linux/fs/exofs/inode.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

1358 lines
33 KiB
C

/*
* Copyright (C) 2005, 2006
* Avishay Traeger (avishay@gmail.com)
* Copyright (C) 2008, 2009
* Boaz Harrosh <bharrosh@panasas.com>
*
* Copyrights for code taken from ext2:
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
* from
* linux/fs/minix/inode.c
* Copyright (C) 1991, 1992 Linus Torvalds
*
* This file is part of exofs.
*
* exofs is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation. Since it is based on ext2, and the only
* valid version of GPL for the Linux kernel is version 2, the only valid
* version of GPL for exofs is version 2.
*
* exofs is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with exofs; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/slab.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h>
#include <scsi/scsi_device.h>
#include "exofs.h"
#define EXOFS_DBGMSG2(M...) do {} while (0)
enum { BIO_MAX_PAGES_KMALLOC =
(PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec),
MAX_PAGES_KMALLOC =
PAGE_SIZE / sizeof(struct page *),
};
struct page_collect {
struct exofs_sb_info *sbi;
struct inode *inode;
unsigned expected_pages;
struct exofs_io_state *ios;
struct page **pages;
unsigned alloc_pages;
unsigned nr_pages;
unsigned long length;
loff_t pg_first; /* keep 64bit also in 32-arches */
};
static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
struct inode *inode)
{
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
pcol->sbi = sbi;
pcol->inode = inode;
pcol->expected_pages = expected_pages;
pcol->ios = NULL;
pcol->pages = NULL;
pcol->alloc_pages = 0;
pcol->nr_pages = 0;
pcol->length = 0;
pcol->pg_first = -1;
}
static void _pcol_reset(struct page_collect *pcol)
{
pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
pcol->pages = NULL;
pcol->alloc_pages = 0;
pcol->nr_pages = 0;
pcol->length = 0;
pcol->pg_first = -1;
pcol->ios = NULL;
/* this is probably the end of the loop but in writes
* it might not end here. don't be left with nothing
*/
if (!pcol->expected_pages)
pcol->expected_pages = MAX_PAGES_KMALLOC;
}
static int pcol_try_alloc(struct page_collect *pcol)
{
unsigned pages = min_t(unsigned, pcol->expected_pages,
MAX_PAGES_KMALLOC);
if (!pcol->ios) { /* First time allocate io_state */
int ret = exofs_get_io_state(&pcol->sbi->layout, &pcol->ios);
if (ret)
return ret;
}
/* TODO: easily support bio chaining */
pages = min_t(unsigned, pages,
pcol->sbi->layout.group_width * BIO_MAX_PAGES_KMALLOC);
for (; pages; pages >>= 1) {
pcol->pages = kmalloc(pages * sizeof(struct page *),
GFP_KERNEL);
if (likely(pcol->pages)) {
pcol->alloc_pages = pages;
return 0;
}
}
EXOFS_ERR("Failed to kmalloc expected_pages=%u\n",
pcol->expected_pages);
return -ENOMEM;
}
static void pcol_free(struct page_collect *pcol)
{
kfree(pcol->pages);
pcol->pages = NULL;
if (pcol->ios) {
exofs_put_io_state(pcol->ios);
pcol->ios = NULL;
}
}
static int pcol_add_page(struct page_collect *pcol, struct page *page,
unsigned len)
{
if (unlikely(pcol->nr_pages >= pcol->alloc_pages))
return -ENOMEM;
pcol->pages[pcol->nr_pages++] = page;
pcol->length += len;
return 0;
}
static int update_read_page(struct page *page, int ret)
{
if (ret == 0) {
/* Everything is OK */
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
} else if (ret == -EFAULT) {
/* In this case we were trying to read something that wasn't on
* disk yet - return a page full of zeroes. This should be OK,
* because the object should be empty (if there was a write
* before this read, the read would be waiting with the page
* locked */
clear_highpage(page);
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
ret = 0; /* recovered error */
EXOFS_DBGMSG("recovered read error\n");
} else /* Error */
SetPageError(page);
return ret;
}
static void update_write_page(struct page *page, int ret)
{
if (ret) {
mapping_set_error(page->mapping, ret);
SetPageError(page);
}
end_page_writeback(page);
}
/* Called at the end of reads, to optionally unlock pages and update their
* status.
