode, &file->f_version, ctx, false); |
| |
| ocfs2_inode_unlock(inode, lock_level); |
| if (error) |
| mlog_errno(error); |
| |
| bail_nolock: |
| |
| return error; |
| } |
| |
| /* |
| * NOTE: this should always be called with parent dir i_rwsem taken. |
| */ |
| int ocfs2_find_files_on_disk(const char *name, |
| int namelen, |
| u64 *blkno, |
| struct inode *inode, |
| struct ocfs2_dir_lookup_result *lookup) |
| { |
| int status = -ENOENT; |
| |
| trace_ocfs2_find_files_on_disk(namelen, name, blkno, |
| (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| |
| status = ocfs2_find_entry(name, namelen, inode, lookup); |
| if (status) |
| goto leave; |
| |
| *blkno = le64_to_cpu(lookup->dl_entry->inode); |
| |
| status = 0; |
| leave: |
| |
| return status; |
| } |
| |
| /* |
| * Convenience function for callers which just want the block number |
| * mapped to a name and don't require the full dirent info, etc. |
| */ |
| int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name, |
| int namelen, u64 *blkno) |
| { |
| int ret; |
| struct ocfs2_dir_lookup_result lookup = { NULL, }; |
| |
| ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &lookup); |
| ocfs2_free_dir_lookup_result(&lookup); |
| |
| return ret; |
| } |
| |
| /* Check for a name within a directory. |
| * |
| * Return 0 if the name does not exist |
| * Return -EEXIST if the directory contains the name |
| * |
| * Callers should have i_rwsem + a cluster lock on dir |
| */ |
| int ocfs2_check_dir_for_entry(struct inode *dir, |
| const char *name, |
| int namelen) |
| { |
| int ret = 0; |
| struct ocfs2_dir_lookup_result lookup = { NULL, }; |
| |
| trace_ocfs2_check_dir_for_entry( |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, namelen, name); |
| |
| if (ocfs2_find_entry(name, namelen, dir, &lookup) == 0) { |
| ret = -EEXIST; |
| mlog_errno(ret); |
| } |
| |
| ocfs2_free_dir_lookup_result(&lookup); |
| |
| return ret; |
| } |
| |
| struct ocfs2_empty_dir_priv { |
| struct dir_context ctx; |
| unsigned seen_dot; |
| unsigned seen_dot_dot; |
| unsigned seen_other; |
| unsigned dx_dir; |
| }; |
| static bool ocfs2_empty_dir_filldir(struct dir_context *ctx, const char *name, |
| int name_len, loff_t pos, u64 ino, |
| unsigned type) |
| { |
| struct ocfs2_empty_dir_priv *p = |
| container_of(ctx, struct ocfs2_empty_dir_priv, ctx); |
| |
| /* |
| * Check the positions of "." and ".." records to be sure |
| * they're in the correct place. |
| * |
| * Indexed directories don't need to proceed past the first |
| * two entries, so we end the scan after seeing '..'. Despite |
| * that, we allow the scan to proceed In the event that we |
| * have a corrupted indexed directory (no dot or dot dot |
| * entries). This allows us to double check for existing |
| * entries which might not have been found in the index. |
| */ |
| if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) { |
| p->seen_dot = 1; |
| return true; |
| } |
| |
| if (name_len == 2 && !strncmp("..", name, 2) && |
| pos == OCFS2_DIR_REC_LEN(1)) { |
| p->seen_dot_dot = 1; |
| |
| if (p->dx_dir && p->seen_dot) |
| return false; |
| |
| return true; |
| } |
| |
| p->seen_other = 1; |
| return false; |
| } |
| |
| static int ocfs2_empty_dir_dx(struct inode *inode, |
| struct ocfs2_empty_dir_priv *priv) |
| { |
| int ret; |
| struct buffer_head *di_bh = NULL; |
| struct buffer_head *dx_root_bh = NULL; |
| struct ocfs2_dinode *di; |
| struct ocfs2_dx_root_block *dx_root; |
| |
| priv->dx_dir = 1; |
| |
| ret = ocfs2_read_inode_block(inode, &di_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| di = (struct ocfs2_dinode *)di_bh->b_data; |
| |
| ret = ocfs2_read_dx_root(inode, di, &dx_root_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; |
| |
| if (le32_to_cpu(dx_root->dr_num_entries) != 2) |
| priv->seen_other = 1; |
| |
| out: |
| brelse(di_bh); |
| brelse(dx_root_bh); |
| return ret; |
| } |
| |
| /* |
| * routine to check that the specified directory is empty (for rmdir) |
