[PATCH] erofs-utils: unify the tree traversal for the rebuild mode
Gao Xiang
hsiangkao at linux.alibaba.com
Wed May 15 18:41:56 AEST 2024
Let's drop the legacy approach and `tarerofs` will be applied too.
Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>
---
include/erofs/internal.h | 7 +-
lib/diskbuf.c | 14 +-
lib/inode.c | 384 ++++++++++++++++++++++-----------------
3 files changed, 232 insertions(+), 173 deletions(-)
diff --git a/include/erofs/internal.h b/include/erofs/internal.h
index ecbbdf6..46345e0 100644
--- a/include/erofs/internal.h
+++ b/include/erofs/internal.h
@@ -290,7 +290,12 @@ static inline unsigned int erofs_inode_datalayout(unsigned int value)
EROFS_I_DATALAYOUT_BITS);
}
-#define IS_ROOT(x) ((x) == (x)->i_parent)
+static inline struct erofs_inode *erofs_parent_inode(struct erofs_inode *inode)
+{
+ return (void *)((unsigned long)inode->i_parent & ~1UL);
+}
+
+#define IS_ROOT(x) ((x) == erofs_parent_inode(x))
struct erofs_dentry {
struct list_head d_child; /* child of parent list */
diff --git a/lib/diskbuf.c b/lib/diskbuf.c
index 8205ba5..e5889df 100644
--- a/lib/diskbuf.c
+++ b/lib/diskbuf.c
@@ -10,7 +10,7 @@
/* A simple approach to avoid creating too many temporary files */
static struct erofs_diskbufstrm {
- u64 count;
+ erofs_atomic_t count;
u64 tailoffset, devpos;
int fd;
unsigned int alignsize;
@@ -25,8 +25,6 @@ int erofs_diskbuf_getfd(struct erofs_diskbuf *db, u64 *fpos)
if (!strm)
return -1;
offset = db->offset + strm->devpos;
- if (lseek(strm->fd, offset, SEEK_SET) != offset)
- return -E2BIG;
if (fpos)
*fpos = offset;
return strm->fd;
@@ -46,7 +44,7 @@ int erofs_diskbuf_reserve(struct erofs_diskbuf *db, int sid, u64 *off)
if (off)
*off = db->offset + strm->devpos;
db->sp = strm;
- ++strm->count;
+ (void)erofs_atomic_inc_return(&strm->count);
strm->locked = true; /* TODO: need a real lock for MT */
return strm->fd;
}
@@ -66,8 +64,8 @@ void erofs_diskbuf_close(struct erofs_diskbuf *db)
struct erofs_diskbufstrm *strm = db->sp;
DBG_BUGON(!strm);
- DBG_BUGON(strm->count <= 1);
- --strm->count;
+ DBG_BUGON(erofs_atomic_read(&strm->count) <= 1);
+ (void)erofs_atomic_dec_return(&strm->count);
db->sp = NULL;
}
@@ -122,7 +120,7 @@ int erofs_diskbuf_init(unsigned int nstrms)
return -ENOSPC;
setupone:
strm->tailoffset = 0;
- strm->count = 1;
+ erofs_atomic_set(&strm->count, 1);
if (fstat(strm->fd, &st))
return -errno;
strm->alignsize = max_t(u32, st.st_blksize, getpagesize());
@@ -138,7 +136,7 @@ void erofs_diskbuf_exit(void)
return;
for (strm = dbufstrm; strm->fd >= 0; ++strm) {
- DBG_BUGON(strm->count != 1);
+ DBG_BUGON(erofs_atomic_read(&strm->count) != 1);
close(strm->fd);
strm->fd = -1;
diff --git a/lib/inode.c b/lib/inode.c
index 44d684f..8ec87e6 100644
--- a/lib/inode.c
+++ b/lib/inode.c
@@ -264,7 +264,7 @@ int erofs_init_empty_dir(struct erofs_inode *dir)
d = erofs_d_alloc(dir, "..");
if (IS_ERR(d))
return PTR_ERR(d);
- d->inode = erofs_igrab(dir->i_parent);
+ d->inode = erofs_igrab(erofs_parent_inode(dir));
d->type = EROFS_FT_DIR;
dir->i_nlink = 2;
@@ -494,29 +494,6 @@ int erofs_write_unencoded_file(struct erofs_inode *inode, int fd, u64 fpos)
return write_uncompressed_file_from_fd(inode, fd);