*/
static int __readpages_done(struct page_collect *pcol, bool do_unlock)
{
int i;
u64 resid;
u64 good_bytes;
u64 length = 0;
int ret = exofs_check_io(pcol->ios, &resid);
if (likely(!ret))
good_bytes = pcol->length;
else
good_bytes = pcol->length - resid;
EXOFS_DBGMSG2("readpages_done(0x%lx) good_bytes=0x%llx"
" length=0x%lx nr_pages=%u\n",
pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
pcol->nr_pages);
for (i = 0; i < pcol->nr_pages; i++) {
struct page *page = pcol->pages[i];
struct inode *inode = page->mapping->host;
int page_stat;
if (inode != pcol->inode)
continue; /* osd might add more pages at end */
if (likely(length < good_bytes))
page_stat = 0;
else
page_stat = ret;
EXOFS_DBGMSG2(" readpages_done(0x%lx, 0x%lx) %s\n",
inode->i_ino, page->index,
page_stat ? "bad_bytes" : "good_bytes");
ret = update_read_page(page, page_stat);
if (do_unlock)
unlock_page(page);
length += PAGE_SIZE;
}
pcol_free(pcol);
EXOFS_DBGMSG2("readpages_done END\n");
return ret;
}
/* callback of async reads */
static void readpages_done(struct exofs_io_state *ios, void *p)
{
struct page_collect *pcol = p;
__readpages_done(pcol, true);
atomic_dec(&pcol->sbi->s_curr_pending);
kfree(pcol);
}
static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
{
int i;
for (i = 0; i < pcol->nr_pages; i++) {
struct page *page = pcol->pages[i];
if (rw == READ)
update_read_page(page, ret);
else
update_write_page(page, ret);
unlock_page(page);
}
}
static int read_exec(struct page_collect *pcol, bool is_sync)
{
struct exofs_i_info *oi = exofs_i(pcol->inode);
struct exofs_io_state *ios = pcol->ios;
struct page_collect *pcol_copy = NULL;
int ret;
if (!pcol->pages)
return 0;
/* see comment in _readpage() about sync reads */
WARN_ON(is_sync && (pcol->nr_pages != 1));
ios->pages = pcol->pages;
ios->nr_pages = pcol->nr_pages;
ios->length = pcol->length;
ios->offset = pcol->pg_first << PAGE_CACHE_SHIFT;
if (is_sync) {
exofs_oi_read(oi, pcol->ios);
return __readpages_done(pcol, false);
}
pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
if (!pcol_copy) {
ret = -ENOMEM;
goto err;
}
*pcol_copy = *pcol;
ios->done = readpages_done;
ios->private = pcol_copy;
ret = exofs_oi_read(oi, ios);
if (unlikely(ret))
goto err;
atomic_inc(&pcol->sbi->s_curr_pending);
EXOFS_DBGMSG2("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
ios->obj.id, _LLU(ios->offset), pcol->length);
/* pages ownership was passed to pcol_copy */
_pcol_reset(pcol);
return 0;
err:
if (!is_sync)
_unlock_pcol_pages(pcol, ret, READ);
pcol_free(pcol);
kfree(pcol_copy);
return ret;
}
/* readpage_strip is called either directly from readpage() or by the VFS from
* within read_cache_pages(), to add one more page to be read. It will try to
* collect as many contiguous pages as posible. If a discontinuity is
* encountered, or it runs out of resources, it will submit the previous segment
* and will start a new collection. Eventually caller must submit the last
* segment if present.
*/
static int readpage_strip(void *data, struct page *page)
{
struct page_collect *pcol = data;
struct inode *inode = pcol->inode;
struct exofs_i_info *oi = exofs_i(inode);
loff_t i_size = i_size_read(inode);
pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
size_t len;
int ret;
/* FIXME: Just for debugging, will be removed */
if (PageUptodate(page))
EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
page->index);
if (page->index < end_index)
len = PAGE_CACHE_SIZE;
else if (page->index == end_index)
len = i_size & ~PAGE_CACHE_MASK;
else
len = 0;
if (!len || !obj_created(oi)) {
/* this will be out of bounds, or doesn't exist yet.
