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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:35 -0800
commit5ce1a70e2f00f0bce0cab57f798ca354b9496169 (patch)
tree6e80200536b7a3576fd71ff2c7135ffe87dc858e /mm/shmem.c
parent9d3cae26acb471d5954cfdc25d1438b32060babe (diff)
parentef53d16cded7f89b3843b7a96970dab897843ea5 (diff)
Merge branch 'akpm' (more incoming from Andrew)
Merge second patch-bomb from Andrew Morton: - A little DM fix - the MM queue * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (154 commits) ksm: allocate roots when needed mm: cleanup "swapcache" in do_swap_page mm,ksm: swapoff might need to copy mm,ksm: FOLL_MIGRATION do migration_entry_wait ksm: shrink 32-bit rmap_item back to 32 bytes ksm: treat unstable nid like in stable tree ksm: add some comments tmpfs: fix mempolicy object leaks tmpfs: fix use-after-free of mempolicy object mm/fadvise.c: drain all pagevecs if POSIX_FADV_DONTNEED fails to discard all pages mm: export mmu notifier invalidates mm: accelerate mm_populate() treatment of THP pages mm: use long type for page counts in mm_populate() and get_user_pages() mm: accurately document nr_free_*_pages functions with code comments HWPOISON: change order of error_states[]'s elements HWPOISON: fix misjudgement of page_action() for errors on mlocked pages memcg: stop warning on memcg_propagate_kmem net: change type of virtio_chan->p9_max_pages vmscan: change type of vm_total_pages to unsigned long fs/nfsd: change type of max_delegations, nfsd_drc_max_mem and nfsd_drc_mem_used ...
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c48
1 files changed, 30 insertions, 18 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 5dd56f6efdb..1ad79243cb7 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -335,19 +335,19 @@ static unsigned shmem_find_get_pages_and_swap(struct address_space *mapping,
pgoff_t start, unsigned int nr_pages,
struct page **pages, pgoff_t *indices)
{
- unsigned int i;
- unsigned int ret;
- unsigned int nr_found;
+ void **slot;
+ unsigned int ret = 0;
+ struct radix_tree_iter iter;
+
+ if (!nr_pages)
+ return 0;
rcu_read_lock();
restart:
- nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree,
- (void ***)pages, indices, start, nr_pages);
- ret = 0;
- for (i = 0; i < nr_found; i++) {
+ radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, start) {
struct page *page;
repeat:
- page = radix_tree_deref_slot((void **)pages[i]);
+ page = radix_tree_deref_slot(slot);
if (unlikely(!page))
continue;
if (radix_tree_exception(page)) {
@@ -364,17 +364,16 @@ repeat:
goto repeat;
/* Has the page moved? */
- if (unlikely(page != *((void **)pages[i]))) {
+ if (unlikely(page != *slot)) {
page_cache_release(page);
goto repeat;
}
export:
- indices[ret] = indices[i];
+ indices[ret] = iter.index;
pages[ret] = page;
- ret++;
+ if (++ret == nr_pages)
+ break;
}
- if (unlikely(!ret && nr_found))
- goto restart;
rcu_read_unlock();
return ret;
}
@@ -2386,6 +2385,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
bool remount)
{
char *this_char, *value, *rest;
+ struct mempolicy *mpol = NULL;
uid_t uid;
gid_t gid;
@@ -2414,7 +2414,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
printk(KERN_ERR
"tmpfs: No value for mount option '%s'\n",
this_char);
- return 1;
+ goto error;
}
if (!strcmp(this_char,"size")) {
@@ -2463,19 +2463,24 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo,
if (!gid_valid(sbinfo->gid))
goto bad_val;
} else if (!strcmp(this_char,"mpol")) {
- if (mpol_parse_str(value, &sbinfo->mpol))
+ mpol_put(mpol);
+ mpol = NULL;
+ if (mpol_parse_str(value, &mpol))
goto bad_val;
} else {
printk(KERN_ERR "tmpfs: Bad mount option %s\n",
this_char);
- return 1;
+ goto error;
}
}
+ sbinfo->mpol = mpol;
return 0;
bad_val:
printk(KERN_ERR "tmpfs: Bad value '%s' for mount option '%s'\n",
value, this_char);
+error:
+ mpol_put(mpol);
return 1;
}
@@ -2487,6 +2492,7 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
unsigned long inodes;
int error = -EINVAL;
+ config.mpol = NULL;
if (shmem_parse_options(data, &config, true))
return error;
@@ -2511,8 +2517,13 @@ static int shmem_remount_fs(struct super_block *sb, int *flags, char *data)
sbinfo->max_inodes = config.max_inodes;
sbinfo->free_inodes = config.max_inodes - inodes;
- mpol_put(sbinfo->mpol);
- sbinfo->mpol = config.mpol; /* transfers initial ref */
+ /*
+ * Preserve previous mempolicy unless mpol remount option was specified.
+ */
+ if (config.mpol) {
+ mpol_put(sbinfo->mpol);
+ sbinfo->mpol = config.mpol; /* transfers initial ref */
+ }
out:
spin_unlock(&sbinfo->stat_lock);
return error;
@@ -2545,6 +2556,7 @@ static void shmem_put_super(struct super_block *sb)
struct shmem_sb_info *sbinfo = SHMEM_SB(sb);
percpu_counter_destroy(&sbinfo->used_blocks);
+ mpol_put(sbinfo->mpol);
kfree(sbinfo);
sb->s_fs_info = NULL;
}