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authorLinus Torvalds <torvalds@linux-foundation.org>2009-06-17 09:46:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-17 09:46:33 -0700
commitb7c142dbf1e7422d0be7f7faa3f1163ad9da9788 (patch)
tree6e62c8654bb9c329f89246235062ac2a289960df /fs
parent0bd8df908de2aefe312d05bd25cd3abc21a6d1da (diff)
parentf2c5dbd7b7396457efc114f825acfdd4db4608f8 (diff)
downloadlinux-b7c142dbf1e7422d0be7f7faa3f1163ad9da9788.tar.gz
Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6
* 'linux-next' of git://git.infradead.org/ubifs-2.6: UBIFS: start using hrtimers hrtimer: export ktime_add_safe UBIFS: do not forget to register BDI device UBIFS: allow sync option in rootflags UBIFS: remove dead code UBIFS: use anonymous device UBIFS: return proper error code if the compr is not present UBIFS: return error if link and unlink race UBIFS: reset no_space flag after inode deletion
Diffstat (limited to 'fs')
-rw-r--r--fs/ubifs/budget.c4
-rw-r--r--fs/ubifs/dir.c19
-rw-r--r--fs/ubifs/io.c34
-rw-r--r--fs/ubifs/recovery.c31
-rw-r--r--fs/ubifs/super.c73
-rw-r--r--fs/ubifs/ubifs.h13
6 files changed, 102 insertions, 72 deletions
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index af1914462f0..eaf6d891d46 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -91,7 +91,6 @@ static int shrink_liability(struct ubifs_info *c, int nr_to_write)
return nr_written;
}
-
/**
* run_gc - run garbage collector.
* @c: UBIFS file-system description object
@@ -628,7 +627,7 @@ void ubifs_convert_page_budget(struct ubifs_info *c)
*
* This function releases budget corresponding to a dirty inode. It is usually
* called when after the inode has been written to the media and marked as
- * clean.
+ * clean. It also causes the "no space" flags to be cleared.
*/
void ubifs_release_dirty_inode_budget(struct ubifs_info *c,
struct ubifs_inode *ui)
@@ -636,6 +635,7 @@ void ubifs_release_dirty_inode_budget(struct ubifs_info *c,
struct ubifs_budget_req req;
memset(&req, 0, sizeof(struct ubifs_budget_req));
+ /* The "no space" flags will be cleared because dd_growth is > 0 */
req.dd_growth = c->inode_budget + ALIGN(ui->data_len, 8);
ubifs_release_budget(c, &req);
}
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index f55d523c52b..552fb0111ff 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -528,6 +528,25 @@ static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
inode->i_nlink, dir->i_ino);
ubifs_assert(mutex_is_locked(&dir->i_mutex));
ubifs_assert(mutex_is_locked(&inode->i_mutex));
+
+ /*
+ * Return -ENOENT if we've raced with unlink and i_nlink is 0. Doing
+ * otherwise has the potential to corrupt the orphan inode list.
+ *
+ * Indeed, consider a scenario when 'vfs_link(dirA/fileA)' and
+ * 'vfs_unlink(dirA/fileA, dirB/fileB)' race. 'vfs_link()' does not
+ * lock 'dirA->i_mutex', so this is possible. Both of the functions
+ * lock 'fileA->i_mutex' though. Suppose 'vfs_unlink()' wins, and takes
+ * 'fileA->i_mutex' mutex first. Suppose 'fileA->i_nlink' is 1. In this
+ * case 'ubifs_unlink()' will drop the last reference, and put 'inodeA'
+ * to the list of orphans. After this, 'vfs_link()' will link
+ * 'dirB/fileB' to 'inodeA'. This is a problem because, for example,
+ * the subsequent 'vfs_unlink(dirB/fileB)' will add the same inode
+ * to the list of orphans.
+ */
+ if (inode->i_nlink == 0)
+ return -ENOENT;
+
err = dbg_check_synced_i_size(inode);
if (err)
return err;
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index e8e632a1dcd..bc5857199ec 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -293,13 +293,14 @@ void ubifs_prep_grp_node(struct ubifs_info *c, void *node, int len, int last)
*
* This function is called when the write-buffer timer expires.