* Current page is cleared and the request is split
*/
clear_highpage(page);
SetPageUptodate(page);
if (PageError(page))
ClearPageError(page);
unlock_page(page);
EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page,"
" splitting\n", inode->i_ino, page->index);
return read_exec(pcol, false);
}
try_again:
if (unlikely(pcol->pg_first == -1)) {
pcol->pg_first = page->index;
} else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
page->index)) {
/* Discontinuity detected, split the request */
ret = read_exec(pcol, false);
if (unlikely(ret))
goto fail;
goto try_again;
}
if (!pcol->pages) {
ret = pcol_try_alloc(pcol);
if (unlikely(ret))
goto fail;
}
if (len != PAGE_CACHE_SIZE)
zero_user(page, len, PAGE_CACHE_SIZE - len);
EXOFS_DBGMSG2(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
inode->i_ino, page->index, len);
ret = pcol_add_page(pcol, page, len);
if (ret) {
EXOFS_DBGMSG2("Failed pcol_add_page pages[i]=%p "
"this_len=0x%zx nr_pages=%u length=0x%lx\n",
page, len, pcol->nr_pages, pcol->length);
/* split the request, and start again with current page */
ret = read_exec(pcol, false);
if (unlikely(ret))
goto fail;
goto try_again;
}
return 0;
fail:
/* SetPageError(page); ??? */
unlock_page(page);
return ret;
}
static int exofs_readpages(struct file *file, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages)
{
struct page_collect pcol;
int ret;
_pcol_init(&pcol, nr_pages, mapping->host);
ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
if (ret) {
EXOFS_ERR("read_cache_pages => %d\n", ret);
return ret;
}
return read_exec(&pcol, false);
}
static int _readpage(struct page *page, bool is_sync)
{
struct page_collect pcol;
int ret;
_pcol_init(&pcol, 1, page->mapping->host);
/* readpage_strip might call read_exec(,is_sync==false) at several
* places but not if we have a single page.
*/
ret = readpage_strip(&pcol, page);
if (ret) {
EXOFS_ERR("_readpage => %d\n", ret);
return ret;
}
return read_exec(&pcol, is_sync);
}
/*
* We don't need the file
*/
static int exofs_readpage(struct file *file, struct page *page)
{
return _readpage(page, false);
}
/* Callback for osd_write. All writes are asynchronous */
static void writepages_done(struct exofs_io_state *ios, void *p)
{
struct page_collect *pcol = p;
int i;
u64 resid;
u64 good_bytes;
u64 length = 0;
int ret = exofs_check_io(ios, &resid);
atomic_dec(&pcol->sbi->s_curr_pending);
if (likely(!ret))
good_bytes = pcol->length;
else
good_bytes = pcol->length - resid;
EXOFS_DBGMSG2("writepages_done(0x%lx) good_bytes=0x%llx"
" length=0x%lx nr_pages=%u\n",
pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
pcol->nr_pages);
for (i = 0; i < pcol->nr_pages; i++) {
struct page *page = pcol->pages[i];
struct inode *inode = page->mapping->host;
int page_stat;
if (inode != pcol->inode)
continue; /* osd might add more pages to a bio */
if (likely(length < good_bytes))
page_stat = 0;
else
page_stat = ret;
update_write_page(page, page_stat);
unlock_page(page);
EXOFS_DBGMSG2(" writepages_done(0x%lx, 0x%lx) status=%d\n",
inode->i_ino, page->index, page_stat);
length += PAGE_SIZE;
}
pcol_free(pcol);
kfree(pcol);
EXOFS_DBGMSG2("writepages_done END\n");
}
static int write_exec(struct page_collect *pcol)
{
struct exofs_i_info *oi = exofs_i(pcol->inode);
struct exofs_io_state *ios = pcol->ios;
struct page_collect *pcol_copy = NULL;
int ret;
if (!pcol->pages)
return 0;
pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
if (!pcol_copy) {
EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n");
ret = -ENOMEM;
goto err;
}
*pcol_copy = *pcol;
ios->pages = pcol_copy->pages;
ios->nr_pages = pcol_copy->nr_pages;
ios->offset = pcol_copy->pg_first << PAGE_CACHE_SHIFT;
ios->length = pcol_copy->length;
ios->done = writepages_done;
ios->private = pcol_copy;
ret = exofs_oi_write(oi, ios);
if (unlikely(ret)) {
EXOFS_ERR("write_exec: exofs_oi_write() Faild\n");
goto err;
}
atomic_inc(&pcol->sbi->s_curr_pending);
EXOFS_DBGMSG2("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n",
pcol->inode->i_ino, pcol->pg_first, _LLU(ios->offset),
pcol->length);
/* pages ownership was passed to pcol_copy */
_pcol_reset(pcol);
return 0;
err:
_unlock_pcol_pages(pcol, ret, WRITE);
pcol_free(pcol);
kfree(pcol_copy);
return ret;
}
/* writepage_strip is called either directly from writepage() or by the VFS from
* within write_cache_pages(), to add one more page to be written to storage.
