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authorLinus Torvalds <torvalds@linux-foundation.org>2014-06-12 10:30:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-12 10:30:18 -0700
commit16b9057804c02e2d351e9c8f606e909b43cbd9e7 (patch)
treea3ac6e1d9d57a8abf4267e5ead3f2de1309335eb /fs/ceph
parent5c02c392cd2320e8d612376d6b72b6548a680923 (diff)
parentc2338f2dc7c1e9f6202f370c64ffd7f44f3d4b51 (diff)
downloadlinux-16b9057804c02e2d351e9c8f606e909b43cbd9e7.tar.bz2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs updates from Al Viro: "This the bunch that sat in -next + lock_parent() fix. This is the minimal set; there's more pending stuff. In particular, I really hope to get acct.c fixes merged this cycle - we need that to deal sanely with delayed-mntput stuff. In the next pile, hopefully - that series is fairly short and localized (kernel/acct.c, fs/super.c and fs/namespace.c). In this pile: more iov_iter work. Most of prereqs for ->splice_write with sane locking order are there and Kent's dio rewrite would also fit nicely on top of this pile" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (70 commits) lock_parent: don't step on stale ->d_parent of all-but-freed one kill generic_file_splice_write() ceph: switch to iter_file_splice_write() shmem: switch to iter_file_splice_write() nfs: switch to iter_splice_write_file() fs/splice.c: remove unneeded exports ocfs2: switch to iter_file_splice_write() ->splice_write() via ->write_iter() bio_vec-backed iov_iter optimize copy_page_{to,from}_iter() bury generic_file_aio_{read,write} lustre: get rid of messing with iovecs ceph: switch to ->write_iter() ceph_sync_direct_write: stop poking into iov_iter guts ceph_sync_read: stop poking into iov_iter guts new helper: copy_page_from_iter() fuse: switch to ->write_iter() btrfs: switch to ->write_iter() ocfs2: switch to ->write_iter() xfs: switch to ->write_iter() ...
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/addr.c4
-rw-r--r--fs/ceph/file.c185
2 files changed, 74 insertions, 115 deletions
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 65a30e817dd8..4f3f69079f36 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1187,8 +1187,8 @@ static int ceph_write_end(struct file *file, struct address_space *mapping,
* never get called.
*/
static ssize_t ceph_direct_io(int rw, struct kiocb *iocb,
- const struct iovec *iov,
- loff_t pos, unsigned long nr_segs)
+ struct iov_iter *iter,
+ loff_t pos)
{
WARN_ON(1);
return -EINVAL;
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 88a6df4cbe6d..302085100c28 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -418,7 +418,7 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
struct page **pages;
u64 off = iocb->ki_pos;
int num_pages, ret;
- size_t len = i->count;
+ size_t len = iov_iter_count(i);
dout("sync_read on file %p %llu~%u %s\n", file, off,
(unsigned)len,
@@ -436,25 +436,26 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
if (file->f_flags & O_DIRECT) {
while (iov_iter_count(i)) {
- void __user *data = i->iov[0].iov_base + i->iov_offset;
- size_t len = i->iov[0].iov_len - i->iov_offset;
+ size_t start;
+ ssize_t n;
- num_pages = calc_pages_for((unsigned long)data, len);
- pages = ceph_get_direct_page_vector(data,
- num_pages, true);
- if (IS_ERR(pages))
- return PTR_ERR(pages);
+ n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start);
+ if (n < 0)
+ return n;
- ret = striped_read(inode, off, len,
+ num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
+
+ ret = striped_read(inode, off, n,
pages, num_pages, checkeof,
- 1, (unsigned long)data & ~PAGE_MASK);
+ 1, start);
+
ceph_put_page_vector(pages, num_pages, true);
if (ret <= 0)
break;
off += ret;
iov_iter_advance(i, ret);
- if (ret < len)
+ if (ret < n)
break;
}
} else {
@@ -466,25 +467,14 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
num_pages, checkeof, 0, 0);
if (ret > 0) {
int l, k = 0;
- size_t left = len = ret;
+ size_t left = ret;
while (left) {
- void __user *data = i->iov[0].iov_base
- + i->iov_offset;
- l = min(i->iov[0].iov_len - i->iov_offset,
- left);
-
- ret = ceph_copy_page_vector_to_user(&pages[k],
- data, off,
- l);
- if (ret > 0) {
- iov_iter_advance(i, ret);
- left -= ret;
- off += ret;
- k = calc_pages_for(iocb->ki_pos,
- len - left + 1) - 1;
- BUG_ON(k >= num_pages && left);
- } else
+ int copy = min_t(size_t, PAGE_SIZE, left);
+ l = copy_page_to_iter(pages[k++], 0, copy, i);
+ off += l;
+ left -= l;
+ if (l < copy)
break;
}
}
@@ -541,8 +531,7 @@ static void ceph_sync_write_unsafe(struct ceph_osd_request *req, bool unsafe)
* objects, rollback on failure, etc.)
