#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/mm.h>
-#include <linux/slab.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
+#include <linux/aio.h>
+#include <linux/gfp.h>
+#include <linux/swap.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include "delegation.h"
+#include "internal.h"
#include "iostat.h"
+#include "fscache.h"
#define NFSDBG_FACILITY NFSDBG_FILE
static int nfs_file_release(struct inode *, struct file *);
static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
static int nfs_file_mmap(struct file *, struct vm_area_struct *);
-static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
-static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t);
-static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t);
+static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos,
+ struct pipe_inode_info *pipe,
+ size_t count, unsigned int flags);
+static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
+static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
+ struct file *filp, loff_t *ppos,
+ size_t count, unsigned int flags);
+static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
static int nfs_file_flush(struct file *, fl_owner_t id);
-static int nfs_fsync(struct file *, struct dentry *dentry, int datasync);
+static int nfs_file_fsync(struct file *, int datasync);
static int nfs_check_flags(int flags);
static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
+static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
+
+static const struct vm_operations_struct nfs_file_vm_ops;
const struct file_operations nfs_file_operations = {
.llseek = nfs_file_llseek,
.read = do_sync_read,
.write = do_sync_write,
- .aio_read = nfs_file_read,
- .aio_write = nfs_file_write,
+ .aio_read = nfs_file_read,
+ .aio_write = nfs_file_write,
.mmap = nfs_file_mmap,
.open = nfs_file_open,
.flush = nfs_file_flush,
.release = nfs_file_release,
- .fsync = nfs_fsync,
+ .fsync = nfs_file_fsync,
.lock = nfs_lock,
.flock = nfs_flock,
- .sendfile = nfs_file_sendfile,
+ .splice_read = nfs_file_splice_read,
+ .splice_write = nfs_file_splice_write,
.check_flags = nfs_check_flags,
+ .setlease = nfs_setlease,
};
-struct inode_operations nfs_file_inode_operations = {
+const struct inode_operations nfs_file_inode_operations = {
.permission = nfs_permission,
.getattr = nfs_getattr,
.setattr = nfs_setattr,
};
#ifdef CONFIG_NFS_V3
-struct inode_operations nfs3_file_inode_operations = {
+const struct inode_operations nfs3_file_inode_operations = {
.permission = nfs_permission,
.getattr = nfs_getattr,
.setattr = nfs_setattr,
{
int res;
+ dprintk("NFS: open file(%s/%s)\n",
+ filp->f_path.dentry->d_parent->d_name.name,
+ filp->f_path.dentry->d_name.name);
+
+ nfs_inc_stats(inode, NFSIOS_VFSOPEN);
res = nfs_check_flags(filp->f_flags);
if (res)
return res;
- nfs_inc_stats(inode, NFSIOS_VFSOPEN);
- lock_kernel();
- res = NFS_PROTO(inode)->file_open(inode, filp);
- unlock_kernel();
+ res = nfs_open(inode, filp);
return res;
}
static int
nfs_file_release(struct inode *inode, struct file *filp)
{
- /* Ensure that dirty pages are flushed out with the right creds */
- if (filp->f_mode & FMODE_WRITE)
- filemap_fdatawrite(filp->f_mapping);
+ struct dentry *dentry = filp->f_path.dentry;
+
+ dprintk("NFS: release(%s/%s)\n",
+ dentry->d_parent->d_name.name,
+ dentry->d_name.name);
+
nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
- return NFS_PROTO(inode)->file_release(inode, filp);
+ return nfs_release(inode, filp);
}
/**
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_inode *nfsi = NFS_I(inode);
- if (server->flags & NFS_MOUNT_NOAC)
- goto force_reval;
+ if (nfs_have_delegated_attributes(inode))
+ goto out_noreval;
+
if (filp->f_flags & O_DIRECT)
goto force_reval;
- if (nfsi->npages != 0)
- return 0;
- if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode))
- return 0;
+ if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
+ goto force_reval;
+ if (nfs_attribute_timeout(inode))
+ goto force_reval;
+out_noreval:
+ return 0;
force_reval:
return __nfs_revalidate_inode(server, inode);
}
static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
{
+ loff_t loff;
+
+ dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
+ filp->f_path.dentry->d_parent->d_name.name,
+ filp->f_path.dentry->d_name.name,
+ offset, origin);
+
/* origin == SEEK_END => we must revalidate the cached file length */
- if (origin == 2) {
+ if (origin == SEEK_END) {
struct inode *inode = filp->f_mapping->host;
+
int retval = nfs_revalidate_file_size(inode, filp);
if (retval < 0)
return (loff_t)retval;
- }
- return remote_llseek(filp, offset, origin);
+
+ spin_lock(&inode->i_lock);
+ loff = generic_file_llseek_unlocked(filp, offset, origin);
+ spin_unlock(&inode->i_lock);
+ } else
+ loff = generic_file_llseek_unlocked(filp, offset, origin);
+ return loff;
}
/*
- * Flush all dirty pages, and check for write errors.
