diff options
Diffstat (limited to 'read-cache.c')
| -rw-r--r-- | read-cache.c | 200 |
1 files changed, 118 insertions, 82 deletions
diff --git a/read-cache.c b/read-cache.c index 7db55883d6..82a6238b77 100644 --- a/read-cache.c +++ b/read-cache.c @@ -30,20 +30,16 @@ struct index_state the_index; */ void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) { - ce->ce_ctime.sec = htonl(st->st_ctime); - ce->ce_mtime.sec = htonl(st->st_mtime); -#ifdef USE_NSEC - ce->ce_ctime.nsec = htonl(st->st_ctim.tv_nsec); - ce->ce_mtime.nsec = htonl(st->st_mtim.tv_nsec); -#endif - ce->ce_dev = htonl(st->st_dev); - ce->ce_ino = htonl(st->st_ino); - ce->ce_uid = htonl(st->st_uid); - ce->ce_gid = htonl(st->st_gid); - ce->ce_size = htonl(st->st_size); + ce->ce_ctime = st->st_ctime; + ce->ce_mtime = st->st_mtime; + ce->ce_dev = st->st_dev; + ce->ce_ino = st->st_ino; + ce->ce_uid = st->st_uid; + ce->ce_gid = st->st_gid; + ce->ce_size = st->st_size; if (assume_unchanged) - ce->ce_flags |= htons(CE_VALID); + ce->ce_flags |= CE_VALID; } static int ce_compare_data(struct cache_entry *ce, struct stat *st) @@ -116,7 +112,7 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st) return DATA_CHANGED; break; case S_IFDIR: - if (S_ISGITLINK(ntohl(ce->ce_mode))) + if (S_ISGITLINK(ce->ce_mode)) return 0; default: return TYPE_CHANGED; @@ -128,14 +124,17 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) { unsigned int changed = 0; - switch (ntohl(ce->ce_mode) & S_IFMT) { + if (ce->ce_flags & CE_REMOVE) + return MODE_CHANGED | DATA_CHANGED | TYPE_CHANGED; + + switch (ce->ce_mode & S_IFMT) { case S_IFREG: changed |= !S_ISREG(st->st_mode) ? TYPE_CHANGED : 0; /* We consider only the owner x bit to be relevant for * "mode changes" */ if (trust_executable_bit && - (0100 & (ntohl(ce->ce_mode) ^ st->st_mode))) + (0100 & (ce->ce_mode ^ st->st_mode))) changed |= MODE_CHANGED; break; case S_IFLNK: @@ -149,32 +148,18 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) else if (ce_compare_gitlink(ce)) changed |= DATA_CHANGED; return changed; - case 0: /* Special case: unmerged file in index */ - return MODE_CHANGED | DATA_CHANGED | TYPE_CHANGED; default: - die("internal error: ce_mode is %o", ntohl(ce->ce_mode)); + die("internal error: ce_mode is %o", ce->ce_mode); } - if (ce->ce_mtime.sec != htonl(st->st_mtime)) - changed |= MTIME_CHANGED; - if (ce->ce_ctime.sec != htonl(st->st_ctime)) - changed |= CTIME_CHANGED; - -#ifdef USE_NSEC - /* - * nsec seems unreliable - not all filesystems support it, so - * as long as it is in the inode cache you get right nsec - * but after it gets flushed, you get zero nsec. - */ - if (ce->ce_mtime.nsec != htonl(st->st_mtim.tv_nsec)) + if (ce->ce_mtime != (unsigned int) st->st_mtime) changed |= MTIME_CHANGED; - if (ce->ce_ctime.nsec != htonl(st->st_ctim.tv_nsec)) + if (ce->ce_ctime != (unsigned int) st->st_ctime) changed |= CTIME_CHANGED; -#endif - if (ce->ce_uid != htonl(st->st_uid) || - ce->ce_gid != htonl(st->st_gid)) + if (ce->ce_uid != (unsigned int) st->st_uid || + ce->ce_gid != (unsigned int) st->st_gid) changed |= OWNER_CHANGED; - if (ce->ce_ino != htonl(st->st_ino)) + if (ce->ce_ino != (unsigned int) st->st_ino) changed |= INODE_CHANGED; #ifdef USE_STDEV @@ -183,11 +168,11 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) * clients will have different views of what "device" * the filesystem is on */ - if (ce->ce_dev != htonl(st->st_dev)) + if (ce->ce_dev != (unsigned int) st->st_dev) changed |= INODE_CHANGED; #endif - if (ce->ce_size != htonl(st->st_size)) + if (ce->ce_size != (unsigned int) st->st_size) changed |= DATA_CHANGED; return changed; @@ -205,7 +190,7 @@ int ie_match_stat(struct index_state *istate, * If it's marked as always valid in the index, it's * valid whatever the checked-out copy says. */ - if (!ignore_valid && (ce->ce_flags & htons(CE_VALID))) + if (!ignore_valid && (ce->ce_flags & CE_VALID)) return 0; changed = ce_match_stat_basic(ce, st); @@ -228,7 +213,7 @@ int ie_match_stat(struct index_state *istate, */ if (!changed && istate->timestamp && - istate->timestamp <= ntohl(ce->ce_mtime.sec)) { + istate->timestamp <= ce->ce_mtime) { if (assume_racy_is_modified) changed |= DATA_CHANGED; else @@ -257,7 +242,7 @@ int ie_modified(struct index_state *istate, * the length field is zero. For other cases the ce_size * should match the SHA1 recorded in the index entry. */ - if ((changed & DATA_CHANGED) && ce->ce_size != htonl(0)) + if ((changed & DATA_CHANGED) && ce->ce_size != 0) return changed; changed_fs = ce_modified_check_fs(ce, st); @@ -320,7 +305,7 @@ int index_name_pos(struct index_state *istate, const char *name, int namelen) while (last > first) { int next = (last + first) >> 1; struct cache_entry *ce = istate->cache[next]; - int cmp = cache_name_compare(name, namelen, ce->name, ntohs(ce->ce_flags)); + int cmp = cache_name_compare(name, namelen, ce->name, ce->ce_flags); if (!cmp) return next; if (cmp < 0) { @@ -405,7 +390,7 @@ int add_file_to_index(struct index_state *istate, const char *path, int verbose) size = cache_entry_size(namelen); ce = xcalloc(1, size); memcpy(ce->name, path, namelen); - ce->ce_flags = htons(namelen); + ce->ce_flags = namelen; fill_stat_cache_info(ce, &st); if (trust_executable_bit && has_symlinks) @@ -583,7 +568,7 @@ static int has_file_name(struct index_state *istate, continue; if (p->name[len] != '/') continue; - if (!ce_stage(p) && !p->ce_mode) + if (p->ce_flags & CE_REMOVE) continue; retval = -1; if (!ok_to_replace) @@ -616,7 +601,7 @@ static int has_dir_name(struct index_state *istate, } len = slash - name; - pos = index_name_pos(istate, name, ntohs(create_ce_flags(len, stage))); + pos = index_name_pos(istate, name, create_ce_flags(len, stage)); if (pos >= 0) { /* * Found one, but not so fast. This could @@ -679,7 +664,7 @@ static int check_file_directory_conflict(struct index_state *istate, /* * When ce is an "I am going away" entry, we allow it to be added */ - if (!ce_stage(ce) && !ce->ce_mode) + if (ce->ce_flags & CE_REMOVE) return 0; /* @@ -704,7 +689,7 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e int skip_df_check = option & ADD_CACHE_SKIP_DFCHECK; cache_tree_invalidate_path(istate->cache_tree, ce->name); - pos = index_name_pos(istate, ce->name, ntohs(ce->ce_flags)); + pos = index_name_pos(istate, ce->name, ce->ce_flags); /* existing match? Just replace it. */ if (pos >= 0) { @@ -736,7 +721,7 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e if (!ok_to_replace) return error("'%s' appears as both a file and as a directory", ce->name); - pos = index_name_pos(istate, ce->name, ntohs(ce->ce_flags)); + pos = index_name_pos(istate, ce->name, ce->ce_flags); pos = -pos-1; } return pos + 1; @@ -810,7 +795,7 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, * valid again, under "assume unchanged" mode. */ if (ignore_valid && assume_unchanged && - !(ce->ce_flags & htons(CE_VALID))) + !