diff options
Diffstat (limited to 'read-cache.c')
| -rw-r--r-- | read-cache.c | 672 |
1 files changed, 476 insertions, 196 deletions
diff --git a/read-cache.c b/read-cache.c index 5790a91044..c3d5e3543f 100644 --- a/read-cache.c +++ b/read-cache.c @@ -12,9 +12,15 @@ #include "commit.h" #include "blob.h" #include "resolve-undo.h" +#include "strbuf.h" +#include "varint.h" static struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really); +/* Mask for the name length in ce_flags in the on-disk index */ + +#define CE_NAMEMASK (0x0fff) + /* Index extensions. * * The first letter should be 'A'..'Z' for extensions that are not @@ -40,7 +46,7 @@ static void replace_index_entry(struct index_state *istate, int nr, struct cache { struct cache_entry *old = istate->cache[nr]; - remove_name_hash(old); + remove_name_hash(istate, old); set_index_entry(istate, nr, ce); istate->cache_changed = 1; } @@ -52,8 +58,8 @@ void rename_index_entry_at(struct index_state *istate, int nr, const char *new_n new = xmalloc(cache_entry_size(namelen)); copy_cache_entry(new, old); - new->ce_flags &= ~(CE_STATE_MASK | CE_NAMEMASK); - new->ce_flags |= (namelen >= CE_NAMEMASK ? CE_NAMEMASK : namelen); + new->ce_flags &= ~CE_STATE_MASK; + new->ce_namelen = namelen; memcpy(new->name, new_name, namelen + 1); cache_tree_invalidate_path(istate->cache_tree, old->name); @@ -61,6 +67,61 @@ void rename_index_entry_at(struct index_state *istate, int nr, const char *new_n add_index_entry(istate, new, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE); } +void fill_stat_data(struct stat_data *sd, struct stat *st) +{ + sd->sd_ctime.sec = (unsigned int)st->st_ctime; + sd->sd_mtime.sec = (unsigned int)st->st_mtime; + sd->sd_ctime.nsec = ST_CTIME_NSEC(*st); + sd->sd_mtime.nsec = ST_MTIME_NSEC(*st); + sd->sd_dev = st->st_dev; + sd->sd_ino = st->st_ino; + sd->sd_uid = st->st_uid; + sd->sd_gid = st->st_gid; + sd->sd_size = st->st_size; +} + +int match_stat_data(const struct stat_data *sd, struct stat *st) +{ + int changed = 0; + + if (sd->sd_mtime.sec != (unsigned int)st->st_mtime) + changed |= MTIME_CHANGED; + if (trust_ctime && check_stat && + sd->sd_ctime.sec != (unsigned int)st->st_ctime) + changed |= CTIME_CHANGED; + +#ifdef USE_NSEC + if (check_stat && sd->sd_mtime.nsec != ST_MTIME_NSEC(*st)) + changed |= MTIME_CHANGED; + if (trust_ctime && check_stat && + sd->sd_ctime.nsec != ST_CTIME_NSEC(*st)) + changed |= CTIME_CHANGED; +#endif + + if (check_stat) { + if (sd->sd_uid != (unsigned int) st->st_uid || + sd->sd_gid != (unsigned int) st->st_gid) + changed |= OWNER_CHANGED; + if (sd->sd_ino != (unsigned int) st->st_ino) + changed |= INODE_CHANGED; + } + +#ifdef USE_STDEV + /* + * st_dev breaks on network filesystems where different + * clients will have different views of what "device" + * the filesystem is on + */ + if (check_stat && sd->sd_dev != (unsigned int) st->st_dev) + changed |= INODE_CHANGED; +#endif + + if (sd->sd_size != (unsigned int) st->st_size) + changed |= DATA_CHANGED; + + return changed; +} + /* * This only updates the "non-critical" parts of the directory * cache, ie the parts that aren't tracked by GIT, and only used @@ -68,15 +129,7 @@ void rename_index_entry_at(struct index_state *istate, int nr, const char *new_n */ void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) { - ce->ce_ctime.sec = (unsigned int)st->st_ctime; - ce->ce_mtime.sec = (unsigned int)st->st_mtime; - ce->ce_ctime.nsec = ST_CTIME_NSEC(*st); - ce->ce_mtime.nsec = ST_MTIME_NSEC(*st); - 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; + fill_stat_data(&ce->ce_stat_data, st); if (assume_unchanged) ce->ce_flags |= CE_VALID; @@ -85,7 +138,7 @@ void fill_stat_cache_info(struct cache_entry *ce, struct stat *st) ce_mark_uptodate(ce); } -static int ce_compare_data(struct cache_entry *ce, struct stat *st) +static int ce_compare_data(const struct cache_entry *ce, struct stat *st) { int match = -1; int fd = open(ce->name, O_RDONLY); @@ -99,7 +152,7 @@ static int ce_compare_data(struct cache_entry *ce, struct stat *st) return match; } -static int ce_compare_link(struct cache_entry *ce, size_t expected_size) +static int ce_compare_link(const struct cache_entry *ce, size_t expected_size) { int match = -1; void *buffer; @@ -120,7 +173,7 @@ static int ce_compare_link(struct cache_entry *ce, size_t expected_size) return match; } -static int ce_compare_gitlink(struct cache_entry *ce) +static int ce_compare_gitlink(const struct cache_entry *ce) { unsigned char sha1[20]; @@ -137,7 +190,7 @@ static int ce_compare_gitlink(struct cache_entry *ce) return hashcmp(sha1, ce->sha1); } -static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st) +static int ce_modified_check_fs(const struct cache_entry *ce, struct stat *st) { switch (st->st_mode & S_IFMT) { case S_IFREG: @@ -157,17 +210,7 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st) return 0; } -static int is_empty_blob_sha1(const unsigned char *sha1) -{ - static const unsigned char empty_blob_sha1[20] = { - 0xe6,0x9d,0xe2,0x9b,0xb2,0xd1,0xd6,0x43,0x4b,0x8b, - 0x29,0xae,0x77,0x5a,0xd8,0xc2,0xe4,0x8c,0x53,0x91 - }; - - return !hashcmp(sha1, empty_blob_sha1); -} - -static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) +static int ce_match_stat_basic(const struct cache_entry *ce, struct stat *st) { unsigned int changed = 0; @@ -199,39 +242,11 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) default: die("internal error: ce_mode is %o", ce->ce_mode); } - if (ce->ce_mtime.sec != (unsigned int)st->st_mtime) - changed |= MTIME_CHANGED; - if (trust_ctime && ce->ce_ctime.sec != (unsigned int)st->st_ctime) - changed |= CTIME_CHANGED; - -#ifdef USE_NSEC - if (ce->ce_mtime.nsec != ST_MTIME_NSEC(*st)) - changed |= MTIME_CHANGED; - if (trust_ctime && ce->ce_ctime.nsec != ST_CTIME_NSEC(*st)) - changed |= CTIME_CHANGED; -#endif - if (ce->ce_uid != (unsigned int) st->st_uid || - ce->ce_gid != (unsigned int) st->st_gid) - changed |= OWNER_CHANGED; - if (ce->ce_ino != (unsigned int) st->st_ino) - changed |= INODE_CHANGED; - -#ifdef USE_STDEV - /* - * st_dev breaks on network filesystems where different - * clients will have different views of what "device" - * the filesystem is on - */ - if (ce->ce_dev != (unsigned int) st->st_dev) - changed |= INODE_CHANGED; -#endif - - if (ce->ce_size != (unsigned int) st->st_size) - changed |= DATA_CHANGED; + changed |= match_stat_data(&ce->ce_stat_data, st); /* Racily smudged entry? */ - if (!ce->ce_size) { + if (!ce->ce_stat_data.sd_size) { if (!is_empty_blob_sha1(ce->sha1)) changed |= DATA_CHANGED; } @@ -239,23 +254,24 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st) return changed; } -static int is_racy_timestamp(const struct index_state *istate, struct cache_entry *ce) +static int is_racy_timestamp(const struct index_state *istate, + const struct cache_entry *ce) { return (!S_ISGITLINK(ce->ce_mode) && istate->timestamp.sec && #ifdef USE_NSEC /* nanosecond timestamped files can also be racy! */ - (istate->timestamp.sec < ce->ce_mtime.sec || - (istate->timestamp.sec == ce->ce_mtime.sec && - istate->timestamp.nsec <= ce->ce_mtime.nsec)) + (istate->timestamp.sec < ce->ce_stat_data.sd_mtime.sec || + (istate->timestamp.sec == ce->ce_stat_data.sd_mtime.sec && + istate->timestamp.nsec <= ce->ce_stat_data.sd_mtime.nsec)) #else - istate->timestamp.sec <= ce->ce_mtime.sec + istate->timestamp.sec <= ce->ce_stat_data.sd_mtime.sec #endif ); } int ie_match_stat(const struct index_state *istate, - struct cache_entry *ce, struct stat *st, + const struct cache_entry *ce, struct stat *st, unsigned int options) { unsigned int changed; @@ -311,7 +327,8 @@ int ie_match_stat(const struct index_state *istate, } int ie_modified(const struct index_state *istate, - struct cache_entry *ce, struct stat *st, unsigned int options) + const struct cache_entry *ce, + struct stat *st, unsigned int options) { int changed, changed_fs; @@ -340,7 +357,7 @@ int ie_modified(const struct index_state *istate, * then we know it is. */ if ((changed & DATA_CHANGED) && - (S_ISGITLINK(ce->ce_mode) || ce->ce_size != 0)) + (S_ISGITLINK(ce->ce_mode) || ce->ce_stat_data.sd_size != 0)) return changed; changed_fs = ce_modified_check_fs(ce, st); @@ -403,10 +420,8 @@ int df_name_compare(const char *name1, int len1, int mode1, return c1 - c2; } -int cache_name_compare(const char *name1, int flags1, const char *name2, int flags2) +int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2) { - int len1 = flags1 & CE_NAMEMASK; - int