* It will try to collect as many contiguous pages as possible. If a
* discontinuity is encountered or it runs out of resources it will submit the
* previous segment and will start a new collection.
* Eventually caller must submit the last segment if present.
*/
static int writepage_strip(struct page *page,
struct writeback_control *wbc_unused, void *data)
{
struct page_collect *pcol = data;
struct inode *inode = pcol->inode;
struct exofs_i_info *oi = exofs_i(inode);
loff_t i_size = i_size_read(inode);
pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
size_t len;
int ret;
BUG_ON(!PageLocked(page));
ret = wait_obj_created(oi);
if (unlikely(ret))
goto fail;
if (page->index < end_index)
/* in this case, the page is within the limits of the file */
len = PAGE_CACHE_SIZE;
else {
len = i_size & ~PAGE_CACHE_MASK;
if (page->index > end_index || !len) {
/* in this case, the page is outside the limits
* (truncate in progress)
*/
ret = write_exec(pcol);
if (unlikely(ret))
goto fail;
if (PageError(page))
ClearPageError(page);
unlock_page(page);
EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) "
"outside the limits\n",
inode->i_ino, page->index);
return 0;
}
}
try_again:
if (unlikely(pcol->pg_first == -1)) {
pcol->pg_first = page->index;
} else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
page->index)) {
/* Discontinuity detected, split the request */
ret = write_exec(pcol);
if (unlikely(ret))
goto fail;
EXOFS_DBGMSG("writepage_strip(0x%lx, 0x%lx) Discontinuity\n",
inode->i_ino, page->index);
goto try_again;
}
if (!pcol->pages) {
ret = pcol_try_alloc(pcol);
if (unlikely(ret))
goto fail;
}
EXOFS_DBGMSG2(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
inode->i_ino, page->index, len);
ret = pcol_add_page(pcol, page, len);
if (unlikely(ret)) {
EXOFS_DBGMSG2("Failed pcol_add_page "
"nr_pages=%u total_length=0x%lx\n",
pcol->nr_pages, pcol->length);
/* split the request, next loop will start again */
ret = write_exec(pcol);
if (unlikely(ret)) {
EXOFS_DBGMSG("write_exec faild => %d", ret);
goto fail;
}
goto try_again;
}
BUG_ON(PageWriteback(page));
set_page_writeback(page);
return 0;
fail:
EXOFS_DBGMSG("Error: writepage_strip(0x%lx, 0x%lx)=>%d\n",
inode->i_ino, page->index, ret);
set_bit(AS_EIO, &page->mapping->flags);
unlock_page(page);
return ret;
}
static int exofs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct page_collect pcol;
long start, end, expected_pages;
int ret;
start = wbc->range_start >> PAGE_CACHE_SHIFT;
end = (wbc->range_end == LLONG_MAX) ?
start + mapping->nrpages :
wbc->range_end >> PAGE_CACHE_SHIFT;
if (start || end)
expected_pages = end - start + 1;
else
expected_pages = mapping->nrpages;
if (expected_pages < 32L)
expected_pages = 32L;
EXOFS_DBGMSG2("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx "
"nrpages=%lu start=0x%lx end=0x%lx expected_pages=%ld\n",
mapping->host->i_ino, wbc->range_start, wbc->range_end,
mapping->nrpages, start, end, expected_pages);
_pcol_init(&pcol, expected_pages, mapping->host);
ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
if (ret) {
EXOFS_ERR("write_cache_pages => %d\n", ret);
return ret;
}
return write_exec(&pcol);
}
static int exofs_writepage(struct page *page, struct writeback_control *wbc)
{
struct page_collect pcol;
int ret;
_pcol_init(&pcol, 1, page->mapping->host);
ret = writepage_strip(page, NULL, &pcol);
if (ret) {
EXOFS_ERR("exofs_writepage => %d\n", ret);
return ret;
}
return write_exec(&pcol);
}
int exofs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
int ret = 0;
struct page *page;
page = *pagep;
if (page == NULL) {
ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
fsdata);
if (ret) {
EXOFS_DBGMSG("simple_write_begin faild\n");
return ret;
}
page = *pagep;
}
/* read modify write */
if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
ret = _readpage(page, true);
if (ret) {
/*SetPageError was done by _readpage. Is it ok?*/
unlock_page(page);
EXOFS_DBGMSG("__readpage_filler faild\n");
}
}
return ret;
}
static int exofs_write_begin_export(struct file *file,
struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
*pagep = NULL;
return exofs_write_begin(file, mapping, pos, len, flags, pagep,
fsdata);
}
static int exofs_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
/* According to comment in simple_write_end i_mutex is held */
loff_t i_size = inode->i_size;
int ret;
ret = simple_write_end(file, mapping,pos, len, copied, page, fsdata);
if (i_size != inode->i_size)
mark_inode_dirty(inode);
return ret;
}
const struct address_space_operations exofs_aops = {
.readpage = exofs_readpage,
.readpages = exofs_readpages,
.writepage = exofs_writepage,
.writepages = exofs_writepages,
.write_begin = exofs_write_begin_export,
.write_end = exofs_write_end,
};
/******************************************************************************
* INODE OPERATIONS
*****************************************************************************/
/*
* Test whether an inode is a fast symlink.
*/
static inline int exofs_inode_is_fast_symlink(struct inode *inode)
{
struct exofs_i_info *oi = exofs_i(inode);
return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
}
/*
* get_block_t - Fill in a buffer_head
* An OSD takes care of block allocation so we just fake an allocation by
* putting in the inode's sector_t in the buffer_head.
* TODO: What about the case of create==0 and @iblock does not exist in the
* object?
*/
static int exofs_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
map_bh(bh_result, inode->i_sb, iblock);
return 0;
}
const struct osd_attr g_attr_logical_length = ATTR_DEF(
OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
static int _do_truncate(struct inode *inode)
{
struct exofs_i_info *oi = exofs_i(inode);
loff_t isize = i_size_read(inode);
int ret;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
nobh_truncate_page(inode->i_mapping, isize, exofs_get_block);
ret = exofs_oi_truncate(oi, (u64)isize);
EXOFS_DBGMSG("(0x%lx) size=0x%llx\n", inode->i_ino, isize);
return ret;
}
/*
* Truncate a file to the specified size - all we have to do is set the size
* attribute. We make sure the object exists first.
*/
void exofs_truncate(struct inode *inode)
{
struct exofs_i_info *oi = exofs_i(inode);
int ret;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
|| S_ISLNK(inode->i_mode)))
return;
if (exofs_inode_is_fast_symlink(inode))
return;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return;
/* if we are about to truncate an object, and it hasn't been
* created yet, wait
*/
if (unlikely(wait_obj_created(oi)))
goto fail;
ret = _do_truncate(inode);
if (ret)
goto fail;
out:
mark_inode_dirty(inode);
return;
fail:
make_bad_inode(inode);
goto out;
}
/*
* Set inode attributes - just call generic functions.
*/
int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
{
struct inode *inode = dentry->d_inode;
int error;
error = inode_change_ok(inode, iattr);
if (error)
return error;
error = inode_setattr(inode, iattr);
return error;
}
static const struct osd_attr g_attr_inode_file_layout = ATTR_DEF(
EXOFS_APAGE_FS_DATA,
EXOFS_ATTR_INODE_FILE_LAYOUT,
0);
static const struct osd_attr g_attr_inode_dir_layout = ATTR_DEF(
EXOFS_APAGE_FS_DATA,
EXOFS_ATTR_INODE_DIR_LAYOUT,
0);
/*
* Read the Linux inode info from the OSD, and return it as is. In exofs the
* inode info is in an application specific page/attribute of the osd-object.