+ * Helper for nfs_file_flush() and nfs_file_fsync()
*
+ * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
+ * disk, but it retrieves and clears ctx->error after synching, despite
+ * the two being set at the same time in nfs_context_set_write_error().
+ * This is because the former is used to notify the _next_ call to
+ * nfs_file_write() that a write error occured, and hence cause it to
+ * fall back to doing a synchronous write.
+ */
+static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode)
+{
+ int have_error, status;
+ int ret = 0;
+
+ have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
+ status = nfs_wb_all(inode);
+ have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
+ if (have_error)
+ ret = xchg(&ctx->error, 0);
+ if (!ret)
+ ret = status;
+ return ret;
+}
+
+/*
+ * Flush all dirty pages, and check for write errors.
*/
static int
nfs_file_flush(struct file *file, fl_owner_t id)
{
- struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
- struct inode *inode = file->f_dentry->d_inode;
- int status;
+ struct nfs_open_context *ctx = nfs_file_open_context(file);
+ struct dentry *dentry = file->f_path.dentry;
+ struct inode *inode = dentry->d_inode;
- dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
+ dprintk("NFS: flush(%s/%s)\n",
+ dentry->d_parent->d_name.name,
+ dentry->d_name.name);
+ nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
if ((file->f_mode & FMODE_WRITE) == 0)
return 0;
- nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
- lock_kernel();
- /* Ensure that data+attribute caches are up to date after close() */
- status = nfs_wb_all(inode);
- if (!status) {
- status = ctx->error;
- ctx->error = 0;
- if (!status)
- nfs_revalidate_inode(NFS_SERVER(inode), inode);
- }
- unlock_kernel();
- return status;
+
+ /* Flush writes to the server and return any errors */
+ return nfs_do_fsync(ctx, inode);
}
static ssize_t
-nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos)
+nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
{
- struct dentry * dentry = iocb->ki_filp->f_dentry;
+ struct dentry * dentry = iocb->ki_filp->f_path.dentry;
struct inode * inode = dentry->d_inode;
ssize_t result;
+ size_t count = iov_length(iov, nr_segs);
-#ifdef CONFIG_NFS_DIRECTIO
if (iocb->ki_filp->f_flags & O_DIRECT)
- return nfs_file_direct_read(iocb, buf, count, pos);
-#endif
+ return nfs_file_direct_read(iocb, iov, nr_segs, pos);
- dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n",
+ dprintk("NFS: read(%s/%s, %lu@%lu)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
(unsigned long) count, (unsigned long) pos);
result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
- nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count);
- if (!result)
- result = generic_file_aio_read(iocb, buf, count, pos);
+ if (!result) {
+ result = generic_file_aio_read(iocb, iov, nr_segs, pos);
+ if (result > 0)
+ nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
+ }
return result;
}
static ssize_t
-nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count,
- read_actor_t actor, void *target)
+nfs_file_splice_read(struct file *filp, loff_t *ppos,
+ struct pipe_inode_info *pipe, size_t count,
+ unsigned int flags)
{
- struct dentry *dentry = filp->f_dentry;
+ struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
ssize_t res;
- dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n",
+ dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
(unsigned long) count, (unsigned long long) *ppos);
res = nfs_revalidate_mapping(inode, filp->f_mapping);
- if (!res)
- res = generic_file_sendfile(filp, ppos, count, actor, target);
+ if (!res) {
+ res = generic_file_splice_read(filp, ppos, pipe, count, flags);
+ if (res > 0)
+ nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
+ }
return res;
}
static int
nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
{
- struct dentry *dentry = file->f_dentry;
+ struct dentry *dentry = file->f_path.dentry;
struct inode *inode = dentry->d_inode;
int status;
- dfprintk(VFS, "nfs: mmap(%s/%s)\n",
+ dprintk("NFS: mmap(%s/%s)\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
- status = nfs_revalidate_mapping(inode, file->f_mapping);
- if (!status)
- status = generic_file_mmap(file, vma);
+ /* Note: generic_file_mmap() returns ENOSYS on nommu systems
+ * so we call that before revalidating the mapping
+ */
+ status = generic_file_mmap(file, vma);
+ if (!status) {
+ vma->vm_ops = &nfs_file_vm_ops;
+ status = nfs_revalidate_mapping(inode, file->f_mapping);
+ }
return status;
}
* whether any write errors occurred for this process.