| * |
| * Returns 1 if dir is empty, zero otherwise. |
| * |
| * XXX: This is a performance problem for unindexed directories. |
| */ |
| int ocfs2_empty_dir(struct inode *inode) |
| { |
| int ret; |
| struct ocfs2_empty_dir_priv priv = { |
| .ctx.actor = ocfs2_empty_dir_filldir, |
| }; |
| |
| if (ocfs2_dir_indexed(inode)) { |
| ret = ocfs2_empty_dir_dx(inode, &priv); |
| if (ret) |
| mlog_errno(ret); |
| /* |
| * We still run ocfs2_dir_foreach to get the checks |
| * for "." and "..". |
| */ |
| } |
| |
| ret = ocfs2_dir_foreach(inode, &priv.ctx); |
| if (ret) |
| mlog_errno(ret); |
| |
| if (!priv.seen_dot || !priv.seen_dot_dot) { |
| mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n", |
| (unsigned long long)OCFS2_I(inode)->ip_blkno); |
| /* |
| * XXX: Is it really safe to allow an unlink to continue? |
| */ |
| return 1; |
| } |
| |
| return !priv.seen_other; |
| } |
| |
| /* |
| * Fills "." and ".." dirents in a new directory block. Returns dirent for |
| * "..", which might be used during creation of a directory with a trailing |
| * header. It is otherwise safe to ignore the return code. |
| */ |
| static struct ocfs2_dir_entry *ocfs2_fill_initial_dirents(struct inode *inode, |
| struct inode *parent, |
| char *start, |
| unsigned int size) |
| { |
| struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start; |
| |
| de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno); |
| de->name_len = 1; |
| de->rec_len = |
| cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len)); |
| strcpy(de->name, "."); |
| ocfs2_set_de_type(de, S_IFDIR); |
| |
| de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len)); |
| de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno); |
| de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1)); |
| de->name_len = 2; |
| strcpy(de->name, ".."); |
| ocfs2_set_de_type(de, S_IFDIR); |
| |
| return de; |
| } |
| |
| /* |
| * This works together with code in ocfs2_mknod_locked() which sets |
| * the inline-data flag and initializes the inline-data section. |
| */ |
| static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb, |
| handle_t *handle, |
| struct inode *parent, |
| struct inode *inode, |
| struct buffer_head *di_bh) |
| { |
| int ret; |
| struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| struct ocfs2_inline_data *data = &di->id2.i_data; |
| unsigned int size = le16_to_cpu(data->id_count); |
| |
| ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, |
| OCFS2_JOURNAL_ACCESS_WRITE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ocfs2_fill_initial_dirents(inode, parent, data->id_data, size); |
| ocfs2_journal_dirty(handle, di_bh); |
| |
| i_size_write(inode, size); |
| set_nlink(inode, 2); |
| inode->i_blocks = ocfs2_inode_sector_count(inode); |
| |
| ret = ocfs2_mark_inode_dirty(handle, inode, di_bh); |
| if (ret < 0) |
| mlog_errno(ret); |
| |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb, |
| handle_t *handle, |
| struct inode *parent, |
| struct inode *inode, |
| struct buffer_head *fe_bh, |
| struct ocfs2_alloc_context *data_ac, |
| struct buffer_head **ret_new_bh) |
| { |
| int status; |
| unsigned int size = osb->sb->s_blocksize; |
| struct buffer_head *new_bh = NULL; |
| struct ocfs2_dir_entry *de; |
| |
| if (ocfs2_new_dir_wants_trailer(inode)) |
| size = ocfs2_dir_trailer_blk_off(parent->i_sb); |
| |
| status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh, |
| data_ac, NULL, &new_bh); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh); |
| |
| status = ocfs2_journal_access_db(handle, INODE_CACHE(inode), new_bh, |
| OCFS2_JOURNAL_ACCESS_CREATE); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| memset(new_bh->b_data, 0, osb->sb->s_blocksize); |
| |
| de = ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data, size); |
| if (ocfs2_new_dir_wants_trailer(inode)) { |
| int size = le16_to_cpu(de->rec_len); |
| |
| /* |
| * Figure out the size of the hole left over after |
| * insertion of '.' and '..'. The trailer wants this |