}
-int erofs_write_file(struct erofs_inode *inode, int fd, u64 fpos)
-{
- DBG_BUGON(!inode->i_size);
-
- if (cfg.c_compr_opts[0].alg && erofs_file_is_compressible(inode)) {
- void *ictx;
- int ret;
-
- ictx = erofs_begin_compressed_file(inode, fd, fpos);
- if (IS_ERR(ictx))
- return PTR_ERR(ictx);
-
- ret = erofs_write_compressed_file(ictx);
- if (ret != -ENOSPC)
- return ret;
-
- if (lseek(fd, fpos, SEEK_SET) < 0)
- return -errno;
- }
- /* fallback to all data uncompressed */
- return erofs_write_unencoded_file(inode, fd, fpos);
-}
-
static int erofs_bh_flush_write_inode(struct erofs_buffer_head *bh)
{
struct erofs_inode *const inode = bh->fsprivate;
@@ -1113,6 +1090,7 @@ struct erofs_mkfs_job_ndir_ctx {
struct erofs_inode *inode;
void *ictx;
int fd;
+ u64 fpos;
};
static int erofs_mkfs_job_write_file(struct erofs_mkfs_job_ndir_ctx *ctx)
@@ -1121,18 +1099,31 @@ static int erofs_mkfs_job_write_file(struct erofs_mkfs_job_ndir_ctx *ctx)
int ret;
if (ctx->ictx) {
+ if (inode->with_diskbuf &&
+ lseek(ctx->fd, ctx->fpos, SEEK_SET) < 0) {
+ ret = -errno;
+ goto out;
+ }
+
ret = erofs_write_compressed_file(ctx->ictx);
if (ret != -ENOSPC)
goto out;
- if (lseek(ctx->fd, 0, SEEK_SET) < 0) {
+ if (lseek(ctx->fd, ctx->fpos, SEEK_SET) < 0) {
ret = -errno;
goto out;
}
}
/* fallback to all data uncompressed */
- ret = erofs_write_unencoded_file(inode, ctx->fd, 0);
+ ret = erofs_write_unencoded_file(inode, ctx->fd, ctx->fpos);
out:
- close(ctx->fd);
+ if (inode->with_diskbuf) {
+ erofs_diskbuf_close(inode->i_diskbuf);
+ free(inode->i_diskbuf);
+ inode->i_diskbuf = NULL;
+ inode->with_diskbuf = false;
+ } else {
+ close(ctx->fd);
+ }
return ret;
}
@@ -1142,17 +1133,21 @@ static int erofs_mkfs_handle_nondirectory(struct erofs_mkfs_job_ndir_ctx *ctx)
int ret = 0;
if (S_ISLNK(inode->i_mode)) {
- char *const symlink = malloc(inode->i_size);
-
- if (!symlink)
- return -ENOMEM;
- ret = readlink(inode->i_srcpath, symlink, inode->i_size);
- if (ret < 0) {
- free(symlink);
- return -errno;
+ char *symlink = inode->i_link;
+
+ if (!symlink) {
+ symlink = malloc(inode->i_size);
+ if (!symlink)
+ return -ENOMEM;
+ ret = readlink(inode->i_srcpath, symlink, inode->i_size);
+ if (ret < 0) {
+ free(symlink);
+ return -errno;
+ }
}
ret = erofs_write_file_from_buffer(inode, symlink);
free(symlink);
+ inode->i_link = NULL;
} else if (inode->i_size) {
ret = erofs_mkfs_job_write_file(ctx);
}
@@ -1371,6 +1366,43 @@ err_closedir:
return ret;
}
+static int erofs_rebuild_handle_directory(struct erofs_inode *dir)
+{
+ struct erofs_dentry *d, *n;
+ unsigned int nr_subdirs, i_nlink;
+ int ret;
+
+ nr_subdirs = 0;
+ i_nlink = 2;
+ list_for_each_entry_safe(d, n, &dir->i_subdirs, d_child) {
+ if (cfg.c_ovlfs_strip && erofs_inode_is_whiteout(d->inode)) {
+ erofs_dbg("remove whiteout %s", d->inode->i_srcpath);
+ list_del(&d->d_child);
+ erofs_d_invalidate(d);
+ free(d);
+ continue;
+ }
+ i_nlink += S_ISDIR(d->inode->i_mode);
+ ++nr_subdirs;
+ }
+
+ ret = erofs_prepare_dir_layout(dir, nr_subdirs);
+ if (ret)
+ return ret;
+
+ /*
+ * if there're too many subdirs as compact form, set nlink=1
+ * rather than upgrade to use extented form instead.