len2 = flags2 & CE_NAMEMASK; int len = len1 < len2 ? len1 : len2; int cmp; @@ -418,18 +433,19 @@ int cache_name_compare(const char *name1, int flags1, const char *name2, int fla if (len1 > len2) return 1; - /* Compare stages */ - flags1 &= CE_STAGEMASK; - flags2 &= CE_STAGEMASK; - - if (flags1 < flags2) + if (stage1 < stage2) return -1; - if (flags1 > flags2) + if (stage1 > stage2) return 1; return 0; } -int index_name_pos(const struct index_state *istate, const char *name, int namelen) +int cache_name_compare(const char *name1, int len1, const char *name2, int len2) +{ + return cache_name_stage_compare(name1, len1, 0, name2, len2, 0); +} + +static int index_name_stage_pos(const struct index_state *istate, const char *name, int namelen, int stage) { int first, last; @@ -438,7 +454,7 @@ int index_name_pos(const struct index_state *istate, const char *name, int namel while (last > first) { int next = (last + first) >> 1; struct cache_entry *ce = istate->cache[next]; - int cmp = cache_name_compare(name, namelen, ce->name, ce->ce_flags); + int cmp = cache_name_stage_compare(name, namelen, stage, ce->name, ce_namelen(ce), ce_stage(ce)); if (!cmp) return next; if (cmp < 0) { @@ -450,13 +466,18 @@ int index_name_pos(const struct index_state *istate, const char *name, int namel return -first-1; } +int index_name_pos(const struct index_state *istate, const char *name, int namelen) +{ + return index_name_stage_pos(istate, name, namelen, 0); +} + /* Remove entry, return true if there are more entries to go.. */ int remove_index_entry_at(struct index_state *istate, int pos) { struct cache_entry *ce = istate->cache[pos]; record_resolve_undo(istate, ce); - remove_name_hash(ce); + remove_name_hash(istate, ce); istate->cache_changed = 1; istate->cache_nr--; if (pos >= istate->cache_nr) @@ -468,7 +489,7 @@ int remove_index_entry_at(struct index_state *istate, int pos) } /* - * Remove all cache ententries marked for removal, that is where + * Remove all cache entries marked for removal, that is where * CE_REMOVE is set in ce_flags. This is much more effective than * calling remove_index_entry_at() for each entry to be removed. */ @@ -479,7 +500,7 @@ void remove_marked_cache_entries(struct index_state *istate) for (i = j = 0; i < istate->cache_nr; i++) { if (ce_array[i]->ce_flags & CE_REMOVE) - remove_name_hash(ce_array[i]); + remove_name_hash(istate, ce_array[i]); else ce_array[j++] = ce_array[i]; } @@ -589,7 +610,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, size = cache_entry_size(namelen); ce = xcalloc(1, size); memcpy(ce->name, path, namelen); - ce->ce_flags = namelen; + ce->ce_namelen = namelen; if (!intent_only) fill_stat_cache_info(ce, st); else @@ -622,7 +643,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st, if (*ptr == '/') { struct cache_entry *foundce; ++ptr; - foundce = index_name_exists(&the_index, ce->name, ptr - ce->name, ignore_case); + foundce = index_name_exists(istate, ce->name, ptr - ce->name, ignore_case); if (foundce) { memcpy((void *)startPtr, foundce->name + (startPtr - ce->name), ptr - startPtr); startPtr = ptr; @@ -691,7 +712,8 @@ struct cache_entry *make_cache_entry(unsigned int mode, hashcpy(ce->sha1, sha1); memcpy(ce->name, path, len); - ce->ce_flags = create_ce_flags(len, stage); + ce->ce_flags = create_ce_flags(stage); + ce->ce_namelen = len; ce->ce_mode = create_ce_mode(mode); if (refresh) @@ -700,7 +722,7 @@ struct cache_entry *make_cache_entry(unsigned int mode, return ce; } -int ce_same_name(struct cache_entry *a, struct cache_entry *b) +int ce_same_name(const struct cache_entry *a, const struct cache_entry *b) { int len = ce_namelen(a); return ce_namelen(b) == len && !memcmp(a->name, b->name, len); @@ -828,7 +850,7 @@ static int has_dir_name(struct index_state *istate, } len = slash - name; - pos = index_name_pos(istate, name, create_ce_flags(len, stage)); + pos = index_name_stage_pos(istate, name, len, stage); if (pos >= 0) { /* * Found one, but not so fast. This could @@ -918,7 +940,7 @@ static int add_index_entry_with_check(struct index_state *istate, struct cache_e int new_only = option & ADD_CACHE_NEW_ONLY; cache_tree_invalidate_path(istate->cache_tree, ce->name); - pos = index_name_pos(istate, ce->name, ce->ce_flags); + pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce)); /* existing match? Just replace it. */ if (pos >= 0) { @@ -950,7 +972,7 @@ 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, ce->ce_flags); + pos = index_name_stage_pos(istate, ce->name, ce_namelen(ce), ce_stage(ce)); pos = -pos-1; } return pos + 1; @@ -974,7 +996,7 @@ int add_index_entry(struct index_state *istate, struct cache_entry *ce, int opti if (istate->cache_nr == istate->cache_alloc) { istate->cache_alloc = alloc_nr(istate->cache_alloc); istate->cache = xrealloc(istate->cache, - istate->cache_alloc * sizeof(struct cache_entry *)); + istate->cache_alloc * sizeof(*istate->cache)); } /* Add it in.. */ @@ -1001,7 +1023,8 @@ int add_index_entry(struct index_state *istate, struct cache_entry *ce, int opti */ static struct cache_entry *refresh_cache_ent(struct index_state *istate, struct cache_entry *ce, - unsigned int options, int *err) + unsigned int options, int *err, + int *changed_ret) { struct stat st; struct cache_entry *updated; @@ -1033,6 +1056,8 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate, } changed = ie_match_stat(istate, ce, &st, options); + if (changed_ret) + *changed_ret = changed; if (!changed) { /* * The path is unchanged. If we were told to ignore @@ -1102,19 +1127,31 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p int first = 1; int in_porcelain = (flags & REFRESH_IN_PORCELAIN); unsigned int options = really ? CE_MATCH_IGNORE_VALID : 0; - const char *needs_update_fmt; - const char *needs_merge_fmt; - - needs_update_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n"); - needs_merge_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n"); + const char *modified_fmt; + const char *deleted_fmt; + const char *typechange_fmt; + const char *added_fmt; + const char *unmerged_fmt; + + modified_fmt = (in_porcelain ? "M\t%s\n" : "%s: needs update\n"); + deleted_fmt = (in_porcelain ? "D\t%s\n" : "%s: needs update\n"); + typechange_fmt = (in_porcelain ? "T\t%s\n" : "%s needs update\n"); + added_fmt = (in_porcelain ? "A\t%s\n" : "%s needs update\n"); + unmerged_fmt = (in_porcelain ? "U\t%s\n" : "%s: needs merge\n"); for (i = 0; i < istate->cache_nr; i++) { struct cache_entry *ce, *new; int cache_errno = 0; + int changed = 0; + int filtered = 0; ce = istate->cache[i]; if (ignore_submodules && S_ISGITLINK(ce->ce_mode)) continue; + if (pathspec && + !match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen)) + filtered = 1; + if (ce_stage(ce)) { while ((i < istate->cache_nr) && ! strcmp(istate->cache[i]->name, ce->name)) @@ -1122,18 +1159,22 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p i--; if (allow_unmerged) continue; - show_file(needs_merge_fmt, ce->name, in_porcelain, &first, header_msg); + if (!filtered) + show_file(unmerged_fmt, ce->name, in_porcelain, + &first, header_msg); has_errors = 1; continue; } - if (pathspec && !match_pathspec(pathspec, ce->name, strlen(ce->name), 0, seen)) + if (filtered) continue; - new = refresh_cache_ent(istate, ce, options, &cache_errno); + new = refresh_cache_ent(istate, ce, options, &cache_errno, &changed); if (new == ce) continue; if (!new) { + const char *fmt; + if (not_new && cache_errno == ENOENT) continue; if (really && cache_errno == EINVAL) { @@ -1145,7 +1186,17 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p } if (quiet) continue; - show_file(needs_update_fmt, ce->name, in_porcelain, &first, header_msg); + + if (cache_errno == ENOENT) + fmt = deleted_fmt; + else if (ce->ce_flags & CE_INTENT_TO_ADD) + fmt = added_fmt; /* must be before other checks */ + else if (changed & TYPE_CHANGED) + fmt = typechange_fmt; + else + fmt = modified_fmt; + show_file(fmt, + ce->name, in_porcelain, &first, header_msg); has_errors = 1; continue; } @@ -1157,18 +1208,77 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p static struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really) { - return refresh_cache_ent(&the_index, ce, really, NULL); + return refresh_cache_ent(&the_index, ce, really, NULL, NULL); } + +/***************************************************************** + * Index File I/O + *****************************************************************/ + +#define INDEX_FORMAT_DEFAULT 3 + +/* + * dev/ino/uid/gid/size are also just tracked to the low 32 bits + * Again - this is just a (very strong in practice) heuristic that + * the inode hasn't changed. + * + * We save the fields in big-endian order to allow using the + * index file over NFS transparently. + */ +struct ondisk_cache_entry { + struct cache_time ctime; + struct cache_time mtime; + unsigned int dev; + unsigned int ino; + unsigned int mode; + unsigned int uid; + unsigned int gid; + unsigned int size; + unsigned char sha1[20]; + unsigned short flags; + char name[FLEX_ARRAY]; /* more */ +}; + +/* + * This struct is used when CE_EXTENDED bit is 1 + * The struct must match ondisk_cache_entry exactly from + * ctime till flags + */ +struct ondisk_cache_entry_extended { + struct cache_time ctime; + struct cache_time mtime; + unsigned int dev; + unsigned int ino; + unsigned int mode; + unsigned int uid; + unsigned int gid; + unsigned int size; + unsigned char sha1[20]; + unsigned short flags; + unsigned short flags2; + char name[FLEX_ARRAY]; /* more */ +}; + +/* These are only used for v3 or lower */ +#define align_flex_name(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7) +#define ondisk_cache_entry_size(len) align_flex_name(ondisk_cache_entry,len) +#define ondisk_cache_entry_extended_size(len) align_flex_name(ondisk_cache_entry_extended,len) +#define ondisk_ce_size(ce) (((ce)->ce_flags & CE_EXTENDED) ? \ + ondisk_cache_entry_extended_size(ce_namelen(ce)) : \ + ondisk_cache_entry_size(ce_namelen(ce))) + static int verify_hdr(struct cache_header *hdr, unsigned long size) { git_SHA_CTX c; unsigned char sha1[20]; + int hdr_version; if (hdr->hdr_signature != htonl(CACHE_SIGNATURE)) return error("bad signature"); - if (hdr->hdr_version != htonl(2) && hdr->hdr_version != htonl(3)) - return error("bad index version"); + hdr_version = ntohl(hdr->hdr_version); + if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version) + return error("bad index version %d", hdr_version); git_SHA1_Init(&c); git_SHA1_Update(&c, hdr, size - 20); git_SHA1_Final(sha1, &c); @@ -1202,63 +1312,116 @@ 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) +#ifndef NEEDS_ALIGNED_ACCESS +#define ntoh_s(var) ntohs(var) +#define ntoh_l(var) ntohl(var) +#else +static inline uint16_t ntoh_s_force_align(void *p) +{ + uint16_t x; + memcpy(&x, p, sizeof(x)); + return ntohs(x); +} +static inline uint32_t ntoh_l_force_align(void *p) +{ + uint32_t x; + memcpy(&x, p, sizeof(x)); + return ntohl(x); +} +#define ntoh_s(var) ntoh_s_force_align(&(var)) +#define ntoh_l(var) ntoh_l_force_align(&(var)) +#endif + +static struct cache_entry *cache_entry_from_ondisk(struct ondisk_cache_entry *ondisk, + unsigned int flags, + const char *name, + size_t len) { + struct cache_entry *ce = xmalloc(cache_entry_size(len)); + + ce->ce_stat_data.sd_ctime.sec = ntoh_l(ondisk->ctime.sec); + ce->ce_stat_data.sd_mtime.sec = ntoh_l(ondisk->mtime.sec); + ce->ce_stat_data.sd_ctime.nsec = ntoh_l(ondisk->ctime.nsec); + ce->ce_stat_data.sd_mtime.nsec = ntoh_l(ondisk->mtime.nsec); + ce->ce_stat_data.sd_dev = ntoh_l(ondisk->dev); + ce->ce_stat_data.sd_ino = ntoh_l(ondisk->ino); + ce->ce_mode = ntoh_l(ondisk->mode); + ce->ce_stat_data.sd_uid = ntoh_l(ondisk->uid); + ce->ce_stat_data.sd_gid = ntoh_l(ondisk->gid); + ce->ce_stat_data.sd_size = ntoh_l(ondisk->size); + ce->ce_flags = flags & ~CE_NAMEMASK; + ce->ce_namelen = len; + hashcpy(ce->sha1, ondisk->sha1); + memcpy(ce->name, name, len); + ce->name[len] = '\0'; + return ce; +} + +/* + * Adjacent cache entries tend to share the leading paths, so it makes + * sense to only store the differences in later entries. In the v4 + * on-disk format of the index, each on-disk cache entry stores the + * number of bytes to be stripped from the end of the previous name, + * and the bytes to append to the result, to come up with its name. + */ +static unsigned long expand_name_field(struct strbuf *name, const char *cp_) +{ + const unsigned char *ep, *cp = (const unsigned char *)cp_; + size_t len = decode_varint(&cp); + + if (name->len < len) + die("malformed name field in the index"); + strbuf_remove(name, name->len - len, len); + for (ep = cp; *ep; ep++) + ; /* find the end */ + strbuf_add(name, cp, ep - cp); + return (const