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authorLinus Torvalds <torvalds@linux-foundation.org>2020-02-14 14:42:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-02-14 14:42:31 -0800
commitcf556edfde6cfc293ce63de02ac23f725e41dfb1 (patch)
tree4e888c8415c948f0278ed14af4c7c4f35edd5397
parentca60ad6a6bc4aa88c02c6f103dd80df54689ea4d (diff)
parent3b20bc2fe4c0cfd82d35838965dc7ff0b93415c6 (diff)
Merge tag 'ceph-for-5.6-rc2' of https://github.com/ceph/ceph-client
Pull ceph fixes from Ilya Dryomov: - make O_DIRECT | O_APPEND combination work better - redo the server path canonicalization patch that went into -rc1 - fix the 'noacl' mount option that got broken by the conversion to the new mount API in 5.5 * tag 'ceph-for-5.6-rc2' of https://github.com/ceph/ceph-client: ceph: noacl mount option is effectively ignored ceph: canonicalize server path in place ceph: do not execute direct write in parallel if O_APPEND is specified
-rw-r--r--fs/ceph/file.c17
-rw-r--r--fs/ceph/super.c129
-rw-r--r--fs/ceph/super.h2
3 files changed, 44 insertions, 104 deletions
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index c3b8e8e0bf17..7e0190b1f821 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1418,6 +1418,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct ceph_cap_flush *prealloc_cf;
ssize_t count, written = 0;
int err, want, got;
+ bool direct_lock = false;
loff_t pos;
loff_t limit = max(i_size_read(inode), fsc->max_file_size);
@@ -1428,8 +1429,11 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (!prealloc_cf)
return -ENOMEM;
+ if ((iocb->ki_flags & (IOCB_DIRECT | IOCB_APPEND)) == IOCB_DIRECT)
+ direct_lock = true;
+
retry_snap:
- if (iocb->ki_flags & IOCB_DIRECT)
+ if (direct_lock)
ceph_start_io_direct(inode);
else
ceph_start_io_write(inode);
@@ -1519,14 +1523,15 @@ retry_snap:
/* we might need to revert back to that point */
data = *from;
- if (iocb->ki_flags & IOCB_DIRECT) {
+ if (iocb->ki_flags & IOCB_DIRECT)
written = ceph_direct_read_write(iocb, &data, snapc,
&prealloc_cf);
- ceph_end_io_direct(inode);
- } else {
+ else
written = ceph_sync_write(iocb, &data, pos, snapc);
+ if (direct_lock)
+ ceph_end_io_direct(inode);
+ else
ceph_end_io_write(inode);
- }
if (written > 0)
iov_iter_advance(from, written);
ceph_put_snap_context(snapc);
@@ -1577,7 +1582,7 @@ retry_snap:
goto out_unlocked;
out:
- if (iocb->ki_flags & IOCB_DIRECT)
+ if (direct_lock)
ceph_end_io_direct(inode);
else
ceph_end_io_write(inode);
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 1d9f083b8a11..c7f150686a53 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -203,6 +203,26 @@ struct ceph_parse_opts_ctx {
};
/*
+ * Remove adjacent slashes and then the trailing slash, unless it is
+ * the only remaining character.
+ *
+ * E.g. "//dir1////dir2///" --> "/dir1/dir2", "///" --> "/".
+ */
+static void canonicalize_path(char *path)
+{
+ int i, j = 0;
+
+ for (i = 0; path[i] != '\0'; i++) {
+ if (path[i] != '/' || j < 1 || path[j - 1] != '/')
+ path[j++] = path[i];
+ }
+
+ if (j > 1 && path[j - 1] == '/')
+ j--;
+ path[j] = '\0';
+}
+
+/*
* Parse the source parameter. Distinguish the server list from the path.
*
* The source will look like:
@@ -224,15 +244,16 @@ static int ceph_parse_source(struct fs_parameter *param, struct fs_context *fc)
dev_name_end = strchr(dev_name, '/');
if (dev_name_end) {
- kfree(fsopt->server_path);
-
/*
* The server_path will include the whole chars from userland
* including the leading '/'.