+ */
+ if (i_nlink > USHRT_MAX &&
+ dir->inode_isize == sizeof(struct erofs_inode_compact))
+ dir->i_nlink = 1;
+ else
+ dir->i_nlink = i_nlink;
+
+ return erofs_mkfs_go(dir->sbi, EROFS_MKFS_JOB_DIR, &dir, sizeof(dir));
+}
+
static int erofs_mkfs_handle_inode(struct erofs_inode *inode)
{
char *trimmed;
@@ -1415,27 +1447,89 @@ static int erofs_mkfs_handle_inode(struct erofs_inode *inode)
return ret;
}
-#ifndef EROFS_MT_ENABLED
-#define __erofs_mkfs_build_tree_from_path erofs_mkfs_build_tree_from_path
-#endif
+static int erofs_rebuild_handle_inode(struct erofs_inode *inode)
+{
+ char *trimmed;
+ int ret;
+
+ trimmed = erofs_trim_for_progressinfo(erofs_fspath(inode->i_srcpath),
+ sizeof("Processing ...") - 1);
+ erofs_update_progressinfo("Processing %s ...", trimmed);
+ free(trimmed);
+
+ if (erofs_should_use_inode_extended(inode)) {
+ if (cfg.c_force_inodeversion == FORCE_INODE_COMPACT) {
+ erofs_err("file %s cannot be in compact form",
+ inode->i_srcpath);
+ return -EINVAL;
+ }
+ inode->inode_isize = sizeof(struct erofs_inode_extended);
+ } else {
+ inode->inode_isize = sizeof(struct erofs_inode_compact);
+ }
+
+ /* strip all unnecessary overlayfs xattrs when ovlfs_strip is enabled */
+ if (cfg.c_ovlfs_strip)
+ erofs_clear_opaque_xattr(inode);
+ else if (inode->whiteouts)
+ erofs_set_origin_xattr(inode);
+
+ ret = erofs_prepare_xattr_ibody(inode);
+ if (ret < 0)
+ return ret;
+
+ if (!S_ISDIR(inode->i_mode)) {
+ struct erofs_mkfs_job_ndir_ctx ctx = { .inode = inode };
-struct erofs_inode *__erofs_mkfs_build_tree_from_path(const char *path)
+ if (!S_ISLNK(inode->i_mode) && inode->i_size) {
+ DBG_BUGON(!inode->with_diskbuf);
+ ctx.fd = erofs_diskbuf_getfd(inode->i_diskbuf, &ctx.fpos);
+ if (ctx.fd < 0)
+ return ret;
+
+ if (cfg.c_compr_opts[0].alg &&
+ erofs_file_is_compressible(inode)) {
+ ctx.ictx = erofs_begin_compressed_file(inode,
+ ctx.fd, ctx.fpos);
+ if (IS_ERR(ctx.ictx))
+ return PTR_ERR(ctx.ictx);
+ }
+ }
+ ret = erofs_mkfs_go(inode->sbi, EROFS_MKFS_JOB_NDIR,
+ &ctx, sizeof(ctx));
+ } else {
+ ret = erofs_rebuild_handle_directory(inode);
+ }
+ erofs_info("file %s dumped (mode %05o)", erofs_fspath(inode->i_srcpath),
+ inode->i_mode);
+ return ret;
+}
+
+static bool erofs_inode_visited(struct erofs_inode *inode)
{
- struct erofs_inode *root, *dumpdir;
- int err;
+ return (unsigned long)inode->i_parent & 1UL;
+}
- root = erofs_iget_from_path(path, true);
- if (IS_ERR(root))
- return root;
+static void erofs_mark_parent_inode(struct erofs_inode *inode,
+ struct erofs_inode *dir)
+{
+ inode->i_parent = (void *)((unsigned long)dir | 1);
+}
+
+static int erofs_mkfs_dump_tree(struct erofs_inode *root, bool rebuild)
+{
+ struct erofs_inode *dumpdir;
+ int err;
- root->i_parent = root; /* rootdir mark */
+ erofs_mark_parent_inode(root, root); /* rootdir mark */
root->next_dirwrite = NULL;
(void)erofs_igrab(root);
dumpdir = root;
- err = erofs_mkfs_handle_inode(root);
+ err = !rebuild ? erofs_mkfs_handle_inode(root) :
+ erofs_rebuild_handle_inode(root);