*/
static int
-nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
+nfs_file_fsync(struct file *file, int datasync)
{
- struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
+ struct dentry *dentry = file->f_path.dentry;
+ struct nfs_open_context *ctx = nfs_file_open_context(file);
struct inode *inode = dentry->d_inode;
- int status;
- dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
+ dprintk("NFS: fsync file(%s/%s) datasync %d\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name,
+ datasync);
nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
- lock_kernel();
- status = nfs_wb_all(inode);
- if (!status) {
- status = ctx->error;
- ctx->error = 0;
- }
- unlock_kernel();
- return status;
+ return nfs_do_fsync(ctx, inode);
}
/*
- * This does the "real" work of the write. The generic routine has
- * allocated the page, locked it, done all the page alignment stuff
- * calculations etc. Now we should just copy the data from user
- * space and write it back to the real medium..
+ * Decide whether a read/modify/write cycle may be more efficient
+ * then a modify/write/read cycle when writing to a page in the
+ * page cache.
+ *
+ * The modify/write/read cycle may occur if a page is read before
+ * being completely filled by the writer. In this situation, the
+ * page must be completely written to stable storage on the server
+ * before it can be refilled by reading in the page from the server.
+ * This can lead to expensive, small, FILE_SYNC mode writes being
+ * done.
+ *
+ * It may be more efficient to read the page first if the file is
+ * open for reading in addition to writing, the page is not marked
+ * as Uptodate, it is not dirty or waiting to be committed,
+ * indicating that it was previously allocated and then modified,
+ * that there were valid bytes of data in that range of the file,
+ * and that the new data won't completely replace the old data in
+ * that range of the file.
+ */
+static int nfs_want_read_modify_write(struct file *file, struct page *page,
+ loff_t pos, unsigned len)
+{
+ unsigned int pglen = nfs_page_length(page);
+ unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
+ unsigned int end = offset + len;
+
+ if ((file->f_mode & FMODE_READ) && /* open for read? */
+ !PageUptodate(page) && /* Uptodate? */
+ !PagePrivate(page) && /* i/o request already? */
+ pglen && /* valid bytes of file? */
+ (end < pglen || offset)) /* replace all valid bytes? */
+ return 1;
+ return 0;
+}
+
+/*
+ * This does the "real" work of the write. We must allocate and lock the
+ * page to be sent back to the generic routine, which then copies the
+ * data from user space.
*
* If the writer ends up delaying the write, the writer needs to
* increment the page use counts until he is done with the page.
*/
-static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+static int nfs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
{
- return nfs_flush_incompatible(file, page);
+ int ret;
+ pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+ struct page *page;
+ int once_thru = 0;
+
+ dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
+ file->f_path.dentry->d_parent->d_name.name,
+ file->f_path.dentry->d_name.name,
+ mapping->host->i_ino, len, (long long) pos);
+
+start:
+ /*
+ * Prevent starvation issues if someone is doing a consistency
+ * sync-to-disk
+ */
+ ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
+ nfs_wait_bit_killable, TASK_KILLABLE);
+ if (ret)
+ return ret;
+
+ page = grab_cache_page_write_begin(mapping, index, flags);
+ if (!page)
+ return -ENOMEM;
+ *pagep = page;
+
+ ret = nfs_flush_incompatible(file, page);
+ if (ret) {
+ unlock_page(page);
+ page_cache_release(page);
+ } else if (!once_thru &&
+ nfs_want_read_modify_write(file, page, pos, len)) {
+ once_thru = 1;
+ ret = nfs_readpage(file, page);
+ page_cache_release(page);
+ if (!ret)
+ goto start;
+ }
+ return ret;
}
-static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
+static int nfs_write_end(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned copied,
+ struct page *page, void *fsdata)
{
- long status;
+ unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
+ int status;
- lock_kernel();
- status = nfs_updatepage(file, page, offset, to-offset);
- unlock_kernel();
- return status;
+ dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
+ file->f_path.dentry->d_parent->d_name.name,
+ file->f_path.dentry->d_name.name,
+ mapping->host->i_ino, len, (long long) pos);
+
+ /*
+ * Zero any uninitialised parts of the page, and then mark the page
+ * as up to date if it turns out that we're extending the file.