*/
static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
struct exofs_fcb *inode)
{
struct exofs_sb_info *sbi = sb->s_fs_info;
struct osd_attr attrs[] = {
[0] = g_attr_inode_data,
[1] = g_attr_inode_file_layout,
[2] = g_attr_inode_dir_layout,
};
struct exofs_io_state *ios;
struct exofs_on_disk_inode_layout *layout;
int ret;
ret = exofs_get_io_state(&sbi->layout, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
return ret;
}
ios->obj.id = exofs_oi_objno(oi);
exofs_make_credential(oi->i_cred, &ios->obj);
ios->cred = oi->i_cred;
attrs[1].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs);
attrs[2].len = exofs_on_disk_inode_layout_size(sbi->layout.s_numdevs);
ios->in_attr = attrs;
ios->in_attr_len = ARRAY_SIZE(attrs);
ret = exofs_sbi_read(ios);
if (unlikely(ret)) {
EXOFS_ERR("object(0x%llx) corrupted, return empty file=>%d\n",
_LLU(ios->obj.id), ret);
memset(inode, 0, sizeof(*inode));
inode->i_mode = 0040000 | (0777 & ~022);
/* If object is lost on target we might as well enable it's
* delete.
*/
if ((ret == -ENOENT) || (ret == -EINVAL))
ret = 0;
goto out;
}
ret = extract_attr_from_ios(ios, &attrs[0]);
if (ret) {
EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
goto out;
}
WARN_ON(attrs[0].len != EXOFS_INO_ATTR_SIZE);
memcpy(inode, attrs[0].val_ptr, EXOFS_INO_ATTR_SIZE);
ret = extract_attr_from_ios(ios, &attrs[1]);
if (ret) {
EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
goto out;
}
if (attrs[1].len) {
layout = attrs[1].val_ptr;
if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
EXOFS_ERR("%s: unsupported files layout %d\n",
__func__, layout->gen_func);
ret = -ENOTSUPP;
goto out;
}
}
ret = extract_attr_from_ios(ios, &attrs[2]);
if (ret) {
EXOFS_ERR("%s: extract_attr of inode_data failed\n", __func__);
goto out;
}
if (attrs[2].len) {
layout = attrs[2].val_ptr;
if (layout->gen_func != cpu_to_le16(LAYOUT_MOVING_WINDOW)) {
EXOFS_ERR("%s: unsupported meta-data layout %d\n",
__func__, layout->gen_func);
ret = -ENOTSUPP;
goto out;
}
}
out:
exofs_put_io_state(ios);
return ret;
}
static void __oi_init(struct exofs_i_info *oi)
{
init_waitqueue_head(&oi->i_wq);
oi->i_flags = 0;
}
/*
* Fill in an inode read from the OSD and set it up for use
*/
struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
{
struct exofs_i_info *oi;
struct exofs_fcb fcb;
struct inode *inode;
int ret;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
oi = exofs_i(inode);
__oi_init(oi);
/* read the inode from the osd */
ret = exofs_get_inode(sb, oi, &fcb);
if (ret)
goto bad_inode;
set_obj_created(oi);
/* copy stuff from on-disk struct to in-memory struct */
inode->i_mode = le16_to_cpu(fcb.i_mode);
inode->i_uid = le32_to_cpu(fcb.i_uid);
inode->i_gid = le32_to_cpu(fcb.i_gid);
inode->i_nlink = le16_to_cpu(fcb.i_links_count);
inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
inode->i_ctime.tv_nsec =
inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
oi->i_commit_size = le64_to_cpu(fcb.i_size);
i_size_write(inode, oi->i_commit_size);
inode->i_blkbits = EXOFS_BLKSHIFT;
inode->i_generation = le32_to_cpu(fcb.i_generation);
oi->i_dir_start_lookup = 0;
if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
ret = -ESTALE;
goto bad_inode;
}
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
if (fcb.i_data[0])
inode->i_rdev =
old_decode_dev(le32_to_cpu(fcb.i_data[0]));
else
inode->i_rdev =
new_decode_dev(le32_to_cpu(fcb.i_data[1]));
} else {
memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
}
if (S_ISREG(inode->i_mode)) {
inode->i_op = &exofs_file_inode_operations;
inode->i_fop = &exofs_file_operations;
inode->i_mapping->a_ops = &exofs_aops;
} else if (S_ISDIR(inode->i_mode)) {
inode->i_op = &exofs_dir_inode_operations;
inode->i_fop = &exofs_dir_operations;
inode->i_mapping->a_ops = &exofs_aops;
} else if (S_ISLNK(inode->i_mode)) {
if (exofs_inode_is_fast_symlink(inode))
inode->i_op = &exofs_fast_symlink_inode_operations;
else {
inode->i_op = &exofs_symlink_inode_operations;
inode->i_mapping->a_ops = &exofs_aops;
}
} else {
inode->i_op = &exofs_special_inode_operations;
if (fcb.i_data[0])
init_special_inode(inode, inode->i_mode,
old_decode_dev(le32_to_cpu(fcb.i_data[0])));
else
init_special_inode(inode, inode->i_mode,
new_decode_dev(le32_to_cpu(fcb.i_data[1])));
}
unlock_new_inode(inode);
return inode;
bad_inode:
iget_failed(inode);
return ERR_PTR(ret);
}
int __exofs_wait_obj_created(struct exofs_i_info *oi)
{
if (!obj_created(oi)) {
BUG_ON(!obj_2bcreated(oi));
wait_event(oi->i_wq, obj_created(oi));
}
return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
}
/*
* Callback function from exofs_new_inode(). The important thing is that we
* set the obj_created flag so that other methods know that the object exists on
* the OSD.
