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Message-Id: <1351389176-2520-1-git-send-email-linkinjeon@gmail.com>
Date: Sun, 28 Oct 2012 10:52:56 +0900
From: Namjae Jeon <linkinjeon@...il.com>
To: hirofumi@...l.parknet.co.jp, akpm@...ux-foundation.org
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Namjae Jeon <linkinjeon@...il.com>,
Namjae Jeon <namjae.jeon@...sung.com>,
Ravishankar N <ravi.n1@...sung.com>,
Amit Sahrawat <a.sahrawat@...sung.com>
Subject: [PATCH 2/5] fat: restructure export operations
From: Namjae Jeon <namjae.jeon@...sung.com>
Define two nfs export_operation structures,one for 'stale_rw' mounts and
the other for 'nostale_ro'.The former uses the generic
export_encode_fh function to encode file handle, while the latter uses
fat_encode_fh.
Since inode number is not needed for nostale_ro, remove it from struct
fat_fid and repack other needed info viz. i_pos and i_generation.
Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Ravishankar N <ravi.n1@...sung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
---
fs/fat/fat.h | 2 +
fs/fat/inode.c | 12 ++----
fs/fat/nfs.c | 127 +++++++++++++++++++++++++++++++++++++++++++-------------
3 files changed, 104 insertions(+), 37 deletions(-)
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index febc1cca..65f9149 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -391,6 +391,8 @@ void fat_cache_destroy(void);
/* fat/nfs.c */
struct fid;
+extern const struct export_operations fat_export_ops;
+extern const struct export_operations fat_export_ops_nostale;
extern int fat_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
struct inode *parent);
extern struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fid,
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 80c6fdd..34253dc 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -18,7 +18,6 @@
#include <linux/pagemap.h>
#include <linux/mpage.h>
#include <linux/buffer_head.h>
-#include <linux/exportfs.h>
#include <linux/mount.h>
#include <linux/vfs.h>
#include <linux/parser.h>
@@ -703,13 +702,6 @@ static const struct super_operations fat_sops = {
.show_options = fat_show_options,
};
-static const struct export_operations fat_export_ops = {
- .encode_fh = fat_encode_fh,
- .fh_to_dentry = fat_fh_to_dentry,
- .fh_to_parent = fat_fh_to_parent,
- .get_parent = fat_get_parent,
-};
-
static int fat_show_options(struct seq_file *m, struct dentry *root)
{
struct msdos_sb_info *sbi = MSDOS_SB(root->d_sb);
@@ -1118,8 +1110,10 @@ out:
opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH);
if (opts->unicode_xlate)
opts->utf8 = 0;
- if (opts->nfs == FAT_NFS_NOSTALE_RO)
+ if (opts->nfs == FAT_NFS_NOSTALE_RO) {
sb->s_flags |= MS_RDONLY;
+ sb->s_export_op = &fat_export_ops_nostale;
+ }
return 0;
}
diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
index 671a75d..0abfacf 100644
--- a/fs/fat/nfs.c
+++ b/fs/fat/nfs.c
@@ -15,13 +15,17 @@
#include "fat.h"
struct fat_fid {
- u32 ino;
- u32 gen;
- u64 i_pos;
- u32 parent_ino;
- u32 parent_gen;
+ u32 i_gen;
+ u32 i_pos_low;
+ u16 i_pos_hi;
+ u16 parent_i_pos_hi;
+ u32 parent_i_pos_low;
+ u32 parent_i_gen;
} __packed;
+#define FILEID_FAT_WITHOUT_PARENT (offsetof(struct fat_fid, parent_i_pos_hi)/4)
+#define FILEID_FAT_WITH_PARENT (sizeof(struct fat_fid)/4)
+
/**
* Look up a directory inode given its starting cluster.