+ */
+ if (!PageUptodate(page)) {
+ unsigned pglen = nfs_page_length(page);
+ unsigned end = offset + len;
+
+ if (pglen == 0) {
+ zero_user_segments(page, 0, offset,
+ end, PAGE_CACHE_SIZE);
+ SetPageUptodate(page);
+ } else if (end >= pglen) {
+ zero_user_segment(page, end, PAGE_CACHE_SIZE);
+ if (offset == 0)
+ SetPageUptodate(page);
+ } else
+ zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
+ }
+
+ status = nfs_updatepage(file, page, offset, copied);
+
+ unlock_page(page);
+ page_cache_release(page);
+
+ if (status < 0)
+ return status;
+ return copied;
}
+/*
+ * Partially or wholly invalidate a page
+ * - Release the private state associated with a page if undergoing complete
+ * page invalidation
+ * - Called if either PG_private or PG_fscache is set on the page
+ * - Caller holds page lock
+ */
static void nfs_invalidate_page(struct page *page, unsigned long offset)
{
- struct inode *inode = page->mapping->host;
+ dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
+ if (offset != 0)
+ return;
/* Cancel any unstarted writes on this page */
- if (offset == 0)
- nfs_sync_inode_wait(inode, page->index, 1, FLUSH_INVALIDATE);
+ nfs_wb_page_cancel(page->mapping->host, page);
+
+ nfs_fscache_invalidate_page(page, page->mapping->host);
}
+/*
+ * Attempt to release the private state associated with a page
+ * - Called if either PG_private or PG_fscache is set on the page
+ * - Caller holds page lock
+ * - Return true (may release page) or false (may not)
+ */
static int nfs_release_page(struct page *page, gfp_t gfp)
{
- if (gfp & __GFP_FS)
- return !nfs_wb_page(page->mapping->host, page);
- else
- /*
- * Avoid deadlock on nfs_wait_on_request().
- */
+ struct address_space *mapping = page->mapping;
+
+ dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
+
+ /* Only do I/O if gfp is a superset of GFP_KERNEL */
+ if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
+ int how = FLUSH_SYNC;
+
+ /* Don't let kswapd deadlock waiting for OOM RPC calls */
+ if (current_is_kswapd())
+ how = 0;
+ nfs_commit_inode(mapping->host, how);
+ }
+ /* If PagePrivate() is set, then the page is not freeable */
+ if (PagePrivate(page))
return 0;
+ return nfs_fscache_release_page(page, gfp);
+}
+
+/*
+ * Attempt to clear the private state associated with a page when an error
+ * occurs that requires the cached contents of an inode to be written back or
+ * destroyed
+ * - Called if either PG_private or fscache is set on the page
+ * - Caller holds page lock
+ * - Return 0 if successful, -error otherwise
+ */
+static int nfs_launder_page(struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
+ inode->i_ino, (long long)page_offset(page));
+
+ nfs_fscache_wait_on_page_write(nfsi, page);
+ return nfs_wb_page(inode, page);
}
const struct address_space_operations nfs_file_aops = {
.set_page_dirty = __set_page_dirty_nobuffers,
.writepage = nfs_writepage,
.writepages = nfs_writepages,
- .prepare_write = nfs_prepare_write,
- .commit_write = nfs_commit_write,
+ .write_begin = nfs_write_begin,
+ .write_end = nfs_write_end,
.invalidatepage = nfs_invalidate_page,
.releasepage = nfs_release_page,
-#ifdef CONFIG_NFS_DIRECTIO
.direct_IO = nfs_direct_IO,
-#endif
+ .migratepage = nfs_migrate_page,
+ .launder_page = nfs_launder_page,
+ .error_remove_page = generic_error_remove_page,
};
-/*
- * Write to a file (through the page cache).