| * information. |
| */ |
| size -= OCFS2_DIR_REC_LEN(2); |
| size -= sizeof(struct ocfs2_dir_block_trailer); |
| |
| ocfs2_init_dir_trailer(inode, new_bh, size); |
| } |
| |
| ocfs2_journal_dirty(handle, new_bh); |
| |
| i_size_write(inode, inode->i_sb->s_blocksize); |
| set_nlink(inode, 2); |
| inode->i_blocks = ocfs2_inode_sector_count(inode); |
| status = ocfs2_mark_inode_dirty(handle, inode, fe_bh); |
| if (status < 0) { |
| mlog_errno(status); |
| goto bail; |
| } |
| |
| status = 0; |
| if (ret_new_bh) { |
| *ret_new_bh = new_bh; |
| new_bh = NULL; |
| } |
| bail: |
| brelse(new_bh); |
| |
| return status; |
| } |
| |
| static int ocfs2_dx_dir_attach_index(struct ocfs2_super *osb, |
| handle_t *handle, struct inode *dir, |
| struct buffer_head *di_bh, |
| struct buffer_head *dirdata_bh, |
| struct ocfs2_alloc_context *meta_ac, |
| int dx_inline, u32 num_entries, |
| struct buffer_head **ret_dx_root_bh) |
| { |
| int ret; |
| struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; |
| u16 dr_suballoc_bit; |
| u64 suballoc_loc, dr_blkno; |
| unsigned int num_bits; |
| struct buffer_head *dx_root_bh = NULL; |
| struct ocfs2_dx_root_block *dx_root; |
| struct ocfs2_dir_block_trailer *trailer = |
| ocfs2_trailer_from_bh(dirdata_bh, dir->i_sb); |
| |
| ret = ocfs2_claim_metadata(handle, meta_ac, 1, &suballoc_loc, |
| &dr_suballoc_bit, &num_bits, &dr_blkno); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| trace_ocfs2_dx_dir_attach_index( |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, |
| (unsigned long long)dr_blkno); |
| |
| dx_root_bh = sb_getblk(osb->sb, dr_blkno); |
| if (dx_root_bh == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dx_root_bh); |
| |
| ret = ocfs2_journal_access_dr(handle, INODE_CACHE(dir), dx_root_bh, |
| OCFS2_JOURNAL_ACCESS_CREATE); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; |
| memset(dx_root, 0, osb->sb->s_blocksize); |
| strcpy(dx_root->dr_signature, OCFS2_DX_ROOT_SIGNATURE); |
| dx_root->dr_suballoc_slot = cpu_to_le16(meta_ac->ac_alloc_slot); |
| dx_root->dr_suballoc_loc = cpu_to_le64(suballoc_loc); |
| dx_root->dr_suballoc_bit = cpu_to_le16(dr_suballoc_bit); |
| dx_root->dr_fs_generation = cpu_to_le32(osb->fs_generation); |
| dx_root->dr_blkno = cpu_to_le64(dr_blkno); |
| dx_root->dr_dir_blkno = cpu_to_le64(OCFS2_I(dir)->ip_blkno); |
| dx_root->dr_num_entries = cpu_to_le32(num_entries); |
| if (le16_to_cpu(trailer->db_free_rec_len)) |
| dx_root->dr_free_blk = cpu_to_le64(dirdata_bh->b_blocknr); |
| else |
| dx_root->dr_free_blk = cpu_to_le64(0); |
| |
| if (dx_inline) { |
| dx_root->dr_flags |= OCFS2_DX_FLAG_INLINE; |
| dx_root->dr_entries.de_count = |
| cpu_to_le16(ocfs2_dx_entries_per_root(osb->sb)); |
| } else { |
| dx_root->dr_list.l_count = |
| cpu_to_le16(ocfs2_extent_recs_per_dx_root(osb->sb)); |
| } |
| ocfs2_journal_dirty(handle, dx_root_bh); |
| |
| ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh, |
| OCFS2_JOURNAL_ACCESS_CREATE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| di->i_dx_root = cpu_to_le64(dr_blkno); |
| |
| spin_lock(&OCFS2_I(dir)->ip_lock); |
| OCFS2_I(dir)->ip_dyn_features |= OCFS2_INDEXED_DIR_FL; |
| di->i_dyn_features = cpu_to_le16(OCFS2_I(dir)->ip_dyn_features); |
| spin_unlock(&OCFS2_I(dir)->ip_lock); |
| |
| ocfs2_journal_dirty(handle, di_bh); |
| |
| *ret_dx_root_bh = dx_root_bh; |
| dx_root_bh = NULL; |
| |
| out: |
| brelse(dx_root_bh); |
| return ret; |
| } |
| |
| static int ocfs2_dx_dir_format_cluster(struct ocfs2_super *osb, |
| handle_t *handle, struct inode *dir, |
| struct buffer_head **dx_leaves, |
| int num_dx_leaves, u64 start_blk) |
| { |
| int ret, i; |
| struct ocfs2_dx_leaf *dx_leaf; |
| struct buffer_head *bh; |
| |
| for (i = 0; i < num_dx_leaves; i++) { |
| bh = sb_getblk(osb->sb, start_blk + i); |
| if (bh == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| dx_leaves[i] = bh; |
| |
| ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), bh); |
| |