*/
@@ -47,15 +51,24 @@ static struct inode *fat_dget(struct super_block *sb, int i_logstart)
return inode;
}
+static struct inode *fat_ilookup(struct super_block *sb, u64 ino, loff_t i_pos)
+{
+ if (MSDOS_SB(sb)->options.nfs == FAT_NFS_NOSTALE_RO)
+ return fat_iget(sb, i_pos);
+
+ else {
+ if ((ino < MSDOS_ROOT_INO) || (ino == MSDOS_FSINFO_INO))
+ return NULL;
+ return ilookup(sb, ino);
+ }
+}
+
static struct inode *fat_nfs_get_inode(struct super_block *sb,
u64 ino, u32 generation, loff_t i_pos)
{
- struct inode *inode;
- if ((ino < MSDOS_ROOT_INO) || (ino == MSDOS_FSINFO_INO))
- return NULL;
+ struct inode *inode = fat_ilookup(sb, ino, i_pos);
- inode = ilookup(sb, ino);
if (inode && generation && (inode->i_generation != generation)) {
iput(inode);
inode = NULL;
@@ -89,7 +102,8 @@ static struct inode *fat_nfs_get_inode(struct super_block *sb,
int
-fat_encode_fh(struct inode *inode, __u32 *fh, int *lenp, struct inode *parent)
+fat_encode_fh_nostale(struct inode *inode, __u32 *fh, int *lenp,
+ struct inode *parent)
{
int len = *lenp;
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
@@ -97,24 +111,26 @@ fat_encode_fh(struct inode *inode, __u32 *fh, int *lenp, struct inode *parent)
loff_t i_pos;
int type = FILEID_INO32_GEN;
- if (parent && (len < 5)) {
- *lenp = 5;
+ if (parent && (len < FILEID_FAT_WITH_PARENT)) {
+ *lenp = FILEID_FAT_WITH_PARENT;
return 255;
- } else if (len < 3) {
- *lenp = 3;
+ } else if (len < FILEID_FAT_WITHOUT_PARENT) {
+ *lenp = FILEID_FAT_WITHOUT_PARENT;
return 255;
}
i_pos = fat_i_pos_read(sbi, inode);
- *lenp = 3;
- fid->ino = inode->i_ino;
- fid->gen = inode->i_generation;
- fid->i_pos = i_pos;
+ *lenp = FILEID_FAT_WITHOUT_PARENT;
+ fid->i_gen = inode->i_generation;
+ fid->i_pos_low = i_pos & 0xFFFFFFFF;
+ fid->i_pos_hi = (i_pos >> 32) & 0xFF;
if (parent) {
- fid->parent_ino = parent->i_ino;
- fid->parent_gen = parent->i_generation;
+ i_pos = fat_i_pos_read(sbi, parent);
+ fid->parent_i_pos_hi = (i_pos >> 32) & 0xFF;
+ fid->parent_i_pos_low = i_pos & 0xFFFFFFFF;
+ fid->parent_i_gen = parent->i_generation;
type = FILEID_INO32_GEN_PARENT;
- *lenp = 5;
+ *lenp = FILEID_FAT_WITH_PARENT;
}
return type;
@@ -128,14 +144,36 @@ struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
struct inode *inode = NULL;
- struct fat_fid *fid = (struct fat_fid *)fh;
- if (fh_len < 3)
+ if (fh_len < 2)
return NULL;
switch (fh_type) {
case FILEID_INO32_GEN:
case FILEID_INO32_GEN_PARENT:
- inode = fat_nfs_get_inode(sb, fid->ino, fid->gen, fid->i_pos);
+ inode = fat_nfs_get_inode(sb, fh->i32.ino, fh->i32.gen, 0);
+ break;
+ }
+
+ return d_obtain_alias(inode);
+}
+struct dentry *fat_fh_to_dentry_nostale(struct super_block *sb, struct fid *fh,
+ int fh_len, int fh_type)
+{
+ struct inode *inode = NULL;
+ struct fat_fid *fid = (struct fat_fid *)fh;
+ loff_t i_pos;
+
+ switch (fh_type) {
+ case FILEID_INO32_GEN:
+ if (fh_len < FILEID_FAT_WITHOUT_PARENT)
+ return NULL;
+ case FILEID_INO32_GEN_PARENT:
+ if ((fh_len < FILEID_FAT_WITH_PARENT) &&
+ (fh_type == FILEID_INO32_GEN_PARENT))
+ return NULL;
+ i_pos = fid->i_pos_hi;
+ i_pos = (i_pos << 32) | (fid->i_pos_low);
+ inode = fat_nfs_get_inode(sb, 0, fid->i_gen, i_pos);
break;
}
@@ -147,18 +185,39 @@ struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fh,
* Find the parent for a file specified by NFS handle.
* This requires that the handle contain the i_ino of the parent.
*/
-struct dentry *fat_fh_to_parent(struct super_block *sb, struct fid *fh,
+struct dentry *fat_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ struct inode *inode = NULL;
+
+ if (fh_len < 2)
+ return NULL;
+
+ switch (fh_type) {
+ case FILEID_INO32_GEN:
+ case FILEID_INO32_GEN_PARENT:
+ inode = fat_nfs_get_inode(sb, fid->i32.ino, fid->i32.gen, 0);
+ break;
+ }
+
+ return d_obtain_alias(inode);
+}
+
+struct dentry *fat_fh_to_parent_nostale(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
struct inode *inode = NULL;
struct fat_fid *fid = (struct fat_fid *)fh;
- if (fh_len < 5)
+ loff_t i_pos;
+
+ if (fh_len < FILEID_FAT_WITH_PARENT)
return NULL;
switch (fh_type) {
case FILEID_INO32_GEN_PARENT:
- inode = fat_nfs_get_inode(sb, fid->parent_ino, fid->parent_gen,
- fid->i_pos);
+ i_pos = fid->parent_i_pos_hi;
+ i_pos = (i_pos << 32) | (fid->parent_i_pos_low);
+ inode = fat_nfs_get_inode(sb, 0, fid->parent_i_gen, i_pos);
break;
}
@@ -303,3 +362,15 @@ out:
return d_obtain_alias(parent_inode);
}
+
+const struct export_operations fat_export_ops = {
+ .fh_to_dentry = fat_fh_to_dentry,
+ .fh_to_parent = fat_fh_to_parent,
+ .get_parent = fat_get_parent,
+};
+const struct export_operations fat_export_ops_nostale = {
+ .encode_fh = fat_encode_fh_nostale,
+ .fh_to_dentry = fat_fh_to_dentry_nostale,
+ .fh_to_parent = fat_fh_to_parent_nostale,
+ .get_parent = fat_get_parent,
+};
--
1.7.9.5
--
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