+/*
+ * Notification that a PTE pointing to an NFS page is about to be made
+ * writable, implying that someone is about to modify the page through a
+ * shared-writable mapping
*/
-static ssize_t
-nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
+static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
- struct dentry * dentry = iocb->ki_filp->f_dentry;
+ struct page *page = vmf->page;
+ struct file *filp = vma->vm_file;
+ struct dentry *dentry = filp->f_path.dentry;
+ unsigned pagelen;
+ int ret = -EINVAL;
+ struct address_space *mapping;
+
+ dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name,
+ filp->f_mapping->host->i_ino,
+ (long long)page_offset(page));
+
+ /* make sure the cache has finished storing the page */
+ nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
+
+ lock_page(page);
+ mapping = page->mapping;
+ if (mapping != dentry->d_inode->i_mapping)
+ goto out_unlock;
+
+ ret = 0;
+ pagelen = nfs_page_length(page);
+ if (pagelen == 0)
+ goto out_unlock;
+
+ ret = nfs_flush_incompatible(filp, page);
+ if (ret != 0)
+ goto out_unlock;
+
+ ret = nfs_updatepage(filp, page, 0, pagelen);
+out_unlock:
+ if (!ret)
+ return VM_FAULT_LOCKED;
+ unlock_page(page);
+ return VM_FAULT_SIGBUS;
+}
+
+static const struct vm_operations_struct nfs_file_vm_ops = {
+ .fault = filemap_fault,
+ .page_mkwrite = nfs_vm_page_mkwrite,
+};
+
+static int nfs_need_sync_write(struct file *filp, struct inode *inode)
+{
+ struct nfs_open_context *ctx;
+
+ if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
+ return 1;
+ ctx = nfs_file_open_context(filp);
+ if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
+ return 1;
+ return 0;
+}
+
+static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct dentry * dentry = iocb->ki_filp->f_path.dentry;
struct inode * inode = dentry->d_inode;
+ unsigned long written = 0;
ssize_t result;
+ size_t count = iov_length(iov, nr_segs);
-#ifdef CONFIG_NFS_DIRECTIO
if (iocb->ki_filp->f_flags & O_DIRECT)
- return nfs_file_direct_write(iocb, buf, count, pos);
-#endif
+ return nfs_file_direct_write(iocb, iov, nr_segs, pos);
- dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%lu)\n",
+ dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
- inode->i_ino, (unsigned long) count, (unsigned long) pos);
+ (unsigned long) count, (long long) pos);
result = -EBUSY;
if (IS_SWAPFILE(inode))
if (!count)
goto out;
- nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count);
- result = generic_file_aio_write(iocb, buf, count, pos);
+ result = generic_file_aio_write(iocb, iov, nr_segs, pos);
+ if (result > 0)
+ written = result;
+
+ /* Return error values for O_DSYNC and IS_SYNC() */
+ if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
+ int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode);
+ if (err < 0)
+ result = err;
+ }
+ if (result > 0)
+ nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
out:
return result;
goto out;
}
+static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
+ struct file *filp, loff_t *ppos,
+ size_t count, unsigned int flags)
+{
+ struct dentry *dentry = filp->f_path.dentry;
+ struct inode *inode = dentry->d_inode;
+ unsigned long written = 0;
+ ssize_t ret;
+
+ dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
+ dentry->d_parent->d_name.name, dentry->d_name.name,
+ (unsigned long) count, (unsigned long long) *ppos);
+
+ /*
+ * The combination of splice and an O_APPEND destination is disallowed.