if (err)
- return ERR_PTR(err);
+ return err;
do {
int err;
@@ -1450,21 +1544,25 @@ struct erofs_inode *__erofs_mkfs_build_tree_from_path(const char *path)
if (is_dot_dotdot(d->name))
continue;
- if (inode->i_parent) {
- ++inode->i_nlink;
- } else {
- inode->i_parent = dir;
- err = erofs_mkfs_handle_inode(inode);
- if (err) {
- root = ERR_PTR(err);
+ if (!erofs_inode_visited(inode)) {
+ DBG_BUGON(rebuild &&
+ erofs_parent_inode(inode) != dir);
+ erofs_mark_parent_inode(inode, dir);
+
+ if (!rebuild)
+ err = erofs_mkfs_handle_inode(inode);
+ else
+ err = erofs_rebuild_handle_inode(inode);
+ if (err)
break;
- }
if (S_ISDIR(inode->i_mode)) {
*last = inode;
last = &inode->next_dirwrite;
(void)erofs_igrab(inode);
}
+ } else if (!rebuild) {
+ ++inode->i_nlink;
}
}
*last = dumpdir; /* fixup the last (or the only) one */
@@ -1472,28 +1570,61 @@ struct erofs_inode *__erofs_mkfs_build_tree_from_path(const char *path)
err = erofs_mkfs_go(dir->sbi, EROFS_MKFS_JOB_DIR_BH,
&dir, sizeof(dir));
if (err)
- return ERR_PTR(err);
+ return err;
} while (dumpdir);
- return root;
+ return err;
}
-#ifdef EROFS_MT_ENABLED
-struct erofs_inode *erofs_mkfs_build_tree_from_path(const char *path)
+struct erofs_mkfs_buildtree_ctx {
+ union {
+ const char *path;
+ struct erofs_inode *root;
+ } u;
+ bool from_path;
+};
+#ifndef EROFS_MT_ENABLED
+#define __erofs_mkfs_build_tree erofs_mkfs_build_tree
+#endif
+
+static int __erofs_mkfs_build_tree(struct erofs_mkfs_buildtree_ctx *ctx)
{
- struct erofs_mkfs_dfops *q;
struct erofs_inode *root;
int err;
+ if (ctx->from_path) {
+ root = erofs_iget_from_path(ctx->u.path, true);
+ if (IS_ERR(root))
+ return PTR_ERR(root);
+ } else {
+ root = ctx->u.root;
+ }
+
+ err = erofs_mkfs_dump_tree(root, !ctx->from_path);
+ if (err) {
+ if (ctx->from_path)
+ erofs_iput(root);
+ return err;
+ }
+ ctx->u.root = root;
+ return 0;
+}
+
+#ifdef EROFS_MT_ENABLED
+static int erofs_mkfs_build_tree(struct erofs_mkfs_buildtree_ctx *ctx)
+{
+ struct erofs_mkfs_dfops *q;
+ int err, err2;
+
q = malloc(sizeof(*q));
if (!q)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
q->entries = EROFS_MT_QUEUE_SIZE;
q->queue = malloc(q->entries * sizeof(*q->queue));
if (!q->queue) {
free(q);
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
}
pthread_mutex_init(&q->lock, NULL);
pthread_cond_init(&q->empty, NULL);
@@ -1506,10 +1637,12 @@ struct erofs_inode *erofs_mkfs_build_tree_from_path(const char *path)
z_erofs_mt_dfops_worker, &sbi);
if (err)
goto fail;
- root = __erofs_mkfs_build_tree_from_path(path);
+ err = __erofs_mkfs_build_tree(ctx);
erofs_mkfs_go(&sbi, ~0, NULL, 0);
- err = pthread_join(sbi.dfops_worker, NULL);
+ err2 = pthread_join(sbi.dfops_worker, NULL);
+ if (!err)
+ err = err2;
fail:
pthread_cond_destroy(&q->empty);
@@ -1517,10 +1650,32 @@ fail:
pthread_mutex_destroy(&q->lock);
free(q->queue);
free(q);
- return err ? ERR_PTR(err) : root;
+ return err;
}
#endif
+struct erofs_inode *erofs_mkfs_build_tree_from_path(const char *path)
+{