*/
static ssize_t
-ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, size_t count)
+ceph_sync_direct_write(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
@@ -556,11 +545,10 @@ ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
int written = 0;
int flags;
int check_caps = 0;
- int page_align;
int ret;
struct timespec mtime = CURRENT_TIME;
loff_t pos = iocb->ki_pos;
- struct iov_iter i;
+ size_t count = iov_iter_count(from);
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
return -EROFS;
@@ -582,13 +570,10 @@ ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
CEPH_OSD_FLAG_ONDISK |
CEPH_OSD_FLAG_WRITE;
- iov_iter_init(&i, iov, nr_segs, count, 0);
-
- while (iov_iter_count(&i) > 0) {
- void __user *data = i.iov->iov_base + i.iov_offset;
- u64 len = i.iov->iov_len - i.iov_offset;
-
- page_align = (unsigned long)data & ~PAGE_MASK;
+ while (iov_iter_count(from) > 0) {
+ u64 len = iov_iter_single_seg_count(from);
+ size_t start;
+ ssize_t n;
snapc = ci->i_snap_realm->cached_context;
vino = ceph_vino(inode);
@@ -604,20 +589,21 @@ ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
break;
}
- num_pages = calc_pages_for(page_align, len);
- pages = ceph_get_direct_page_vector(data, num_pages, false);
- if (IS_ERR(pages)) {
- ret = PTR_ERR(pages);
- goto out;
+ n = iov_iter_get_pages_alloc(from, &pages, len, &start);
+ if (unlikely(n < 0)) {
+ ret = n;
+ ceph_osdc_put_request(req);
+ break;
}
+ num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
/*
* throw out any page cache pages in this range. this
* may block.
*/
truncate_inode_pages_range(inode->i_mapping, pos,
- (pos+len) | (PAGE_CACHE_SIZE-1));
- osd_req_op_extent_osd_data_pages(req, 0, pages, len, page_align,
+ (pos+n) | (PAGE_CACHE_SIZE-1));
+ osd_req_op_extent_osd_data_pages(req, 0, pages, n, start,
false, false);
/* BUG_ON(vino.snap != CEPH_NOSNAP); */
@@ -629,22 +615,20 @@ ceph_sync_direct_write(struct kiocb *iocb, const struct iovec *iov,
ceph_put_page_vector(pages, num_pages, false);
-out:
ceph_osdc_put_request(req);
- if (ret == 0) {
- pos += len;
- written += len;
- iov_iter_advance(&i, (size_t)len);
-
- if (pos > i_size_read(inode)) {
- check_caps = ceph_inode_set_size(inode, pos);
- if (check_caps)
- ceph_check_caps(ceph_inode(inode),
- CHECK_CAPS_AUTHONLY,
- NULL);
- }
- } else
+ if (ret)
break;
+ pos += n;
+ written += n;
+ iov_iter_advance(from, n);
+
+ if (pos > i_size_read(inode)) {
+ check_caps = ceph_inode_set_size(inode, pos);
+ if (check_caps)
+ ceph_check_caps(ceph_inode(inode),
+ CHECK_CAPS_AUTHONLY,
+ NULL);
+ }
}
if (ret != -EOLDSNAPC && written > 0) {
@@ -662,8 +646,7 @@ out:
* correct atomic write, we should e.g. take write locks on all
* objects, rollback on failure, etc.)
*/
-static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, size_t count)
+static ssize_t ceph_sync_write(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
@@ -681,7 +664,7 @@ static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
int ret;
struct timespec mtime = CURRENT_TIME;
loff_t pos = iocb->ki_pos;
- struct iov_iter i;
+ size_t count = iov_iter_count(from);
if (ceph_snap(file_inode(file)) != CEPH_NOSNAP)
return -EROFS;
@@ -703,9 +686,7 @@ static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
CEPH_OSD_FLAG_WRITE |
CEPH_OSD_FLAG_ACK;
- iov_iter_init(&i, iov, nr_segs, count, 0);
-
- while ((len = iov_iter_count(&i)) > 0) {
+ while ((len = iov_iter_count(from)) > 0) {
size_t left;
int n;
@@ -737,13 +718,12 @@ static ssize_t ceph_sync_write(struct kiocb *iocb, const struct iovec *iov,
left = len;
for (n = 0; n < num_pages; n++) {
size_t plen = min_t(size_t, left, PAGE_SIZE);
- ret = iov_iter_copy_from_user(pages[n], &i, 0, plen);
+ ret = copy_page_from_iter(pages[n], 0, plen, from);
if (ret != plen) {
ret = -EFAULT;
break;
}
left -= ret;
- iov_iter_advance(&i, ret);
}
if (ret < 0) {
@@ -796,8 +776,7 @@ out:
*
* Hmm, the sync read case isn't actually async... should it be?