*/
-static void wbuf_timer_callback_nolock(unsigned long data)
+static enum hrtimer_restart wbuf_timer_callback_nolock(struct hrtimer *timer)
{
- struct ubifs_wbuf *wbuf = (struct ubifs_wbuf *)data;
+ struct ubifs_wbuf *wbuf = container_of(timer, struct ubifs_wbuf, timer);
wbuf->need_sync = 1;
wbuf->c->need_wbuf_sync = 1;
ubifs_wake_up_bgt(wbuf->c);
+ return HRTIMER_NORESTART;
}
/**
@@ -308,13 +309,12 @@ static void wbuf_timer_callback_nolock(unsigned long data)
*/
static void new_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
{
- ubifs_assert(!timer_pending(&wbuf->timer));
+ ubifs_assert(!hrtimer_active(&wbuf->timer));
- if (!wbuf->timeout)
+ if (!ktime_to_ns(wbuf->softlimit))
return;
-
- wbuf->timer.expires = jiffies + wbuf->timeout;
- add_timer(&wbuf->timer);
+ hrtimer_start_range_ns(&wbuf->timer, wbuf->softlimit, wbuf->delta,
+ HRTIMER_MODE_REL);
}
/**
@@ -329,7 +329,7 @@ static void cancel_wbuf_timer_nolock(struct ubifs_wbuf *wbuf)
* should be canceled.
*/
wbuf->need_sync = 0;
- del_timer(&wbuf->timer);
+ hrtimer_cancel(&wbuf->timer);
}
/**
@@ -825,6 +825,7 @@ out:
int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
{
size_t size;
+ ktime_t hardlimit;
wbuf->buf = kmalloc(c->min_io_size, GFP_KERNEL);
if (!wbuf->buf)
@@ -845,14 +846,21 @@ int ubifs_wbuf_init(struct ubifs_info *c, struct ubifs_wbuf *wbuf)
wbuf->sync_callback = NULL;
mutex_init(&wbuf->io_mutex);
spin_lock_init(&wbuf->lock);
-
wbuf->c = c;
- init_timer(&wbuf->timer);
- wbuf->timer.function = wbuf_timer_callback_nolock;
- wbuf->timer.data = (unsigned long)wbuf;
- wbuf->timeout = DEFAULT_WBUF_TIMEOUT;
wbuf->next_ino = 0;
+ hrtimer_init(&wbuf->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ wbuf->timer.function = wbuf_timer_callback_nolock;
+ /*
+ * Make write-buffer soft limit to be 20% of the hard limit. The
+ * write-buffer timer is allowed to expire any time between the soft
+ * and hard limits.
+ */
+ hardlimit = ktime_set(DEFAULT_WBUF_TIMEOUT_SECS, 0);
+ wbuf->delta = (DEFAULT_WBUF_TIMEOUT_SECS * NSEC_PER_SEC) * 2 / 10;
+ wbuf->softlimit = ktime_sub_ns(hardlimit, wbuf->delta);
+ hrtimer_set_expires_range_ns(&wbuf->timer, wbuf->softlimit,
+ wbuf->delta);
return 0;
}
diff --git a/fs/ubifs/recovery.c b/fs/ubifs/recovery.c
index 10662975d2e..805605250f1 100644
--- a/fs/ubifs/recovery.c
+++ b/fs/ubifs/recovery.c
@@ -343,33 +343,15 @@ int ubifs_write_rcvrd_mst_node(struct ubifs_info *c)
*
* This function returns %1 if @offs was in the last write to the LEB whose data
* is in @buf, otherwise %0 is returned. The determination is made by checking
- * for subsequent empty space starting from the next min_io_size boundary (or a
- * bit less than the common header size if min_io_size is one).
+ * for subsequent empty space starting from the next @c->min_io_size boundary.
*/
static int is_last_write(const struct ubifs_info *c, void *buf, int offs)
{
- int empty_offs;
- int check_len;
+ int empty_offs, check_len;
uint8_t *p;
- if (c->min_io_size == 1) {
- check_len = c->leb_size - offs;
- p = buf + check_len;
- for (; check_len > 0; check_len--)
- if (*--p != 0xff)
- break;
- /*
- * 'check_len' is the size of the corruption which cannot be
- * more than the size of 1 node if it was caused by an unclean
- * unmount.
- */
- if (check_len > UBIFS_MAX_NODE_SZ)
- return 0;
- return 1;
- }
-
/*
- * Round up to the next c->min_io_size boundary i.e. 'offs' is in the
+ * Round up to the next @c->min_io_size boundary i.e. @offs is in the
* last wbuf written. After that should be empty space.