+ */
+
+ ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
+ if (ret > 0)
+ written = ret;
+
+ if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
+ int err = nfs_do_fsync(nfs_file_open_context(filp), inode);
+ if (err < 0)
+ ret = err;
+ }
+ if (ret > 0)
+ nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
+ return ret;
+}
+
static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
{
- struct file_lock cfl;
struct inode *inode = filp->f_mapping->host;
int status = 0;
- lock_kernel();
/* Try local locking first */
- if (posix_test_lock(filp, fl, &cfl)) {
- fl->fl_start = cfl.fl_start;
- fl->fl_end = cfl.fl_end;
- fl->fl_type = cfl.fl_type;
- fl->fl_pid = cfl.fl_pid;
+ posix_test_lock(filp, fl);
+ if (fl->fl_type != F_UNLCK) {
+ /* found a conflict */
goto out;
}
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
out:
- unlock_kernel();
return status;
out_noconflict:
fl->fl_type = F_UNLCK;
BUG();
}
if (res < 0)
- printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
- __FUNCTION__);
+ dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager"
+ " - error %d!\n",
+ __func__, res);
return res;
}
* If we're signalled while cleaning up locks on process exit, we
* still need to complete the unlock.
*/
- lock_kernel();
/* Use local locking if mounted with "-onolock" */
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
else
status = do_vfs_lock(filp, fl);
- unlock_kernel();
return status;
}
if (status != 0)
goto out;
- lock_kernel();
/* Use local locking if mounted with "-onolock" */
- if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
+ if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
- /* If we were signalled we still need to ensure that
- * we clean up any state on the server. We therefore
- * record the lock call as having succeeded in order to
- * ensure that locks_remove_posix() cleans it out when
- * the process exits.
- */
- if (status == -EINTR || status == -ERESTARTSYS)
- do_vfs_lock(filp, fl);
- } else
+ else
status = do_vfs_lock(filp, fl);
- unlock_kernel();
if (status < 0)
goto out;
/*
* This makes locking act as a cache coherency point.
*/
nfs_sync_mapping(filp->f_mapping);
- nfs_zap_caches(inode);
+ if (!nfs_have_delegation(inode, FMODE_READ))
+ nfs_zap_caches(inode);
out:
return status;
}
*/
static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
{
- struct inode * inode = filp->f_mapping->host;
+ struct inode *inode = filp->f_mapping->host;
+ int ret = -ENOLCK;
- dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
- inode->i_sb->s_id, inode->i_ino,
+ dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
+ filp->f_path.dentry->d_parent->d_name.name,
+ filp->f_path.dentry->d_name.name,
fl->fl_type, fl->fl_flags,
(long long)fl->fl_start, (long long)fl->fl_end);
+
nfs_inc_stats(inode, NFSIOS_VFSLOCK);
/* No mandatory locks over NFS */
- if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID &&
- fl->fl_type != F_UNLCK)
- return -ENOLCK;
+ if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
+ goto out_err;
+
+ if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
+ ret = NFS_PROTO(inode)->lock_check_bounds(fl);
+ if (ret < 0)
+ goto out_err;
+ }
if (IS_GETLK(cmd))
- return do_getlk(filp, cmd, fl);
- if (fl->fl_type == F_UNLCK)
- return do_unlk(filp, cmd, fl);
- return do_setlk(filp, cmd, fl);
+ ret = do_getlk(filp, cmd, fl);
+ else if (fl->fl_type == F_UNLCK)
+ ret = do_unlk(filp, cmd, fl);
+ else
+ ret = do_setlk(filp, cmd, fl);
+out_err:
+ return ret;
}
/*
*/
static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
{
- dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n",
- filp->f_dentry->d_inode->i_sb->s_id,
- filp->f_dentry->d_inode->i_ino,
+ dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
+ filp->f_path.dentry->d_parent->d_name.name,
+ filp->f_path.dentry->d_name.name,
fl->fl_type, fl->fl_flags);
- /*
- * No BSD flocks over NFS allowed.
- * Note: we could try to fake a POSIX lock request here by
- * using ((u32) filp | 0x80000000) or some such as the pid.
- * Not sure whether that would be unique, though, or whether
- * that would break in other places.
- */
if (!(fl->fl_flags & FL_FLOCK))
return -ENOLCK;
return do_unlk(filp, cmd, fl);
return do_setlk(filp, cmd, fl);
}
+
+/*
+ * There is no protocol support for leases, so we have no way to implement
+ * them correctly in the face of opens by other clients.
+ */
+static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
+{
+ dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
+ file->f_path.dentry->d_parent->d_name.name,
+ file->f_path.dentry->d_name.name, arg);
+
+ return -EINVAL;
+}
Code Review / linux-2.6.git / blobdiff