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Fixes in gfs2:

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* The current iomap_file_buffered_write behavior of failing the entire
   write when part of the user buffer cannot be faulted in leads to an
   endless loop in gfs2.  Work around that in gfs2 for now.
 * Various other bugs all over the place.
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Merge tag 'gfs2-v5.16-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fixes from Andreas Gruenbacher:

 - The current iomap_file_buffered_write behavior of failing the entire
   write when part of the user buffer cannot be faulted in leads to an
   endless loop in gfs2. Work around that in gfs2 for now.

 - Various other bugs all over the place.

* tag 'gfs2-v5.16-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Prevent endless loops in gfs2_file_buffered_write
  gfs2: Fix "Introduce flag for glock holder auto-demotion"
  gfs2: Fix length of holes reported at end-of-file
  gfs2: release iopen glock early in evict
  gfs2: Fix atomic bug in gfs2_instantiate
  gfs2: Only dereference i->iov when iter_is_iovec(i)
This commit is contained in:
Linus Torvalds 2021-11-17 15:55:07 -08:00
commit 42eb8fdac2
4 changed files with 18 additions and 19 deletions
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2
fs/gfs2/bmap.c
View File

@ -940,7 +940,7 @@ do_alloc:
else if (height == ip->i_height)
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
else
iomap->length = size - pos;
iomap->length = size - iomap->offset;
} else if (flags & IOMAP_WRITE) {
u64 alloc_size;

9
fs/gfs2/file.c
View File

@ -773,8 +773,8 @@ static inline bool should_fault_in_pages(ssize_t ret, struct iov_iter *i,
size_t *prev_count,
size_t *window_size)
{
char __user *p = i->iov[0].iov_base + i->iov_offset;
size_t count = iov_iter_count(i);
char __user *p;
int pages = 1;
if (likely(!count))
@ -787,14 +787,14 @@ static inline bool should_fault_in_pages(ssize_t ret, struct iov_iter *i,
if (*prev_count != count || !*window_size) {
int pages, nr_dirtied;
pages = min_t(int, BIO_MAX_VECS,
DIV_ROUND_UP(iov_iter_count(i), PAGE_SIZE));
pages = min_t(int, BIO_MAX_VECS, DIV_ROUND_UP(count, PAGE_SIZE));
nr_dirtied = max(current->nr_dirtied_pause -
current->nr_dirtied, 1);
pages = min(pages, nr_dirtied);
}
*prev_count = count;
p = i->iov[0].iov_base + i->iov_offset;
*window_size = (size_t)PAGE_SIZE * pages - offset_in_page(p);
return true;
}
@ -1013,6 +1013,7 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct gfs2_holder *statfs_gh = NULL;
size_t prev_count = 0, window_size = 0;
size_t orig_count = iov_iter_count(from);
size_t read = 0;
ssize_t ret;
@ -1057,6 +1058,7 @@ retry_under_glock:
if (inode == sdp->sd_rindex)
gfs2_glock_dq_uninit(statfs_gh);
from->count = orig_count - read;
if (should_fault_in_pages(ret, from, &prev_count, &window_size)) {
size_t leftover;
@ -1064,6 +1066,7 @@ retry_under_glock:
leftover = fault_in_iov_iter_readable(from, window_size);
gfs2_holder_disallow_demote(gh);
if (leftover != window_size) {
from->count = min(from->count, window_size - leftover);
if (!gfs2_holder_queued(gh)) {
if (read)
goto out_uninit;

12
fs/gfs2/glock.c
View File

@ -411,14 +411,14 @@ static void do_error(struct gfs2_glock *gl, const int ret)
static void demote_incompat_holders(struct gfs2_glock *gl,
struct gfs2_holder *new_gh)
{
struct gfs2_holder *gh;
struct gfs2_holder *gh, *tmp;
/*
* Demote incompatible holders before we make ourselves eligible.
* (This holder may or may not allow auto-demoting, but we don't want
* to demote the new holder before it's even granted.)
*/
list_for_each_entry(gh, &gl->gl_holders, gh_list) {
list_for_each_entry_safe(gh, tmp, &gl->gl_holders, gh_list) {
/*
* Since holders are at the front of the list, we stop when we
* find the first non-holder.
@ -496,7 +496,7 @@ again:
* Since we unlock the lockref lock, we set a flag to indicate
* instantiate is in progress.
*/
if (test_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags)) {
if (test_and_set_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags)) {
wait_on_bit(&gl->gl_flags, GLF_INSTANTIATE_IN_PROG,
TASK_UNINTERRUPTIBLE);
/*
@ -509,14 +509,10 @@ again:
goto again;
}
set_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags);
ret = glops->go_instantiate(gh);
if (!ret)
clear_bit(GLF_INSTANTIATE_NEEDED, &gl->gl_flags);
clear_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags);
smp_mb__after_atomic();
wake_up_bit(&gl->gl_flags, GLF_INSTANTIATE_IN_PROG);
clear_and_wake_up_bit(GLF_INSTANTIATE_IN_PROG, &gl->gl_flags);
return ret;
}

14
fs/gfs2/super.c
View File

@ -1402,13 +1402,6 @@ out:
gfs2_ordered_del_inode(ip);
clear_inode(inode);
gfs2_dir_hash_inval(ip);
if (ip->i_gl) {
glock_clear_object(ip->i_gl, ip);
wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
gfs2_glock_add_to_lru(ip->i_gl);
gfs2_glock_put_eventually(ip->i_gl);
ip->i_gl = NULL;
}
if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
@ -1421,6 +1414,13 @@ out:
gfs2_holder_uninit(&ip->i_iopen_gh);
gfs2_glock_put_eventually(gl);
}
if (ip->i_gl) {
glock_clear_object(ip->i_gl, ip);
wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
gfs2_glock_add_to_lru(ip->i_gl);
gfs2_glock_put_eventually(ip->i_gl);
ip->i_gl = NULL;
}
}
static struct inode *gfs2_alloc_inode(struct super_block *sb)