char *)ep + 1 - cp_; +} + +static struct cache_entry *create_from_disk(struct ondisk_cache_entry *ondisk, + unsigned long *ent_size, + struct strbuf *previous_name) +{ + struct cache_entry *ce; size_t len; const char *name; + unsigned int flags; - ce->ce_ctime.sec = ntohl(ondisk->ctime.sec); - ce->ce_mtime.sec = ntohl(ondisk->mtime.sec); - ce->ce_ctime.nsec = ntohl(ondisk->ctime.nsec); - ce->ce_mtime.nsec = ntohl(ondisk->mtime.nsec); - 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); + flags = ntoh_s(ondisk->flags); + len = flags & CE_NAMEMASK; - len = ce->ce_flags & CE_NAMEMASK; - - if (ce->ce_flags & CE_EXTENDED) { + if (flags & CE_EXTENDED) { struct ondisk_cache_entry_extended *ondisk2; int extended_flags; ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; - extended_flags = ntohs(ondisk2->flags2) << 16; + extended_flags = ntoh_s(ondisk2->flags2) << 16; /* We do not yet understand any bit out of CE_EXTENDED_FLAGS */ if (extended_flags & ~CE_EXTENDED_FLAGS) die("Unknown index entry format %08x", extended_flags); - ce->ce_flags |= extended_flags; + flags |= extended_flags; name = ondisk2->name; } else name = ondisk->name; - if (len == CE_NAMEMASK) - len = strlen(name); - /* - * NEEDSWORK: If the original index is crafted, this copy could - * go unchecked. - */ - memcpy(ce->name, name, len + 1); -} - -static inline size_t estimate_cache_size(size_t ondisk_size, unsigned int entries) -{ - size_t fix_size_mem = offsetof(struct cache_entry, name); - size_t fix_size_dsk = offsetof(struct ondisk_cache_entry, name); - long per_entry = (fix_size_mem - fix_size_dsk + 7) & ~7; - - /* - * Alignment can cause differences. This should be "alignof", but - * since that's a gcc'ism, just use the size of a pointer. - */ - per_entry += sizeof(void *); - return ondisk_size + entries*per_entry; + if (!previous_name) { + /* v3 and earlier */ + if (len == CE_NAMEMASK) + len = strlen(name); + ce = cache_entry_from_ondisk(ondisk, flags, name, len); + + *ent_size = ondisk_ce_size(ce); + } else { + unsigned long consumed; + consumed = expand_name_field(previous_name, name); + ce = cache_entry_from_ondisk(ondisk, flags, + previous_name->buf, + previous_name->len); + + *ent_size = (name - ((char *)ondisk)) + consumed; + } + return ce; } /* remember to discard_cache() before reading a different cache! */ @@ -1266,16 +1429,15 @@ int read_index_from(struct index_state *istate, const char *path) { int fd, i; struct stat st; - unsigned long src_offset, dst_offset; + unsigned long src_offset; struct cache_header *hdr; void *mmap; size_t mmap_size; + struct strbuf previous_name_buf = STRBUF_INIT, *previous_name; - errno = EBUSY; if (istate->initialized) return istate->cache_nr; - errno = ENOENT; istate->timestamp.sec = 0; istate->timestamp.nsec = 0; fd = open(path, O_RDONLY); @@ -1288,47 +1450,43 @@ int read_index_from(struct index_state *istate, const char *path) if (fstat(fd, &st)) die_errno("cannot stat the open index"); - errno = EINVAL; mmap_size = xsize_t(st.st_size); if (mmap_size < sizeof(struct cache_header) + 20) die("index file smaller than expected"); mmap = xmmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); - close(fd); if (mmap == MAP_FAILED) die_errno("unable to map index file"); + close(fd); hdr = mmap; if (verify_hdr(hdr, mmap_size) < 0) goto unmap; + istate->version = ntohl(hdr->hdr_version); 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 *)); - - /* - * 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(estimate_cache_size(mmap_size, istate->cache_nr)); + istate->cache = xcalloc(istate->cache_alloc, sizeof(*istate->cache)); istate->initialized = 1; + if (istate->version == 4) + previous_name = &previous_name_buf; + else + previous_name = NULL; + 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; + unsigned long consumed; 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); + ce = create_from_disk(disk_ce, &consumed, previous_name); set_index_entry(istate, i, ce); - src_offset += ondisk_ce_size(ce); - dst_offset += ce_size(ce); + src_offset += consumed; } + strbuf_release(&previous_name_buf); istate->timestamp.sec = st.st_mtime; istate->timestamp.nsec = ST_MTIME_NSEC(st); @@ -1355,30 +1513,31 @@ int read_index_from(struct index_state *istate, const char *path) unmap: munmap(mmap, mmap_size); - errno = EINVAL; die("index file corrupt"); } int is_index_unborn(struct index_state *istate) { - return (!istate->cache_nr && !istate->alloc && !istate->timestamp.sec); + return (!istate->cache_nr && !istate->timestamp.sec); } int discard_index(struct index_state *istate) { + int i; + + for (i = 0; i < istate->cache_nr; i++) + free(istate->cache[i]); resolve_undo_clear_index(istate); istate->cache_nr = 0; istate->cache_changed = 0; istate->timestamp.sec = 0; istate->timestamp.nsec = 0; - istate->name_hash_initialized = 0; - free_hash(&istate->name_hash); + free_name_hash(istate); cache_tree_free(&(istate->cache_tree)); - free(istate->alloc); - istate->alloc = NULL; istate->initialized = 0; - - /* no need to throw away allocated active_cache */ + free(istate->cache); + istate->cache = NULL; + istate->cache_alloc = 0; return 0; } @@ -1467,7 +1626,7 @@ static void ce_smudge_racily_clean_entry(struct cache_entry *ce) * The only thing we care about in this function is to smudge the * falsely clean entry due to touch-update-touch race, so we leave * everything else as they are. We are called for entries whose - * ce_mtime match the index file mtime. + * ce_stat_data.sd_mtime match the index file mtime. * * Note that this actually does not do much for gitlinks, for * which ce_match_stat_basic() always goes to the actual @@ -1506,38 +1665,81 @@ 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 = 0; + ce->ce_stat_data.sd_size = 0; } } -static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce) +/* Copy miscellaneous fields but not the name */ +static char *copy_cache_entry_to_ondisk(struct ondisk_cache_entry *ondisk, + struct cache_entry *ce) { - int size = ondisk_ce_size(ce); - struct ondisk_cache_entry *ondisk = xcalloc(1, size); - char *name; - int result; - - ondisk->ctime.sec = htonl(ce->ce_ctime.sec); - ondisk->mtime.sec = htonl(ce->ce_mtime.sec); - ondisk->ctime.nsec = htonl(ce->ce_ctime.nsec); - ondisk->mtime.nsec = htonl(ce->ce_mtime.nsec); - ondisk->dev = htonl(ce->ce_dev); - ondisk->ino = htonl(ce->ce_ino); + short flags; + + ondisk->ctime.sec = htonl(ce->ce_stat_data.sd_ctime.sec); + ondisk->mtime.sec = htonl(ce->ce_stat_data.sd_mtime.sec); + ondisk->ctime.nsec = htonl(ce->ce_stat_data.sd_ctime.nsec); + ondisk->mtime.nsec = htonl(ce->ce_stat_data.sd_mtime.nsec); + ondisk->dev = htonl(ce->ce_stat_data.sd_dev); + ondisk->ino = htonl(ce->ce_stat_data.sd_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); + ondisk->uid = htonl(ce->ce_stat_data.sd_uid); + ondisk->gid = htonl(ce->ce_stat_data.sd_gid); + ondisk->size = htonl(ce->ce_stat_data.sd_size); hashcpy(ondisk->sha1, ce->sha1); - ondisk->flags = htons(ce->ce_flags); + + flags = ce->ce_flags; + flags |= (ce_namelen(ce) >= CE_NAMEMASK ? CE_NAMEMASK : ce_namelen(ce)); + ondisk->flags = htons(flags); if (ce->ce_flags & CE_EXTENDED) { struct ondisk_cache_entry_extended *ondisk2; ondisk2 = (struct ondisk_cache_entry_extended *)ondisk; ondisk2->flags2 = htons((ce->ce_flags & CE_EXTENDED_FLAGS) >> 16); - name = ondisk2->name; + return ondisk2->name; + } + else { + return ondisk->name; + } +} + +static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce, + struct strbuf *previous_name) +{ + int size; + struct ondisk_cache_entry *ondisk; + char *name; + int result; + + if (!previous_name) { + size = ondisk_ce_size(ce); + ondisk = xcalloc(1, size); + name = copy_cache_entry_to_ondisk(ondisk, ce); + memcpy(name, ce->name, ce_namelen(ce)); + } else { + int common, to_remove, prefix_size; + unsigned char to_remove_vi[16]; + for (common = 0; + (ce->name[common] && + common < previous_name->len && + ce->name[common] == previous_name->buf[common]); + common++) + ; /* still matching */ + to_remove = previous_name->len - common; + prefix_size = encode_varint(to_remove, to_remove_vi); + + if (ce->ce_flags & CE_EXTENDED) + size = offsetof(struct ondisk_cache_entry_extended, name); + else + size = offsetof(struct ondisk_cache_entry, name); + size += prefix_size + (ce_namelen(ce) - common + 1); + + ondisk = xcalloc(1, size); + name = copy_cache_entry_to_ondisk(ondisk, ce); + memcpy(name, to_remove_vi, prefix_size); + memcpy(name + prefix_size, ce->name + common, ce_namelen(ce) - common); + + strbuf_splice(previous_name, common, to_remove, + ce->name + common, ce_namelen(ce) - common); } - else - name = ondisk->name; - memcpy(name, ce->name, ce_namelen(ce)); result = ce_write(c, fd, ondisk, size); free(ondisk); @@ -1558,7 +1760,7 @@ static int has_racy_timestamp(struct index_state *istate) } /* - * Opportunisticly update the index but do not complain if we can't + * Opportunistically update the index but do not complain if we can't */ void update_index_if_able(struct index_state *istate, struct lock_file *lockfile) { @@ -1573,10 +1775,11 @@ int write_index(struct index_state *istate, int newfd) { git_SHA_CTX c; struct cache_header hdr; - int i, err, removed, extended; + int i, err, removed, extended, hdr_version; struct cache_entry **cache = istate->cache; int entries = istate->cache_nr; struct stat st; + struct strbuf previous_name_buf = STRBUF_INIT, *previous_name; for (i = removed = extended = 0; i < entries; i++) { if (cache[i]->ce_flags & CE_REMOVE) @@ -1590,24 +1793,36 @@ int write_index(struct index_state *istate, int newfd) } } + if (!istate->version) + istate->version = INDEX_FORMAT_DEFAULT; + + /* demote version 3 to version 2 when the latter suffices */ + if (istate->version == 3 || istate->version == 2) + istate->version = extended ? 3 : 2; + + hdr_version = istate->version; + hdr.hdr_signature = htonl(CACHE_SIGNATURE); - /* for extended format, increase version so older git won't try to read it */ - hdr.hdr_version = htonl(extended ? 3 : 2); + hdr.hdr_version = htonl(hdr_version); hdr.hdr_entries = htonl(entries - removed); git_SHA1_Init(&c); if (ce_write(&c, newfd, &hdr, sizeof(hdr)) < 0) return -1; + previous_name = (hdr_version == 4) ? &previous_name_buf : NULL; for (i = 0; i < entries; i++) { struct cache_entry *ce = cache[i]; if (ce->ce_flags & CE_REMOVE) continue; if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce)) ce_smudge_racily_clean_entry(ce); - if (ce_write_entry(&c, newfd, ce) < 0) + if (is_null_sha1(ce->sha1)) + return error("cache entry has null sha1: %s", ce->name); + if (ce_write_entry(&c, newfd, ce, previous_name) < 0) return -1; } + strbuf_release(&previous_name_buf); /* Write extension data here */ if (istate->cache_tree) { @@ -1660,11 +1875,12 @@ int read_index_unmerged(struct index_state *istate) if (!ce_stage(ce)) continue; unmerged = 1; - len = strlen(ce->name); + len = ce_namelen(ce); size = cache_entry_size(len); new_ce = xcalloc(1, size); memcpy(new_ce->name, ce->name, len); - new_ce->ce_flags = create_ce_flags(len, 0) | CE_CONFLICTED; + new_ce->ce_flags = create_ce_flags(0) | CE_CONFLICTED; + new_ce->ce_namelen = len; new_ce->ce_mode = ce->ce_mode; if (add_index_entry(istate, new_ce, 0)) return error("%s: cannot drop to stage #0", @@ -1701,3 +1917,67 @@ int index_name_is_other(const struct index_state *istate, const char *name, } return 1; } + +void *read_blob_data_from_index(struct index_state *istate, const char *path, unsigned long *size) +{ + int pos, len; + unsigned long sz; + enum object_type type; + void *data; + + len = strlen(path); + pos = index_name_pos(istate, path, len); + if (pos < 0) { + /* + * We might be in the middle of a merge, in which + * case we would read stage #2 (ours). + */ + int i; + for (i = -pos - 1; + (pos < 0 && i < istate->cache_nr && + !strcmp(istate->cache[i]->name, path)); + i++) + if (ce_stage(istate->cache[i]) == 2) + pos = i; + } + if (pos < 0) + return NULL; + data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz); + if (!data || type != OBJ_BLOB) { + free(data); + return NULL; + } + if (size) + *size = sz; + return data; +} + +void stat_validity_clear(struct stat_validity *sv) +{ + free(sv->sd); + sv->sd = NULL; +} + +int stat_validity_check(struct stat_validity *sv, const char *path) +{ + struct stat st; + + if (stat(path, &st) < 0) + return sv->sd == NULL; + if (!sv->sd) + return 0; + return S_ISREG(st.st_mode) && !match_stat_data(sv->sd, &st); +} + +void stat_validity_update(struct stat_validity *sv, int fd) +{ + struct stat st; + + if (fstat(fd, &st) < 0 || !S_ISREG(st.st_mode)) + stat_validity_clear(sv); + else { + if (!sv->sd) + sv->sd = xcalloc(1, sizeof(struct stat_data)); + fill_stat_data(sv->sd, &st); + } +} |