*/
+ kfree(fsopt->server_path);
fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL);
if (!fsopt->server_path)
return -ENOMEM;
+
+ canonicalize_path(fsopt->server_path);
} else {
dev_name_end = dev_name + strlen(dev_name);
}
@@ -456,73 +477,6 @@ static int strcmp_null(const char *s1, const char *s2)
return strcmp(s1, s2);
}
-/**
- * path_remove_extra_slash - Remove the extra slashes in the server path
- * @server_path: the server path and could be NULL
- *
- * Return NULL if the path is NULL or only consists of "/", or a string
- * without any extra slashes including the leading slash(es) and the
- * slash(es) at the end of the server path, such as:
- * "//dir1////dir2///" --> "dir1/dir2"
- */
-static char *path_remove_extra_slash(const char *server_path)
-{
- const char *path = server_path;
- const char *cur, *end;
- char *buf, *p;
- int len;
-
- /* if the server path is omitted */
- if (!path)
- return NULL;
-
- /* remove all the leading slashes */
- while (*path == '/')
- path++;
-
- /* if the server path only consists of slashes */
- if (*path == '\0')
- return NULL;
-
- len = strlen(path);
-
- buf = kmalloc(len + 1, GFP_KERNEL);
- if (!buf)
- return ERR_PTR(-ENOMEM);
-
- end = path + len;
- p = buf;
- do {
- cur = strchr(path, '/');
- if (!cur)
- cur = end;
-
- len = cur - path;
-
- /* including one '/' */
- if (cur != end)
- len += 1;
-
- memcpy(p, path, len);
- p += len;
-
- while (cur <= end && *cur == '/')
- cur++;
- path = cur;
- } while (path < end);
-
- *p = '\0';
-
- /*
- * remove the last slash if there has and just to make sure that
- * we will get something like "dir1/dir2"
- */
- if (*(--p) == '/')
- *p = '\0';
-
- return buf;
-}
-
static int compare_mount_options(struct ceph_mount_options *new_fsopt,
struct ceph_options *new_opt,
struct ceph_fs_client *fsc)
@@ -530,7 +484,6 @@ static int compare_mount_options(struct ceph_mount_options *new_fsopt,
struct ceph_mount_options *fsopt1 = new_fsopt;
struct ceph_mount_options *fsopt2 = fsc->mount_options;
int ofs = offsetof(struct ceph_mount_options, snapdir_name);
- char *p1, *p2;
int ret;
ret = memcmp(fsopt1, fsopt2, ofs);
@@ -540,21 +493,12 @@ static int compare_mount_options(struct ceph_mount_options *new_fsopt,
ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name);
if (ret)
return ret;
+
ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace);
if (ret)
return ret;
- p1 = path_remove_extra_slash(fsopt1->server_path);
- if (IS_ERR(p1))
- return PTR_ERR(p1);
- p2 = path_remove_extra_slash(fsopt2->server_path);
- if (IS_ERR(p2)) {
- kfree(p1);
- return PTR_ERR(p2);
- }
- ret = strcmp_null(p1, p2);
- kfree(p1);
- kfree(p2);
+ ret = strcmp_null(fsopt1->server_path, fsopt2->server_path);
if (ret)
return ret;
@@ -957,7 +901,9 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
mutex_lock(&fsc->client->mount_mutex);
if (!fsc->sb->s_root) {
- const char *path, *p;
+ const char *path = fsc->mount_options->server_path ?
+ fsc->mount_options->server_path + 1 : "";
+
err = __ceph_open_session(fsc->client, started);
if (err < 0)
goto out;
@@ -969,22 +915,11 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
goto out;
}
- p = path_remove_extra_slash(fsc->mount_options->server_path);
- if (IS_ERR(p)) {
- err = PTR_ERR(p);
- goto out;
- }
- /* if the server path is omitted or just consists of '/' */
- if (!p)
- path = "";
- else
- path = p;
dout("mount opening path '%s'\n", path);
ceph_fs_debugfs_init(fsc);
root = open_root_dentry(fsc, path, started);
- kfree(p);
if (IS_ERR(root)) {
err = PTR_ERR(root);
goto out;
@@ -1097,10 +1032,6 @@ static int ceph_get_tree(struct fs_context *fc)
if (!fc->source)
return invalfc(fc, "No source");
-#ifdef CONFIG_CEPH_FS_POSIX_ACL
- fc->sb_flags |= SB_POSIXACL;
-#endif
-
/* create client (which we may/may not use) */
fsc = create_fs_client(pctx->opts, pctx->copts);
pctx->opts = NULL;
@@ -1223,6 +1154,10 @@ static int ceph_init_fs_context(struct fs_context *fc)
fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT;
fsopt->congestion_kb = default_congestion_kb();
+#ifdef CONFIG_CEPH_FS_POSIX_ACL
+ fc->sb_flags |= SB_POSIXACL;
+#endif
+
fc->fs_private = pctx;
fc->ops = &ceph_context_ops;
return 0;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 1e456a9011bb..037cdfb2ad4f 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -91,7 +91,7 @@ struct ceph_mount_options {
char *snapdir_name; /* default ".snap" */
char *mds_namespace; /* default NULL */
- char *server_path; /* default "/" */
+ char *server_path; /* default NULL (means "/") */
char *fscache_uniq; /* default NULL */
};