| ret = ocfs2_journal_access_dl(handle, INODE_CACHE(dir), bh, |
| OCFS2_JOURNAL_ACCESS_CREATE); |
| if (ret < 0) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| dx_leaf = (struct ocfs2_dx_leaf *) bh->b_data; |
| |
| memset(dx_leaf, 0, osb->sb->s_blocksize); |
| strcpy(dx_leaf->dl_signature, OCFS2_DX_LEAF_SIGNATURE); |
| dx_leaf->dl_fs_generation = cpu_to_le32(osb->fs_generation); |
| dx_leaf->dl_blkno = cpu_to_le64(bh->b_blocknr); |
| dx_leaf->dl_list.de_count = |
| cpu_to_le16(ocfs2_dx_entries_per_leaf(osb->sb)); |
| |
| trace_ocfs2_dx_dir_format_cluster( |
| (unsigned long long)OCFS2_I(dir)->ip_blkno, |
| (unsigned long long)bh->b_blocknr, |
| le16_to_cpu(dx_leaf->dl_list.de_count)); |
| |
| ocfs2_journal_dirty(handle, bh); |
| } |
| |
| ret = 0; |
| out: |
| return ret; |
| } |
| |
| /* |
| * Allocates and formats a new cluster for use in an indexed dir |
| * leaf. This version will not do the extent insert, so that it can be |
| * used by operations which need careful ordering. |
| */ |
| static int __ocfs2_dx_dir_new_cluster(struct inode *dir, |
| u32 cpos, handle_t *handle, |
| struct ocfs2_alloc_context *data_ac, |
| struct buffer_head **dx_leaves, |
| int num_dx_leaves, u64 *ret_phys_blkno) |
| { |
| int ret; |
| u32 phys, num; |
| u64 phys_blkno; |
| struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); |
| |
| /* |
| * XXX: For create, this should claim cluster for the index |
| * *before* the unindexed insert so that we have a better |
| * chance of contiguousness as the directory grows in number |
| * of entries. |
| */ |
| ret = __ocfs2_claim_clusters(handle, data_ac, 1, 1, &phys, &num); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * Format the new cluster first. That way, we're inserting |
| * valid data. |
| */ |
| phys_blkno = ocfs2_clusters_to_blocks(osb->sb, phys); |
| ret = ocfs2_dx_dir_format_cluster(osb, handle, dir, dx_leaves, |
| num_dx_leaves, phys_blkno); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| *ret_phys_blkno = phys_blkno; |
| out: |
| return ret; |
| } |
| |
| static int ocfs2_dx_dir_new_cluster(struct inode *dir, |
| struct ocfs2_extent_tree *et, |
| u32 cpos, handle_t *handle, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac, |
| struct buffer_head **dx_leaves, |
| int num_dx_leaves) |
| { |
| int ret; |
| u64 phys_blkno; |
| |
| ret = __ocfs2_dx_dir_new_cluster(dir, cpos, handle, data_ac, dx_leaves, |
| num_dx_leaves, &phys_blkno); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_insert_extent(handle, et, cpos, phys_blkno, 1, 0, |
| meta_ac); |
| if (ret) |
| mlog_errno(ret); |
| out: |
| return ret; |
| } |
| |
| static struct buffer_head **ocfs2_dx_dir_kmalloc_leaves(struct super_block *sb, |
| int *ret_num_leaves) |
| { |
| int num_dx_leaves = ocfs2_clusters_to_blocks(sb, 1); |
| struct buffer_head **dx_leaves; |
| |
| dx_leaves = kcalloc(num_dx_leaves, sizeof(struct buffer_head *), |
| GFP_NOFS); |
| if (dx_leaves && ret_num_leaves) |
| *ret_num_leaves = num_dx_leaves; |
| |
| return dx_leaves; |
| } |
| |
| static int ocfs2_fill_new_dir_dx(struct ocfs2_super *osb, |
| handle_t *handle, |
| struct inode *parent, |
| struct inode *inode, |
| struct buffer_head *di_bh, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac) |
| { |
| int ret; |
| struct buffer_head *leaf_bh = NULL; |
| struct buffer_head *dx_root_bh = NULL; |
| struct ocfs2_dx_hinfo hinfo; |
| struct ocfs2_dx_root_block *dx_root; |
| struct ocfs2_dx_entry_list *entry_list; |
| |
| /* |
| * Our strategy is to create the directory as though it were |
| * unindexed, then add the index block. This works with very |
| * little complication since the state of a new directory is a |
| * very well known quantity. |
| * |
| * Essentially, we have two dirents ("." and ".."), in the 1st |
| * block which need indexing. These are easily inserted into |
| * the index block. |
| */ |
| |
| ret = ocfs2_fill_new_dir_el(osb, handle, parent, inode, di_bh, |