*/
-static ssize_t ceph_aio_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct file *filp = iocb->ki_filp;
struct ceph_file_info *fi = filp->private_data;
@@ -823,40 +802,20 @@ again:
if ((got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(iocb->ki_filp->f_flags & O_DIRECT) ||
(fi->flags & CEPH_F_SYNC)) {
- struct iov_iter i;
dout("aio_sync_read %p %llx.%llx %llu~%u got cap refs on %s\n",
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
- if (!read) {
- ret = generic_segment_checks(iov, &nr_segs,
- &len, VERIFY_WRITE);
- if (ret)
- goto out;
- }
-
- iov_iter_init(&i, iov, nr_segs, len, read);
-
/* hmm, this isn't really async... */
- ret = ceph_sync_read(iocb, &i, &checkeof);
+ ret = ceph_sync_read(iocb, to, &checkeof);
} else {
- /*
- * We can't modify the content of iov,
- * so we only read from beginning.
- */
- if (read) {
- iocb->ki_pos = pos;
- len = iocb->ki_nbytes;
- read = 0;
- }
dout("aio_read %p %llx.%llx %llu~%u got cap refs on %s\n",
- inode, ceph_vinop(inode), pos, (unsigned)len,
+ inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
- ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
+ ret = generic_file_read_iter(iocb, to);
}
-out:
dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
ceph_put_cap_refs(ci, got);
@@ -872,6 +831,7 @@ out:
", reading more\n", iocb->ki_pos,
inode->i_size);
+ iov_iter_advance(to, ret);
read += ret;
len -= ret;
checkeof = 0;
@@ -895,8 +855,7 @@ out:
*
* If we are near ENOSPC, write synchronously.
*/
-static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct ceph_file_info *fi = file->private_data;
@@ -904,18 +863,15 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_osd_client *osdc =
&ceph_sb_to_client(inode->i_sb)->client->osdc;
- ssize_t count, written = 0;
+ ssize_t count = iov_iter_count(from), written = 0;
int err, want, got;
+ loff_t pos = iocb->ki_pos;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
mutex_lock(&inode->i_mutex);
- err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
- if (err)
- goto out;
-
/* We can write back this queue in page reclaim */
current->backing_dev_info = file->f_mapping->backing_dev_info;
@@ -925,6 +881,7 @@ static ssize_t ceph_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (count == 0)
goto out;
+ iov_iter_truncate(from, count);
err = file_remove_suid(file);
if (err)
@@ -956,23 +913,26 @@ retry_snap:
if ((got & (CEPH_CAP_FILE_BUFFER|CEPH_CAP_FILE_LAZYIO)) == 0 ||
(file->f_flags & O_DIRECT) || (fi->flags & CEPH_F_SYNC)) {
+ struct iov_iter data;
mutex_unlock(&inode->i_mutex);
+ /* we might need to revert back to that point */
+ data = *from;
if (file->f_flags & O_DIRECT)
- written = ceph_sync_direct_write(iocb, iov,
- nr_segs, count);
+ written = ceph_sync_direct_write(iocb, &data);
else
- written = ceph_sync_write(iocb, iov, nr_segs, count);
+ written = ceph_sync_write(iocb, &data);
if (written == -EOLDSNAPC) {
dout("aio_write %p %llx.%llx %llu~%u"
"got EOLDSNAPC, retrying\n",
inode, ceph_vinop(inode),
- pos, (unsigned)iov->iov_len);
+ pos, (unsigned)count);
mutex_lock(&inode->i_mutex);
goto retry_snap;
}
+ if (written > 0)
+ iov_iter_advance(from, written);
} else {
loff_t old_size = inode->i_size;
- struct iov_iter from;
/*
* No need to acquire the i_truncate_mutex. Because
* the MDS revokes Fwb caps before sending truncate
@@ -980,8 +940,7 @@ retry_snap:
* are pending vmtruncate. So write and vmtruncate
* can not run at the same time
*/
- iov_iter_init(&from, iov, nr_segs, count, 0);
- written = generic_perform_write(file, &from, pos);
+ written = generic_perform_write(file, from, pos);
if (likely(written >= 0))
iocb->ki_pos = pos + written;
if (inode->i_size > old_size)
@@ -999,7 +958,7 @@ retry_snap:
}
dout("aio_write %p %llx.%llx %llu~%u dropping cap refs on %s\n",
- inode, ceph_vinop(inode), pos, (unsigned)iov->iov_len,
+ inode, ceph_vinop(inode), pos, (unsigned)count,
ceph_cap_string(got));
ceph_put_cap_refs(ci, got);
@@ -1276,16 +1235,16 @@ const struct file_operations ceph_file_fops = {
.open = ceph_open,
.release = ceph_release,
.llseek = ceph_llseek,
- .read = do_sync_read,
- .write = do_sync_write,
- .aio_read = ceph_aio_read,
- .aio_write = ceph_aio_write,
+ .read = new_sync_read,
+ .write = new_sync_write,
+ .read_iter = ceph_read_iter,
+ .write_iter = ceph_write_iter,
.mmap = ceph_mmap,
.fsync = ceph_fsync,
.lock = ceph_lock,
.flock = ceph_flock,
.splice_read = generic_file_splice_read,
- .splice_write = generic_file_splice_write,
+ .splice_write = iter_file_splice_write,
.unlocked_ioctl = ceph_ioctl,
.compat_ioctl = ceph_ioctl,
.fallocate = ceph_fallocate,