*/
static void create_done(struct exofs_io_state *ios, void *p)
{
struct inode *inode = p;
struct exofs_i_info *oi = exofs_i(inode);
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
int ret;
ret = exofs_check_io(ios, NULL);
exofs_put_io_state(ios);
atomic_dec(&sbi->s_curr_pending);
if (unlikely(ret)) {
EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx",
_LLU(exofs_oi_objno(oi)), _LLU(sbi->layout.s_pid));
/*TODO: When FS is corrupted creation can fail, object already
* exist. Get rid of this asynchronous creation, if exist
* increment the obj counter and try the next object. Until we
* succeed. All these dangling objects will be made into lost
* files by chkfs.exofs
*/
}
set_obj_created(oi);
atomic_dec(&inode->i_count);
wake_up(&oi->i_wq);
}
/*
* Set up a new inode and create an object for it on the OSD
*/
struct inode *exofs_new_inode(struct inode *dir, int mode)
{
struct super_block *sb;
struct inode *inode;
struct exofs_i_info *oi;
struct exofs_sb_info *sbi;
struct exofs_io_state *ios;
int ret;
sb = dir->i_sb;
inode = new_inode(sb);
if (!inode)
return ERR_PTR(-ENOMEM);
oi = exofs_i(inode);
__oi_init(oi);
set_obj_2bcreated(oi);
sbi = sb->s_fs_info;
sb->s_dirt = 1;
inode->i_uid = current->cred->fsuid;
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else {
inode->i_gid = current->cred->fsgid;
}
inode->i_mode = mode;
inode->i_ino = sbi->s_nextid++;
inode->i_blkbits = EXOFS_BLKSHIFT;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
oi->i_commit_size = inode->i_size = 0;
spin_lock(&sbi->s_next_gen_lock);
inode->i_generation = sbi->s_next_generation++;
spin_unlock(&sbi->s_next_gen_lock);
insert_inode_hash(inode);
mark_inode_dirty(inode);
ret = exofs_get_io_state(&sbi->layout, &ios);
if (unlikely(ret)) {
EXOFS_ERR("exofs_new_inode: exofs_get_io_state failed\n");
return ERR_PTR(ret);
}
ios->obj.id = exofs_oi_objno(oi);
exofs_make_credential(oi->i_cred, &ios->obj);
/* increment the refcount so that the inode will still be around when we
* reach the callback
*/
atomic_inc(&inode->i_count);
ios->done = create_done;
ios->private = inode;
ios->cred = oi->i_cred;
ret = exofs_sbi_create(ios);
if (ret) {
atomic_dec(&inode->i_count);
exofs_put_io_state(ios);
return ERR_PTR(ret);
}
atomic_inc(&sbi->s_curr_pending);
return inode;
}
/*
* struct to pass two arguments to update_inode's callback
*/
struct updatei_args {
struct exofs_sb_info *sbi;
struct exofs_fcb fcb;
};
/*
* Callback function from exofs_update_inode().
*/
static void updatei_done(struct exofs_io_state *ios, void *p)
{
struct updatei_args *args = p;
exofs_put_io_state(ios);
atomic_dec(&args->sbi->s_curr_pending);
kfree(args);
}
/*
* Write the inode to the OSD. Just fill up the struct, and set the attribute
* synchronously or asynchronously depending on the do_sync flag.