| data_ac, &leaf_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = ocfs2_dx_dir_attach_index(osb, handle, inode, di_bh, leaf_bh, |
| meta_ac, 1, 2, &dx_root_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; |
| entry_list = &dx_root->dr_entries; |
| |
| /* Buffer has been journaled for us by ocfs2_dx_dir_attach_index */ |
| ocfs2_dx_dir_name_hash(inode, ".", 1, &hinfo); |
| ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr); |
| |
| ocfs2_dx_dir_name_hash(inode, "..", 2, &hinfo); |
| ocfs2_dx_entry_list_insert(entry_list, &hinfo, leaf_bh->b_blocknr); |
| |
| out: |
| brelse(dx_root_bh); |
| brelse(leaf_bh); |
| return ret; |
| } |
| |
| int ocfs2_fill_new_dir(struct ocfs2_super *osb, |
| handle_t *handle, |
| struct inode *parent, |
| struct inode *inode, |
| struct buffer_head *fe_bh, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac) |
| |
| { |
| BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL); |
| |
| if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) |
| return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh); |
| |
| if (ocfs2_supports_indexed_dirs(osb)) |
| return ocfs2_fill_new_dir_dx(osb, handle, parent, inode, fe_bh, |
| data_ac, meta_ac); |
| |
| return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh, |
| data_ac, NULL); |
| } |
| |
| static int ocfs2_dx_dir_index_block(struct inode *dir, |
| handle_t *handle, |
| struct buffer_head **dx_leaves, |
| int num_dx_leaves, |
| u32 *num_dx_entries, |
| struct buffer_head *dirent_bh) |
| { |
| int ret = 0, namelen, i; |
| char *de_buf, *limit; |
| struct ocfs2_dir_entry *de; |
| struct buffer_head *dx_leaf_bh; |
| struct ocfs2_dx_hinfo hinfo; |
| u64 dirent_blk = dirent_bh->b_blocknr; |
| |
| de_buf = dirent_bh->b_data; |
| limit = de_buf + dir->i_sb->s_blocksize; |
| |
| while (de_buf < limit) { |
| de = (struct ocfs2_dir_entry *)de_buf; |
| |
| namelen = de->name_len; |
| if (!namelen || !de->inode) |
| goto inc; |
| |
| ocfs2_dx_dir_name_hash(dir, de->name, namelen, &hinfo); |
| |
| i = ocfs2_dx_dir_hash_idx(OCFS2_SB(dir->i_sb), &hinfo); |
| dx_leaf_bh = dx_leaves[i]; |
| |
| ret = __ocfs2_dx_dir_leaf_insert(dir, handle, &hinfo, |
| dirent_blk, dx_leaf_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| *num_dx_entries = *num_dx_entries + 1; |
| |
| inc: |
| de_buf += le16_to_cpu(de->rec_len); |
| } |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * XXX: This expects dx_root_bh to already be part of the transaction. |
| */ |
| static void ocfs2_dx_dir_index_root_block(struct inode *dir, |
| struct buffer_head *dx_root_bh, |
| struct buffer_head *dirent_bh) |
| { |
| char *de_buf, *limit; |
| struct ocfs2_dx_root_block *dx_root; |
| struct ocfs2_dir_entry *de; |
| struct ocfs2_dx_hinfo hinfo; |
| u64 dirent_blk = dirent_bh->b_blocknr; |
| |
| dx_root = (struct ocfs2_dx_root_block *)dx_root_bh->b_data; |
| |
| de_buf = dirent_bh->b_data; |
| limit = de_buf + dir->i_sb->s_blocksize; |
| |
| while (de_buf < limit) { |
| de = (struct ocfs2_dir_entry *)de_buf; |
| |
| if (!de->name_len || !de->inode) |
| goto inc; |
| |
| ocfs2_dx_dir_name_hash(dir, de->name, de->name_len, &hinfo); |
| |
| trace_ocfs2_dx_dir_index_root_block( |
| (unsigned long long)dir->i_ino, |
| hinfo.major_hash, hinfo.minor_hash, |
| de->name_len, de->name, |
| le16_to_cpu(dx_root->dr_entries.de_num_used)); |
| |
| ocfs2_dx_entry_list_insert(&dx_root->dr_entries, &hinfo, |
| dirent_blk); |
| |
| le32_add_cpu(&dx_root->dr_num_entries, 1); |
| inc: |
| de_buf += le16_to_cpu(de->rec_len); |
| } |
| } |
| |
| /* |
| * Count the number of inline directory entries in di_bh and compare |
| * them against the number of entries we can hold in an inline dx root |
| * block. |
| */ |
| static int ocfs2_new_dx_should_be_inline(struct inode *dir, |
| struct buffer_head *di_bh) |
| { |
| int dirent_count = 0; |
| char *de_buf, *limit; |
| struct ocfs2_dir_entry *de; |
| struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| |
| de_buf = di->id2.i_data.id_data; |
| limit = de_buf + i_size_read(dir); |