+ struct erofs_mkfs_buildtree_ctx ctx = {
+ .from_path = true,
+ .u.path = path,
+ };
+ int err;
+
+ err = erofs_mkfs_build_tree(&ctx);
+ if (err)
+ return ERR_PTR(err);
+ return ctx.u.root;
+}
+
+int erofs_rebuild_dump_tree(struct erofs_inode *root)
+{
+ return erofs_mkfs_build_tree(&((struct erofs_mkfs_buildtree_ctx) {
+ .from_path = false,
+ .u.root = root,
+ }));
+}
+
struct erofs_inode *erofs_mkfs_build_special_from_fd(int fd, const char *name)
{
struct stat st;
@@ -1578,102 +1733,3 @@ struct erofs_inode *erofs_mkfs_build_special_from_fd(int fd, const char *name)
erofs_write_tail_end(inode);
return inode;
}
-
-int erofs_rebuild_dump_tree(struct erofs_inode *dir)
-{
- struct erofs_dentry *d, *n;
- unsigned int nr_subdirs;
- int ret;
-
- if (erofs_should_use_inode_extended(dir)) {
- if (cfg.c_force_inodeversion == FORCE_INODE_COMPACT) {
- erofs_err("file %s cannot be in compact form",
- dir->i_srcpath);
- return -EINVAL;
- }
- dir->inode_isize = sizeof(struct erofs_inode_extended);
- } else {
- dir->inode_isize = sizeof(struct erofs_inode_compact);
- }
-
- /* strip all unnecessary overlayfs xattrs when ovlfs_strip is enabled */
- if (cfg.c_ovlfs_strip)
- erofs_clear_opaque_xattr(dir);
- else if (dir->whiteouts)
- erofs_set_origin_xattr(dir);
-
- ret = erofs_prepare_xattr_ibody(dir);
- if (ret < 0)
- return ret;
-
- if (!S_ISDIR(dir->i_mode)) {
- if (dir->bh)
- return 0;
- if (S_ISLNK(dir->i_mode)) {
- ret = erofs_write_file_from_buffer(dir, dir->i_link);
- free(dir->i_link);
- dir->i_link = NULL;
- } else if (dir->with_diskbuf) {
- u64 fpos;
-
- ret = erofs_diskbuf_getfd(dir->i_diskbuf, &fpos);
- if (ret >= 0)
- ret = erofs_write_file(dir, ret, fpos);
- erofs_diskbuf_close(dir->i_diskbuf);
- free(dir->i_diskbuf);
- dir->i_diskbuf = NULL;
- dir->with_diskbuf = false;
- } else {
- ret = 0;
- }
- if (ret)
- return ret;
- ret = erofs_prepare_inode_buffer(dir);
- if (ret)
- return ret;
- erofs_write_tail_end(dir);
- return 0;
- }
-
- nr_subdirs = 0;
- list_for_each_entry_safe(d, n, &dir->i_subdirs, d_child) {
- if (cfg.c_ovlfs_strip && erofs_inode_is_whiteout(d->inode)) {
- erofs_dbg("remove whiteout %s", d->inode->i_srcpath);
- list_del(&d->d_child);
- erofs_d_invalidate(d);
- free(d);
- continue;
- }
- ++nr_subdirs;
- }
-
- ret = erofs_prepare_dir_layout(dir, nr_subdirs);
- if (ret)
- return ret;
-
- ret = erofs_prepare_inode_buffer(dir);
- if (ret)
- return ret;
- dir->bh->op = &erofs_skip_write_bhops;
-
- if (IS_ROOT(dir))
- erofs_fixup_meta_blkaddr(dir);
-
- list_for_each_entry(d, &dir->i_subdirs, d_child) {
- struct erofs_inode *inode;
-
- if (is_dot_dotdot(d->name))
- continue;
-
- inode = erofs_igrab(d->inode);
- ret = erofs_rebuild_dump_tree(inode);
- dir->i_nlink += (erofs_mode_to_ftype(inode->i_mode) == EROFS_FT_DIR);
- erofs_iput(inode);
- if (ret)
- return ret;
- }
- erofs_write_dir_file(dir);
- erofs_write_tail_end(dir);
- dir->bh->op = &erofs_write_inode_bhops;
- return 0;
-}
--
2.39.3
More information about the Linux-erofs
mailing list