*/
static int exofs_update_inode(struct inode *inode, int do_sync)
{
struct exofs_i_info *oi = exofs_i(inode);
struct super_block *sb = inode->i_sb;
struct exofs_sb_info *sbi = sb->s_fs_info;
struct exofs_io_state *ios;
struct osd_attr attr;
struct exofs_fcb *fcb;
struct updatei_args *args;
int ret;
args = kzalloc(sizeof(*args), GFP_KERNEL);
if (!args) {
EXOFS_DBGMSG("Faild kzalloc of args\n");
return -ENOMEM;
}
fcb = &args->fcb;
fcb->i_mode = cpu_to_le16(inode->i_mode);
fcb->i_uid = cpu_to_le32(inode->i_uid);
fcb->i_gid = cpu_to_le32(inode->i_gid);
fcb->i_links_count = cpu_to_le16(inode->i_nlink);
fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
oi->i_commit_size = i_size_read(inode);
fcb->i_size = cpu_to_le64(oi->i_commit_size);
fcb->i_generation = cpu_to_le32(inode->i_generation);
if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
if (old_valid_dev(inode->i_rdev)) {
fcb->i_data[0] =
cpu_to_le32(old_encode_dev(inode->i_rdev));
fcb->i_data[1] = 0;
} else {
fcb->i_data[0] = 0;
fcb->i_data[1] =
cpu_to_le32(new_encode_dev(inode->i_rdev));
fcb->i_data[2] = 0;
}
} else
memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
ret = exofs_get_io_state(&sbi->layout, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__);
goto free_args;
}
attr = g_attr_inode_data;
attr.val_ptr = fcb;
ios->out_attr_len = 1;
ios->out_attr = &attr;
if (!obj_created(oi)) {
EXOFS_DBGMSG("!obj_created\n");
BUG_ON(!obj_2bcreated(oi));
wait_event(oi->i_wq, obj_created(oi));
EXOFS_DBGMSG("wait_event done\n");
}
if (!do_sync) {
args->sbi = sbi;
ios->done = updatei_done;
ios->private = args;
}
ret = exofs_oi_write(oi, ios);
if (!do_sync && !ret) {
atomic_inc(&sbi->s_curr_pending);
goto out; /* deallocation in updatei_done */
}
exofs_put_io_state(ios);
free_args:
kfree(args);
out:
EXOFS_DBGMSG("(0x%lx) do_sync=%d ret=>%d\n",
inode->i_ino, do_sync, ret);
return ret;
}
int exofs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
return exofs_update_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
}
/*
* Callback function from exofs_delete_inode() - don't have much cleaning up to
* do.
*/
static void delete_done(struct exofs_io_state *ios, void *p)
{
struct exofs_sb_info *sbi = p;
exofs_put_io_state(ios);
atomic_dec(&sbi->s_curr_pending);
}
/*
* Called when the refcount of an inode reaches zero. We remove the object
* from the OSD here. We make sure the object was created before we try and
* delete it.
*/
void exofs_delete_inode(struct inode *inode)
{
struct exofs_i_info *oi = exofs_i(inode);
struct super_block *sb = inode->i_sb;
struct exofs_sb_info *sbi = sb->s_fs_info;
struct exofs_io_state *ios;
int ret;
truncate_inode_pages(&inode->i_data, 0);
if (is_bad_inode(inode))
goto no_delete;
mark_inode_dirty(inode);
exofs_update_inode(inode, inode_needs_sync(inode));
inode->i_size = 0;
if (inode->i_blocks)
exofs_truncate(inode);
clear_inode(inode);
ret = exofs_get_io_state(&sbi->layout, &ios);
if (unlikely(ret)) {
EXOFS_ERR("%s: exofs_get_io_state failed\n", __func__);
return;
}
/* if we are deleting an obj that hasn't been created yet, wait */
if (!obj_created(oi)) {
BUG_ON(!obj_2bcreated(oi));
wait_event(oi->i_wq, obj_created(oi));
}
ios->obj.id = exofs_oi_objno(oi);
ios->done = delete_done;
ios->private = sbi;
ios->cred = oi->i_cred;
ret = exofs_sbi_remove(ios);
if (ret) {
EXOFS_ERR("%s: exofs_sbi_remove failed\n", __func__);
exofs_put_io_state(ios);
return;
}
atomic_inc(&sbi->s_curr_pending);
return;
no_delete:
clear_inode(inode);
}