*/
empty_offs = ALIGN(offs + 1, c->min_io_size);
@@ -392,7 +374,7 @@ static int is_last_write(const struct ubifs_info *c, void *buf, int offs)
*
* This function pads up to the next min_io_size boundary (if there is one) and
* sets empty space to all 0xff. @buf, @offs and @len are updated to the next
- * min_io_size boundary (if there is one).
+ * @c->min_io_size boundary.
*/
static void clean_buf(const struct ubifs_info *c, void **buf, int lnum,
int *offs, int *len)
@@ -402,11 +384,6 @@ static void clean_buf(const struct ubifs_info *c, void **buf, int lnum,
lnum = lnum;
dbg_rcvry("cleaning corruption at %d:%d", lnum, *offs);
- if (c->min_io_size == 1) {
- memset(*buf, 0xff, c->leb_size - *offs);
- return;
- }
-
ubifs_assert(!(*offs & 7));
empty_offs = ALIGN(*offs, c->min_io_size);
pad_len = empty_offs - *offs;
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 3260b73abe2..79fad43f3c5 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -361,6 +361,11 @@ static void ubifs_delete_inode(struct inode *inode)
out:
if (ui->dirty)
ubifs_release_dirty_inode_budget(c, ui);
+ else {
+ /* We've deleted something - clean the "no space" flags */
+ c->nospace = c->nospace_rp = 0;
+ smp_wmb();
+ }
clear_inode(inode);
}
@@ -792,7 +797,7 @@ static int alloc_wbufs(struct ubifs_info *c)
* does not need to be synchronized by timer.
*/
c->jheads[GCHD].wbuf.dtype = UBI_LONGTERM;
- c->jheads[GCHD].wbuf.timeout = 0;
+ c->jheads[GCHD].wbuf.softlimit = ktime_set(0, 0);
return 0;
}
@@ -933,6 +938,27 @@ static const match_table_t tokens = {
};
/**
+ * parse_standard_option - parse a standard mount option.
+ * @option: the option to parse
+ *
+ * Normally, standard mount options like "sync" are passed to file-systems as
+ * flags. However, when a "rootflags=" kernel boot parameter is used, they may
+ * be present in the options string. This function tries to deal with this
+ * situation and parse standard options. Returns 0 if the option was not
+ * recognized, and the corresponding integer flag if it was.
+ *
+ * UBIFS is only interested in the "sync" option, so do not check for anything
+ * else.
+ */
+static int parse_standard_option(const char *option)
+{
+ ubifs_msg("parse %s", option);
+ if (!strcmp(option, "sync"))
+ return MS_SYNCHRONOUS;
+ return 0;
+}
+
+/**
* ubifs_parse_options - parse mount parameters.
* @c: UBIFS file-system description object
* @options: parameters to parse
@@ -1008,9 +1034,19 @@ static int ubifs_parse_options(struct ubifs_info *c, char *options,
break;
}
default:
- ubifs_err("unrecognized mount option \"%s\" "
- "or missing value", p);
- return -EINVAL;
+ {
+ unsigned long flag;
+ struct super_block *sb = c->vfs_sb;
+
+ flag = parse_standard_option(p);
+ if (!flag) {
+ ubifs_err("unrecognized mount option \"%s\" "
+ "or missing value", p);
+ return -EINVAL;
+ }
+ sb->s_flags |= flag;
+ break;
+ }
}
}
@@ -1180,6 +1216,7 @@ static int mount_ubifs(struct ubifs_info *c)
if (!ubifs_compr_present(c->default_compr)) {
ubifs_err("'compressor \"%s\" is not compiled in",
ubifs_compr_name(c->default_compr));
+ err = -ENOTSUPP;
goto out_free;
}
@@ -1656,7 +1693,7 @@ static void ubifs_remount_ro(struct ubifs_info *c)
for (i = 0; i < c->jhead_cnt; i++) {
ubifs_wbuf_sync(&c->jheads[i].wbuf);
- del_timer_sync(&c->jheads[i].wbuf.timer);
+ hrtimer_cancel(&c->jheads[i].wbuf.timer);
}
c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