(ce->ce_flags & CE_VALID)) ; /* mark this one VALID again */ else return ce; @@ -826,7 +811,6 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, updated = xmalloc(size); memcpy(updated, ce, size); fill_stat_cache_info(updated, &st); - /* * If ignore_valid is not set, we should leave CE_VALID bit * alone. Otherwise, paths marked with --no-assume-unchanged @@ -834,8 +818,8 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, * automatically, which is not really what we want. */ if (!ignore_valid && assume_unchanged && - !(ce->ce_flags & htons(CE_VALID))) - updated->ce_flags &= ~htons(CE_VALID); + !(ce->ce_flags & CE_VALID)) + updated->ce_flags &= ~CE_VALID; return updated; } @@ -880,7 +864,7 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p /* If we are doing --really-refresh that * means the index is not valid anymore. */ - ce->ce_flags &= ~htons(CE_VALID); + ce->ce_flags &= ~CE_VALID; istate->cache_changed = 1; } if (quiet) @@ -942,16 +926,34 @@ int read_index(struct index_state *istate) return read_index_from(istate, get_index_file()); } +static void convert_from_disk(struct ondisk_cache_entry *ondisk, struct cache_entry *ce) +{ + ce->ce_ctime = ntohl(ondisk->ctime.sec); + ce->ce_mtime = ntohl(ondisk->mtime.sec); + ce->ce_dev = ntohl(ondisk->dev); + ce->ce_ino = ntohl(ondisk->ino); + ce->ce_mode = ntohl(ondisk->mode); + ce->ce_uid = ntohl(ondisk->uid); + ce->ce_gid = ntohl(ondisk->gid); + ce->ce_size = ntohl(ondisk->size); + /* On-disk flags are just 16 bits */ + ce->ce_flags = ntohs(ondisk->flags); + hashcpy(ce->sha1, ondisk->sha1); + memcpy(ce->name, ondisk->name, ce_namelen(ce)+1); +} + /* remember to discard_cache() before reading a different cache! */ int read_index_from(struct index_state *istate, const char *path) { int fd, i; struct stat st; - unsigned long offset; + unsigned long src_offset, dst_offset; struct cache_header *hdr; + void *mmap; + size_t mmap_size; errno = EBUSY; - if (istate->mmap) + if (istate->alloc) return istate->cache_nr; errno = ENOENT; @@ -967,31 +969,47 @@ int read_index_from(struct index_state *istate, const char *path) die("cannot stat the open index (%s)", strerror(errno)); errno = EINVAL; - istate->mmap_size = xsize_t(st.st_size); - if (istate->mmap_size < sizeof(struct cache_header) + 20) + mmap_size = xsize_t(st.st_size); + if (mmap_size < sizeof(struct cache_header) + 20) die("index file smaller than expected"); - istate->mmap = xmmap(NULL, istate->mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); + mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); close(fd); + if (mmap == MAP_FAILED) + die("unable to map index file"); - hdr = istate->mmap; - if (verify_hdr(hdr, istate->mmap_size) < 0) + hdr = mmap; + if (verify_hdr(hdr, mmap_size) < 0) goto unmap; istate->cache_nr = ntohl(hdr->hdr_entries); istate->cache_alloc = alloc_nr(istate->cache_nr); istate->cache = xcalloc(istate->cache_alloc, sizeof(struct cache_entry *)); - offset = sizeof(*hdr); + /* + * The disk format is actually larger than the in-memory format, + * due to space for nsec etc, so even though the in-memory one + * has room for a few more flags, we can allocate using the same + * index size + */ + istate->alloc = xmalloc(mmap_size); + + src_offset = sizeof(*hdr); + dst_offset = 0; for (i = 0; i < istate->cache_nr; i++) { + struct ondisk_cache_entry *disk_ce; struct cache_entry *ce; - ce = (struct cache_entry *)((char *)(istate->mmap) + offset); - offset = offset + ce_size(ce); + disk_ce = (struct