| |
| while (de_buf < limit) { |
| de = (struct ocfs2_dir_entry *)de_buf; |
| |
| if (de->name_len && de->inode) |
| dirent_count++; |
| |
| de_buf += le16_to_cpu(de->rec_len); |
| } |
| |
| /* We are careful to leave room for one extra record. */ |
| return dirent_count < ocfs2_dx_entries_per_root(dir->i_sb); |
| } |
| |
| /* |
| * Expand rec_len of the rightmost dirent in a directory block so that it |
| * contains the end of our valid space for dirents. We do this during |
| * expansion from an inline directory to one with extents. The first dir block |
| * in that case is taken from the inline data portion of the inode block. |
| * |
| * This will also return the largest amount of contiguous space for a dirent |
| * in the block. That value is *not* necessarily the last dirent, even after |
| * expansion. The directory indexing code wants this value for free space |
| * accounting. We do this here since we're already walking the entire dir |
| * block. |
| * |
| * We add the dir trailer if this filesystem wants it. |
| */ |
| static unsigned int ocfs2_expand_last_dirent(char *start, unsigned int old_size, |
| struct inode *dir) |
| { |
| struct super_block *sb = dir->i_sb; |
| struct ocfs2_dir_entry *de; |
| struct ocfs2_dir_entry *prev_de; |
| char *de_buf, *limit; |
| unsigned int new_size = sb->s_blocksize; |
| unsigned int bytes, this_hole; |
| unsigned int largest_hole = 0; |
| |
| if (ocfs2_new_dir_wants_trailer(dir)) |
| new_size = ocfs2_dir_trailer_blk_off(sb); |
| |
| bytes = new_size - old_size; |
| |
| limit = start + old_size; |
| de_buf = start; |
| de = (struct ocfs2_dir_entry *)de_buf; |
| do { |
| this_hole = ocfs2_figure_dirent_hole(de); |
| if (this_hole > largest_hole) |
| largest_hole = this_hole; |
| |
| prev_de = de; |
| de_buf += le16_to_cpu(de->rec_len); |
| de = (struct ocfs2_dir_entry *)de_buf; |
| } while (de_buf < limit); |
| |
| le16_add_cpu(&prev_de->rec_len, bytes); |
| |
| /* We need to double check this after modification of the final |
| * dirent. */ |
| this_hole = ocfs2_figure_dirent_hole(prev_de); |
| if (this_hole > largest_hole) |
| largest_hole = this_hole; |
| |
| if (largest_hole >= OCFS2_DIR_MIN_REC_LEN) |
| return largest_hole; |
| return 0; |
| } |
| |
| /* |
| * We allocate enough clusters to fulfill "blocks_wanted", but set |
| * i_size to exactly one block. Ocfs2_extend_dir() will handle the |
| * rest automatically for us. |
| * |
| * *first_block_bh is a pointer to the 1st data block allocated to the |
| * directory. |
| */ |
| static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh, |
| unsigned int blocks_wanted, |
| struct ocfs2_dir_lookup_result *lookup, |
| struct buffer_head **first_block_bh) |
| { |
| u32 alloc, dx_alloc, bit_off, len, num_dx_entries = 0; |
| struct super_block *sb = dir->i_sb; |
| int ret, i, num_dx_leaves = 0, dx_inline = 0, |
| credits = ocfs2_inline_to_extents_credits(sb); |
| u64 dx_insert_blkno, blkno, |
| bytes = blocks_wanted << sb->s_blocksize_bits; |
| struct ocfs2_super *osb = OCFS2_SB(dir->i_sb); |
| struct ocfs2_inode_info *oi = OCFS2_I(dir); |
| struct ocfs2_alloc_context *data_ac = NULL; |
| struct ocfs2_alloc_context *meta_ac = NULL; |
| struct buffer_head *dirdata_bh = NULL; |
| struct buffer_head *dx_root_bh = NULL; |
| struct buffer_head **dx_leaves = NULL; |
| struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; |
| handle_t *handle; |
| struct ocfs2_extent_tree et; |
| struct ocfs2_extent_tree dx_et; |
| int did_quota = 0, bytes_allocated = 0; |
| |
| ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(dir), di_bh); |
| |
| alloc = ocfs2_clusters_for_bytes(sb, bytes); |
| dx_alloc = 0; |
| |
| down_write(&oi->ip_alloc_sem); |
| |
| if (ocfs2_supports_indexed_dirs(osb)) { |
| credits += ocfs2_add_dir_index_credits(sb); |
| |
| dx_inline = ocfs2_new_dx_should_be_inline(dir, di_bh); |
| if (!dx_inline) { |
| /* Add one more cluster for an index leaf */ |
| dx_alloc++; |