@@ -1719,7 +1756,7 @@ static void ubifs_put_super(struct super_block *sb)
if (c->jheads)
for (i = 0; i < c->jhead_cnt; i++) {
ubifs_wbuf_sync(&c->jheads[i].wbuf);
- del_timer_sync(&c->jheads[i].wbuf.timer);
+ hrtimer_cancel(&c->jheads[i].wbuf.timer);
}
/*
@@ -1911,6 +1948,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
INIT_LIST_HEAD(&c->orph_list);
INIT_LIST_HEAD(&c->orph_new);
+ c->vfs_sb = sb;
c->highest_inum = UBIFS_FIRST_INO;
c->lhead_lnum = c->ltail_lnum = UBIFS_LOG_LNUM;
@@ -1945,13 +1983,10 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
if (err)
goto out_bdi;
- c->vfs_sb = sb;
-
sb->s_fs_info = c;
sb->s_magic = UBIFS_SUPER_MAGIC;
sb->s_blocksize = UBIFS_BLOCK_SIZE;
sb->s_blocksize_bits = UBIFS_BLOCK_SHIFT;
- sb->s_dev = c->vi.cdev;
sb->s_maxbytes = c->max_inode_sz = key_max_inode_size(c);
if (c->max_inode_sz > MAX_LFS_FILESIZE)
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
@@ -1996,16 +2031,9 @@ out_free:
static int sb_test(struct super_block *sb, void *data)
{
dev_t *dev = data;
+ struct ubifs_info *c = sb->s_fs_info;
- return sb->s_dev == *dev;
-}
-
-static int sb_set(struct super_block *sb, void *data)
-{
- dev_t *dev = data;
-
- sb->s_dev = *dev;
- return 0;
+ return c->vi.cdev == *dev;
}
static int ubifs_get_sb(struct file_system_type *fs_type, int flags,
@@ -2033,7 +2061,7 @@ static int ubifs_get_sb(struct file_system_type *fs_type, int flags,
dbg_gen("opened ubi%d_%d", vi.ubi_num, vi.vol_id);
- sb = sget(fs_type, &sb_test, &sb_set, &vi.cdev);
+ sb = sget(fs_type, &sb_test, &set_anon_super, &vi.cdev);
if (IS_ERR(sb)) {
err = PTR_ERR(sb);
goto out_close;
@@ -2073,16 +2101,11 @@ out_close:
return err;
}
-static void ubifs_kill_sb(struct super_block *sb)
-{
- generic_shutdown_super(sb);
-}
-
static struct file_system_type ubifs_fs_type = {
.name = "ubifs",
.owner = THIS_MODULE,
.get_sb = ubifs_get_sb,
- .kill_sb = ubifs_kill_sb
+ .kill_sb = kill_anon_super,
};
/*
diff --git a/fs/ubifs/ubifs.h b/fs/ubifs/ubifs.h
index 0a8341e1408..1bf01d82006 100644
--- a/fs/ubifs/ubifs.h
+++ b/fs/ubifs/ubifs.h
@@ -95,8 +95,8 @@
*/
#define BGT_NAME_PATTERN "ubifs_bgt%d_%d"
-/* Default write-buffer synchronization timeout (5 secs) */
-#define DEFAULT_WBUF_TIMEOUT (5 * HZ)
+/* Default write-buffer synchronization timeout in seconds */
+#define DEFAULT_WBUF_TIMEOUT_SECS 5
/* Maximum possible inode number (only 32-bit inodes are supported now) */
#define MAX_INUM 0xFFFFFFFF
@@ -650,8 +650,10 @@ typedef int (*ubifs_lpt_scan_callback)(struct ubifs_info *c,
* @io_mutex: serializes write-buffer I/O
* @lock: serializes @buf, @lnum, @offs, @avail, @used, @next_ino and @inodes
* fields
+ * @softlimit: soft write-buffer timeout interval
+ * @delta: hard and soft timeouts delta (the timer expire inteval is @softlimit
+ * and @softlimit + @delta)
* @timer: write-buffer timer
- * @timeout: timer expire interval in jiffies
* @need_sync: it is set if its timer expired and needs sync
* @next_ino: points to the next position of the following inode number
* @inodes: stores the inode numbers of the nodes which are in wbuf
@@ -678,8 +680,9 @@ struct ubifs_wbuf {
int (*sync_callback)(struct ubifs_info *c, int lnum, int free, int pad);
struct mutex io_mutex;
spinlock_t lock;
- struct timer_list timer;
- int timeout;
+ ktime_t softlimit;
+ unsigned long long delta;
+ struct hrtimer timer;
int need_sync;
int next_ino;
ino_t *inodes;