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-rw-r--r--fs/nfsd/vfs.c155
1 files changed, 79 insertions, 76 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 16f0673a423..140c496f612 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -820,55 +820,54 @@ static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe,
return __splice_from_pipe(pipe, sd, nfsd_splice_actor);
}
-static __be32
-nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
- loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
+__be32 nfsd_finish_read(struct file *file, unsigned long *count, int host_err)
{
- mm_segment_t oldfs;
- __be32 err;
- int host_err;
-
- err = nfserr_perm;
-
- if (file->f_op->splice_read && rqstp->rq_splice_ok) {
- struct splice_desc sd = {
- .len = 0,
- .total_len = *count,
- .pos = offset,
- .u.data = rqstp,
- };
-
- rqstp->rq_next_page = rqstp->rq_respages + 1;
- host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
- } else {
- oldfs = get_fs();
- set_fs(KERNEL_DS);
- host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
- set_fs(oldfs);
- }
-
if (host_err >= 0) {
nfsdstats.io_read += host_err;
*count = host_err;
- err = 0;
fsnotify_access(file);
+ return 0;
} else
- err = nfserrno(host_err);
- return err;
+ return nfserrno(host_err);
+}
+
+int nfsd_splice_read(struct svc_rqst *rqstp,
+ struct file *file, loff_t offset, unsigned long *count)
+{
+ struct splice_desc sd = {
+ .len = 0,
+ .total_len = *count,
+ .pos = offset,
+ .u.data = rqstp,
+ };
+ int host_err;
+
+ rqstp->rq_next_page = rqstp->rq_respages + 1;
+ host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor);
+ return nfsd_finish_read(file, count, host_err);
}
-static void kill_suid(struct dentry *dentry)
+int nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen,
+ unsigned long *count)
{
- struct iattr ia;
- ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
+ mm_segment_t oldfs;
+ int host_err;
- mutex_lock(&dentry->d_inode->i_mutex);
- /*
- * Note we call this on write, so notify_change will not
- * encounter any conflicting delegations:
- */
- notify_change(dentry, &ia, NULL);
- mutex_unlock(&dentry->d_inode->i_mutex);
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset);
+ set_fs(oldfs);
+ return nfsd_finish_read(file, count, host_err);
+}
+
+static __be32
+nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file,
+ loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
+{
+ if (file->f_op->splice_read && rqstp->rq_splice_ok)
+ return nfsd_splice_read(rqstp, file, offset, count);
+ else
+ return nfsd_readv(file, offset, vec, vlen, count);
}
/*
@@ -922,6 +921,16 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
int stable = *stablep;
int use_wgather;
loff_t pos = offset;
+ unsigned int pflags = current->flags;
+
+ if (rqstp->rq_local)
+ /*
+ * We want less throttling in balance_dirty_pages()
+ * and shrink_inactive_list() so that nfs to
+ * localhost doesn't cause nfsd to lock up due to all
+ * the client's dirty pages or its congested queue.
+ */
+ current->flags |= PF_LESS_THROTTLE;
dentry = file->f_path.dentry;
inode = dentry->d_inode;
@@ -942,10 +951,6 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
nfsdstats.io_write += host_err;
fsnotify_modify(file);
- /* clear setuid/setgid flag after write */
- if (inode->i_mode & (S_ISUID | S_ISGID))
- kill_suid(dentry);
-
if (stable) {
if (use_wgather)
host_err = wait_for_concurrent_writes(file);
@@ -959,36 +964,33 @@ out_nfserr:
err = 0;
else
err = nfserrno(host_err);
+ if (rqstp->rq_local)
+ tsk_restore_flags(current, pflags, PF_LESS_THROTTLE);
return err;
}
-/*
- * Read data from a file. count must contain the requested read count
- * on entry. On return, *count contains the number of bytes actually read.
- * N.B. After this call fhp needs an fh_put
- */
-__be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
- loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
+__be32 nfsd_get_tmp_read_open(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct file **file, struct raparms **ra)
{
- struct file *file;
struct inode *inode;
- struct raparms *ra;
__be32 err;
- err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
+ err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, file);
if (err)
return err;
- inode = file_inode(file);
+ inode = file_inode(*file);
/* Get readahead parameters */
- ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
+ *ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino);
- if (ra && ra->p_set)
- file->f_ra = ra->p_ra;
-
- err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
+ if (*ra && (*ra)->p_set)
+ (*file)->f_ra = (*ra)->p_ra;
+ return nfs_ok;
+}
+void nfsd_put_tmp_read_open(struct file *file, struct raparms *ra)
+{
/* Write back readahead params */
if (ra) {
struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex];
@@ -998,28 +1000,29 @@ __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
ra->p_count--;
spin_unlock(&rab->pb_lock);
}
-
nfsd_close(file);
- return err;
}
-/* As above, but use the provided file descriptor. */
-__be32
-nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
- loff_t offset, struct kvec *vec, int vlen,
- unsigned long *count)
+/*
+ * Read data from a file. count must contain the requested read count
+ * on entry. On return, *count contains the number of bytes actually read.
+ * N.B. After this call fhp needs an fh_put
+ */
+__be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ loff_t offset, struct kvec *vec, int vlen, unsigned long *count)
{
- __be32 err;
+ struct file *file;
+ struct raparms *ra;
+ __be32 err;
+
+ err = nfsd_get_tmp_read_open(rqstp, fhp, &file, &ra);
+ if (err)
+ return err;
+
+ err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count);
+
+ nfsd_put_tmp_read_open(file, ra);
- if (file) {
- err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
- NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE);
- if (err)
- goto out;
- err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count);
- } else /* Note file may still be NULL in NFSv4 special stateid case: */
- err = nfsd_read(rqstp, fhp, offset, vec, vlen, count);
-out:
return err;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-15 00:22:54 +0000