| dx_leaves = ocfs2_dx_dir_kmalloc_leaves(sb, |
| &num_dx_leaves); |
| if (!dx_leaves) { |
| ret = -ENOMEM; |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| /* This gets us the dx_root */ |
| ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| } |
| |
| /* |
| * We should never need more than 2 clusters for the unindexed |
| * tree - maximum dirent size is far less than one block. In |
| * fact, the only time we'd need more than one cluster is if |
| * blocksize == clustersize and the dirent won't fit in the |
| * extra space that the expansion to a single block gives. As |
| * of today, that only happens on 4k/4k file systems. |
| */ |
| BUG_ON(alloc > 2); |
| |
| ret = ocfs2_reserve_clusters(osb, alloc + dx_alloc, &data_ac); |
| if (ret) { |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| /* |
| * Prepare for worst case allocation scenario of two separate |
| * extents in the unindexed tree. |
| */ |
| if (alloc == 2) |
| credits += OCFS2_SUBALLOC_ALLOC; |
| |
| handle = ocfs2_start_trans(osb, credits); |
| if (IS_ERR(handle)) { |
| ret = PTR_ERR(handle); |
| mlog_errno(ret); |
| goto out; |
| } |
| |
| ret = dquot_alloc_space_nodirty(dir, |
| ocfs2_clusters_to_bytes(osb->sb, alloc + dx_alloc)); |
| if (ret) |
| goto out_commit; |
| did_quota = 1; |
| |
| if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) { |
| /* |
| * Allocate our index cluster first, to maximize the |
| * possibility that unindexed leaves grow |
| * contiguously. |
| */ |
| ret = __ocfs2_dx_dir_new_cluster(dir, 0, handle, data_ac, |
| dx_leaves, num_dx_leaves, |
| &dx_insert_blkno); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1); |
| } |
| |
| /* |
| * Try to claim as many clusters as the bitmap can give though |
| * if we only get one now, that's enough to continue. The rest |
| * will be claimed after the conversion to extents. |
| */ |
| if (ocfs2_dir_resv_allowed(osb)) |
| data_ac->ac_resv = &oi->ip_la_data_resv; |
| ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, &len); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1); |
| |
| /* |
| * Operations are carefully ordered so that we set up the new |
| * data block first. The conversion from inline data to |
| * extents follows. |
| */ |
| blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off); |
| dirdata_bh = sb_getblk(sb, blkno); |
| if (!dirdata_bh) { |
| ret = -ENOMEM; |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| |
| ocfs2_set_new_buffer_uptodate(INODE_CACHE(dir), dirdata_bh); |
| |
| ret = ocfs2_journal_access_db(handle, INODE_CACHE(dir), dirdata_bh, |
| OCFS2_JOURNAL_ACCESS_CREATE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| |
| memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir)); |
| memset(dirdata_bh->b_data + i_size_read(dir), 0, |
| sb->s_blocksize - i_size_read(dir)); |
| i = ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir), dir); |
| if (ocfs2_new_dir_wants_trailer(dir)) { |
| /* |
| * Prepare the dir trailer up front. It will otherwise look |
| * like a valid dirent. Even if inserting the index fails |
| * (unlikely), then all we'll have done is given first dir |
| * block a small amount of fragmentation. |
| */ |
| ocfs2_init_dir_trailer(dir, dirdata_bh, i); |
| } |
| |
| ocfs2_update_inode_fsync_trans(handle, dir, 1); |
| ocfs2_journal_dirty(handle, dirdata_bh); |
| |
| if (ocfs2_supports_indexed_dirs(osb) && !dx_inline) { |
| /* |
| * Dx dirs with an external cluster need to do this up |
| * front. Inline dx root's get handled later, after |
| * we've allocated our root block. We get passed back |
| * a total number of items so that dr_num_entries can |
| * be correctly set once the dx_root has been |
| * allocated. |
| */ |
| ret = ocfs2_dx_dir_index_block(dir, handle, dx_leaves, |
| num_dx_leaves, &num_dx_entries, |
| dirdata_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| } |
| |
| /* |
| * Set extent, i_size, etc on the directory. After this, the |
| * inode should contain the same exact dirents as before and |
