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authorLinus Torvalds <torvalds@linux-foundation.org>2013-07-11 12:11:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-11 12:11:35 -0700
commit1466b77a7be75144dee1cb09839be3435854dd0b (patch)
tree977a0b6c1cd69ff98e5027359bb7de7b8897276a /fs
parent19d2f8e0fb7bba99cc585d2467e9fa54a84c8557 (diff)
parenteeee245268c951262b861bc1be4e9dc812352499 (diff)
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Merge tag 'nfs-for-3.11-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull second set of NFS client updates from Trond Myklebust: "This mainly contains some small readdir optimisations that had dependencies on Al Viro's readdir rewrite. There is also a fix for a nasty deadlock which surfaced earlier in this merge window. Highlights include: - Fix an_rpc pipefs regression that causes a deadlock on mount - Readdir optimisations by Scott Mayhew and Jeff Layton - clean up the rpc_pipefs dentry operation setup" * tag 'nfs-for-3.11-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: SUNRPC: Fix a deadlock in rpc_client_register() rpc_pipe: rpc_dir_inode_operations can be static NFS: Allow nfs_updatepage to extend a write under additional circumstances NFS: Make nfs_readdir revalidate less often NFS: Make nfs_attribute_cache_expired() non-static rpc_pipe: set dentry operations at d_alloc time nfs: set verifier on existing dentries in nfs_prime_dcache
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/dir.c6
-rw-r--r--fs/nfs/inode.c2
-rw-r--r--fs/nfs/write.c31
3 files changed, 28 insertions, 11 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 0fac2cb1ea18..e474ca2b2bfe 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -450,6 +450,7 @@ void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry)
dentry = d_lookup(parent, &filename);
if (dentry != NULL) {
if (nfs_same_file(dentry, entry)) {
+ nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
status = nfs_refresh_inode(dentry->d_inode, entry->fattr);
if (!status)
nfs_setsecurity(dentry->d_inode, entry->fattr, entry->label);
@@ -817,7 +818,7 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
nfs_readdir_descriptor_t my_desc,
*desc = &my_desc;
struct nfs_open_dir_context *dir_ctx = file->private_data;
- int res;
+ int res = 0;
dfprintk(FILE, "NFS: readdir(%s/%s) starting at cookie %llu\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
@@ -839,7 +840,8 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx)
desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0;
nfs_block_sillyrename(dentry);
- res = nfs_revalidate_mapping(inode, file->f_mapping);
+ if (ctx->pos == 0 || nfs_attribute_cache_expired(inode))
+ res = nfs_revalidate_mapping(inode, file->f_mapping);
if (res < 0)
goto out;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index c93639e6cf68..af6e806044d7 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -936,7 +936,7 @@ int nfs_attribute_timeout(struct inode *inode)
return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
}
-static int nfs_attribute_cache_expired(struct inode *inode)
+int nfs_attribute_cache_expired(struct inode *inode)
{
if (nfs_have_delegated_attributes(inode))
return 0;
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index a2c7c28049d5..f1bdb7254776 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -888,6 +888,28 @@ out:
return PageUptodate(page) != 0;
}
+/* If we know the page is up to date, and we're not using byte range locks (or
+ * if we have the whole file locked for writing), it may be more efficient to
+ * extend the write to cover the entire page in order to avoid fragmentation
+ * inefficiencies.
+ *
+ * If the file is opened for synchronous writes or if we have a write delegation
+ * from the server then we can just skip the rest of the checks.
+ */
+static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
+{
+ if (file->f_flags & O_DSYNC)
+ return 0;
+ if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
+ return 1;
+ if (nfs_write_pageuptodate(page, inode) && (inode->i_flock == NULL ||
+ (inode->i_flock->fl_start == 0 &&
+ inode->i_flock->fl_end == OFFSET_MAX &&
+ inode->i_flock->fl_type != F_RDLCK)))
+ return 1;
+ return 0;
+}
+
/*
* Update and possibly write a cached page of an NFS file.
*
@@ -908,14 +930,7 @@ int nfs_updatepage(struct file *file, struct page *page,
file->f_path.dentry->d_name.name, count,
(long long)(page_file_offset(page) + offset));
- /* If we're not using byte range locks, and we know the page
- * is up to date, it may be more efficient to extend the write
- * to cover the entire page in order to avoid fragmentation
- * inefficiencies.
- */
- if (nfs_write_pageuptodate(page, inode) &&
- inode->i_flock == NULL &&
- !(file->f_flags & O_DSYNC)) {
+ if (nfs_can_extend_write(file, page, inode)) {
count = max(count + offset, nfs_page_length(page));
offset = 0;
}