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author | Hugh Dickins <hughd@google.com> | 2011-08-03 23:21:24 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-08-04 00:25:23 (GMT) |
commit | 54af60421822bb9cb664dd5cd7aac46c01ccfcf8 (patch) | |
tree | b62d2b9ccc2b467ee5406bb0d3494db6a5f96582 /include | |
parent | 46f65ec15c6878a2b4a49f6e01b20b201b46a9e4 (diff) | |
download | linux-fsl-qoriq-54af60421822bb9cb664dd5cd7aac46c01ccfcf8.tar.xz |
tmpfs: convert shmem_getpage_gfp to radix-swap
Convert shmem_getpage_gfp(), the engine-room of shmem, to expect page or
swap entry returned from radix tree by find_lock_page().
Whereas the repetitive old method proceeded mainly under info->lock,
dropping and repeating whenever one of the conditions needed was not
met, now we can proceed without it, leaving shmem_add_to_page_cache() to
check for a race.
This way there is no need to preallocate a page, no need for an early
radix_tree_preload(), no need for mem_cgroup_shmem_charge_fallback().
Move the error unwinding down to the bottom instead of repeating it
throughout. ENOSPC handling is a little different from before: there is
no longer any race between find_lock_page() and finding swap, but we can
arrive at ENOSPC before calling shmem_recalc_inode(), which might
occasionally discover freed space.
Be stricter to check i_size before returning. info->lock is used for
little but alloced, swapped, i_blocks updates. Move i_blocks updates
out from under the max_blocks check, so even an unlimited size=0 mount
can show accurate du.
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions