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mm: convert i_mmap_mutex to rwsem

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The i_mmap_mutex is a close cousin of the anon vma lock, both protecting
similar data, one for file backed pages and the other for anon memory.  To
this end, this lock can also be a rwsem.  In addition, there are some
important opportunities to share the lock when there are no tree
modifications.

This conversion is straightforward.  For now, all users take the write
lock.

[sfr@canb.auug.org.au: update fremap.c]
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: "Kirill A. Shutemov" <kirill@shutemov.name>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso 2014-12-12 16:54:24 -08:00 • committed by Linus Torvalds
parent 83cde9e8ba
commit c8c06efa8b
10 changed files with 30 additions and 29 deletions
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10
fs/hugetlbfs/inode.c
View file

@ -472,12 +472,12 @@ static struct inode *hugetlbfs_get_root(struct super_block *sb,
}
/*
* Hugetlbfs is not reclaimable; therefore its i_mmap_mutex will never
* Hugetlbfs is not reclaimable; therefore its i_mmap_rwsem will never
* be taken from reclaim -- unlike regular filesystems. This needs an
* annotation because huge_pmd_share() does an allocation under
* i_mmap_mutex.
* i_mmap_rwsem.
*/
static struct lock_class_key hugetlbfs_i_mmap_mutex_key;
static struct lock_class_key hugetlbfs_i_mmap_rwsem_key;
static struct inode *hugetlbfs_get_inode(struct super_block *sb,
struct inode *dir,
@ -495,8 +495,8 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
struct hugetlbfs_inode_info *info;
inode->i_ino = get_next_ino();
inode_init_owner(inode, dir, mode);
lockdep_set_class(&inode->i_mapping->i_mmap_mutex,
&hugetlbfs_i_mmap_mutex_key);
lockdep_set_class(&inode->i_mapping->i_mmap_rwsem,
&hugetlbfs_i_mmap_rwsem_key);
inode->i_mapping->a_ops = &hugetlbfs_aops;
inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;