ondisk_cache_entry *)((char *)mmap + src_offset); + ce = (struct cache_entry *)((char *)istate->alloc + dst_offset); + convert_from_disk(disk_ce, ce); istate->cache[i] = ce; + + src_offset += ondisk_ce_size(ce); + dst_offset += ce_size(ce); } istate->timestamp = st.st_mtime; - while (offset <= istate->mmap_size - 20 - 8) { + while (src_offset <= mmap_size - 20 - 8) { /* After an array of active_nr index entries, * there can be arbitrary number of extended * sections, each of which is prefixed with @@ -999,40 +1017,36 @@ int read_index_from(struct index_state *istate, const char *path) * in 4-byte network byte order. */ unsigned long extsize; - memcpy(&extsize, (char *)(istate->mmap) + offset + 4, 4); + memcpy(&extsize, (char *)mmap + src_offset + 4, 4); extsize = ntohl(extsize); if (read_index_extension(istate, - ((const char *) (istate->mmap)) + offset, - (char *) (istate->mmap) + offset + 8, + (const char *) mmap + src_offset, + (char *) mmap + src_offset + 8, extsize) < 0) goto unmap; - offset += 8; - offset += extsize; + src_offset += 8; + src_offset += extsize; } + munmap(mmap, mmap_size); return istate->cache_nr; unmap: - munmap(istate->mmap, istate->mmap_size); + munmap(mmap, mmap_size); errno = EINVAL; die("index file corrupt"); } int discard_index(struct index_state *istate) { - int ret; - istate->cache_nr = 0; istate->cache_changed = 0; istate->timestamp = 0; cache_tree_free(&(istate->cache_tree)); - if (istate->mmap == NULL) - return 0; - ret = munmap(istate->mmap, istate->mmap_size); - istate->mmap = NULL; - istate->mmap_size = 0; + free(istate->alloc); + istate->alloc = NULL; /* no need to throw away allocated active_cache */ - return ret; + return 0; } #define WRITE_BUFFER_SIZE 8192 @@ -1144,10 +1158,32 @@ static void ce_smudge_racily_clean_entry(struct cache_entry *ce) * file, and never calls us, so the cached size information * for "frotz" stays 6 which does not match the filesystem. */ - ce->ce_size = htonl(0); + ce->ce_size = 0; } } +static int ce_write_entry(SHA_CTX *c, int fd, struct cache_entry *ce) +{ + int size = ondisk_ce_size(ce); + struct ondisk_cache_entry *ondisk = xcalloc(1, size); + + ondisk->ctime.sec = htonl(ce->ce_ctime); + ondisk->ctime.nsec = 0; + ondisk->mtime.sec = htonl(ce->ce_mtime); + ondisk->mtime.nsec = 0; + ondisk->dev = htonl(ce->ce_dev); + ondisk->ino = htonl(ce->ce_ino); + ondisk->mode = htonl(ce->ce_mode); + ondisk->uid = htonl(ce->ce_uid); + ondisk->gid = htonl(ce->ce_gid); + ondisk->size = htonl(ce->ce_size); + hashcpy(ondisk->sha1, ce->sha1); + ondisk->flags = htons(ce->ce_flags); + memcpy(ondisk->name, ce->name, ce_namelen(ce)); + + return ce_write(c, fd, ondisk, size); +} + int write_index(struct index_state *istate, int newfd) { SHA_CTX c; @@ -1157,7 +1193,7 @@ int write_index(struct index_state *istate, int newfd) int entries = istate->cache_nr; for (i = removed = 0; i < entries; i++) - if (!cache[i]->ce_mode) + if (cache[i]->ce_flags & CE_REMOVE) removed++; hdr.hdr_signature = htonl(CACHE_SIGNATURE); @@ -1170,12 +1206,12 @@ int write_index(struct index_state *istate, int newfd) for (i = 0; i < entries; i++) { struct cache_entry *ce = cache[i]; - if (!ce->ce_mode) + if (ce->ce_flags & CE_REMOVE) continue; if (istate->timestamp && - istate->timestamp <= ntohl(ce->ce_mtime.sec)) + istate->timestamp <= ce->ce_mtime) ce_smudge_racily_clean_entry(ce); - if (ce_write(&c, newfd, ce, ce_size(ce)) < 0) + if (ce_write_entry(&c, newfd, ce) < 0) return -1; } |