| * be fully accessible from system calls. |
| * |
| * We let the later dirent insert modify c/mtime - to the user |
| * the data hasn't changed. |
| */ |
| ret = ocfs2_journal_access_di(handle, INODE_CACHE(dir), di_bh, |
| OCFS2_JOURNAL_ACCESS_CREATE); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| |
| spin_lock(&oi->ip_lock); |
| oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL; |
| di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features); |
| spin_unlock(&oi->ip_lock); |
| |
| ocfs2_dinode_new_extent_list(dir, di); |
| |
| i_size_write(dir, sb->s_blocksize); |
| dir->i_mtime = dir->i_ctime = current_time(dir); |
| |
| di->i_size = cpu_to_le64(sb->s_blocksize); |
| di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec); |
| di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec); |
| ocfs2_update_inode_fsync_trans(handle, dir, 1); |
| |
| /* |
| * This should never fail as our extent list is empty and all |
| * related blocks have been journaled already. |
| */ |
| ret = ocfs2_insert_extent(handle, &et, 0, blkno, len, |
| 0, NULL); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| |
| /* |
| * Set i_blocks after the extent insert for the most up to |
| * date ip_clusters value. |
| */ |
| dir->i_blocks = ocfs2_inode_sector_count(dir); |
| |
| ocfs2_journal_dirty(handle, di_bh); |
| |
| if (ocfs2_supports_indexed_dirs(osb)) { |
| ret = ocfs2_dx_dir_attach_index(osb, handle, dir, di_bh, |
| dirdata_bh, meta_ac, dx_inline, |
| num_dx_entries, &dx_root_bh); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| |
| if (dx_inline) { |
| ocfs2_dx_dir_index_root_block(dir, dx_root_bh, |
| dirdata_bh); |
| } else { |
| ocfs2_init_dx_root_extent_tree(&dx_et, |
| INODE_CACHE(dir), |
| dx_root_bh); |
| ret = ocfs2_insert_extent(handle, &dx_et, 0, |
| dx_insert_blkno, 1, 0, NULL); |
| if (ret) |
| mlog_errno(ret); |
| } |
| } |
| |
| /* |
| * We asked for two clusters, but only got one in the 1st |
| * pass. Claim the 2nd cluster as a separate extent. |
| */ |
| if (alloc > len) { |
| ret = ocfs2_claim_clusters(handle, data_ac, 1, &bit_off, |
| &len); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off); |
| |
| ret = ocfs2_insert_extent(handle, &et, 1, |
| blkno, len, 0, NULL); |
| if (ret) { |
| mlog_errno(ret); |
| goto out_commit; |
| } |
| bytes_allocated += ocfs2_clusters_to_bytes(dir->i_sb, 1); |
| } |
| |
| *first_block_bh = dirdata_bh; |
| dirdata_bh = NULL; |
| if (ocfs2_supports_indexed_dirs(osb)) { |
| unsigned int off; |
| |
| if (!dx_inline) { |
| /* |
| * We need to return the correct block within the |
| * cluster which should hold our entry. |
| */ |
| off = ocfs2_dx_dir_hash_idx(osb, |
| &lookup->dl_hinfo); |
| get_bh(dx_leaves[off]); |
| lookup->dl_dx_leaf_bh = dx_leaves[off]; |
| } |
| lookup->dl_dx_root_bh = dx_root_bh; |
| dx_root_bh = NULL; |
| } |
| |
| out_commit: |
| if (ret < 0 && did_quota) |
| dquot_free_space_nodirty(dir, bytes_allocated); |
| |
| ocfs2_commit_trans(osb, handle); |
| |
| out: |
| up_write(&oi->ip_alloc_sem); |
| if (data_ac) |
| ocfs2_free_alloc_context(data_ac); |
| if (meta_ac) |
| ocfs2_free_alloc_context(meta_ac); |
| |
| if (dx_leaves) { |
| for (i = 0; i < num_dx_leaves; i++) |
| brelse(dx_leaves[i]); |
| kfree(dx_leaves); |
| } |
| |
| brelse(dirdata_bh); |
| brelse(dx_root_bh); |
| |
| return ret; |
| } |
| |
| /* returns a bh of the 1st new block in the allocation. */ |
| static int ocfs2_do_extend_dir(struct super_block *sb, |
| handle_t *handle, |
| struct inode *dir, |
| struct buffer_head *parent_fe_bh, |
| struct ocfs2_alloc_context *data_ac, |
| struct ocfs2_alloc_context *meta_ac, |
| struct buffer_head **new_bh) |
| { |
| int status; |
| int extend, did_quota = 0; |
| u64 p_blkno, v_blkno; |
| |
| spin_lock(&OCFS2_I(dir)->ip_lock); |
| extend = (i_size_read(dir) == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)); |
| spin_unlock(&OCFS2_I(dir)->ip_lock); |
| |
| if (extend) { |
| u32 offset = OCFS2_I( |