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-rw-r--r--fs/fat/Makefile2
-rw-r--r--fs/fat/cache.c10
-rw-r--r--fs/fat/dir.c60
-rw-r--r--fs/fat/fat.h98
-rw-r--r--fs/fat/fatent.c13
-rw-r--r--fs/fat/file.c6
-rw-r--r--fs/fat/inode.c215
-rw-r--r--fs/fat/namei_msdos.c33
-rw-r--r--fs/fat/namei_vfat.c35
-rw-r--r--fs/fat/nfs.c101
10 files changed, 313 insertions, 260 deletions
diff --git a/fs/fat/Makefile b/fs/fat/Makefile
index e06190322c1c..964b634f6667 100644
--- a/fs/fat/Makefile
+++ b/fs/fat/Makefile
@@ -6,6 +6,6 @@ obj-$(CONFIG_FAT_FS) += fat.o
obj-$(CONFIG_VFAT_FS) += vfat.o
obj-$(CONFIG_MSDOS_FS) += msdos.o
-fat-y := cache.o dir.o fatent.o file.o inode.o misc.o
+fat-y := cache.o dir.o fatent.o file.o inode.o misc.o nfs.o
vfat-y := namei_vfat.o
msdos-y := namei_msdos.o
diff --git a/fs/fat/cache.c b/fs/fat/cache.c
index 1cc7038e273d..91ad9e1c9441 100644
--- a/fs/fat/cache.c
+++ b/fs/fat/cache.c
@@ -190,7 +190,8 @@ static void __fat_cache_inval_inode(struct inode *inode)
struct fat_cache *cache;
while (!list_empty(&i->cache_lru)) {
- cache = list_entry(i->cache_lru.next, struct fat_cache, cache_list);
+ cache = list_entry(i->cache_lru.next,
+ struct fat_cache, cache_list);
list_del_init(&cache->cache_list);
i->nr_caches--;
fat_cache_free(cache);
@@ -261,9 +262,10 @@ int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus)
if (nr < 0)
goto out;
else if (nr == FAT_ENT_FREE) {
- fat_fs_error_ratelimit(sb, "%s: invalid cluster chain"
- " (i_pos %lld)", __func__,
- MSDOS_I(inode)->i_pos);
+ fat_fs_error_ratelimit(sb,
+ "%s: invalid cluster chain (i_pos %lld)",
+ __func__,
+ MSDOS_I(inode)->i_pos);
nr = -EIO;
goto out;
} else if (nr == FAT_ENT_EOF) {
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index dc49ed2cbffa..2a182342442e 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -18,7 +18,7 @@
#include <linux/time.h>
#include <linux/buffer_head.h>
#include <linux/compat.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
#include <linux/kernel.h>
#include "fat.h"
@@ -123,7 +123,8 @@ static inline int fat_get_entry(struct inode *dir, loff_t *pos,
{
/* Fast stuff first */
if (*bh && *de &&
- (*de - (struct msdos_dir_entry *)(*bh)->b_data) < MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
+ (*de - (struct msdos_dir_entry *)(*bh)->b_data) <
+ MSDOS_SB(dir->i_sb)->dir_per_block - 1) {
*pos += sizeof(struct msdos_dir_entry);
(*de)++;
return 0;
@@ -155,7 +156,8 @@ static int uni16_to_x8(struct super_block *sb, unsigned char *ascii,
while (*ip && ((len - NLS_MAX_CHARSET_SIZE) > 0)) {
ec = *ip++;
- if ((charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE)) > 0) {
+ charlen = nls->uni2char(ec, op, NLS_MAX_CHARSET_SIZE);
+ if (charlen > 0) {
op += charlen;
len -= charlen;
} else {
@@ -172,12 +174,12 @@ static int uni16_to_x8(struct super_block *sb, unsigned char *ascii,
}
if (unlikely(*ip)) {
- fat_msg(sb, KERN_WARNING, "filename was truncated while "
- "converting.");
+ fat_msg(sb, KERN_WARNING,
+ "filename was truncated while converting.");
}
*op = 0;
- return (op - ascii);
+ return op - ascii;
}
static inline int fat_uni_to_x8(struct super_block *sb, const wchar_t *uni,
@@ -205,7 +207,8 @@ fat_short2uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
}
static inline int
-fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *uni)
+fat_short2lower_uni(struct nls_table *t, unsigned char *c,
+ int clen, wchar_t *uni)
{
int charlen;
wchar_t wc;
@@ -220,7 +223,8 @@ fat_short2lower_uni(struct nls_table *t, unsigned char *c, int clen, wchar_t *un
if (!nc)
nc = *c;
- if ( (charlen = t->char2uni(&nc, 1, uni)) < 0) {
+ charlen = t->char2uni(&nc, 1, uni);
+ if (charlen < 0) {
*uni = 0x003f; /* a question mark */
charlen = 1;
}
@@ -537,7 +541,6 @@ end_of_dir:
return err;
}
-
EXPORT_SYMBOL_GPL(fat_search_long);
struct fat_ioctl_filldir_callback {
@@ -568,13 +571,14 @@ static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent,
int short_len = 0, fill_len = 0;
int ret = 0;
- lock_super(sb);
+ mutex_lock(&sbi->s_lock);
cpos = filp->f_pos;
/* Fake . and .. for the root directory. */
if (inode->i_ino == MSDOS_ROOT_INO) {
while (cpos < 2) {
- if (filldir(dirent, "..", cpos+1, cpos, MSDOS_ROOT_INO, DT_DIR) < 0)
+ if (filldir(dirent, "..", cpos+1, cpos,
+ MSDOS_ROOT_INO, DT_DIR) < 0)
goto out;
cpos++;
filp->f_pos++;
@@ -689,7 +693,7 @@ fill_failed:
if (unicode)
__putname(unicode);
out:
- unlock_super(sb);
+ mutex_unlock(&sbi->s_lock);
return ret;
}
@@ -872,25 +876,26 @@ static int fat_get_short_entry(struct inode *dir, loff_t *pos,
}
/*
- * The ".." entry can not provide the "struct fat_slot_info" informations
- * for inode. So, this function provide the some informations only.
+ * The ".." entry can not provide the "struct fat_slot_info" information
+ * for inode, nor a usable i_pos. So, this function provides some information
+ * only.
+ *
+ * Since this function walks through the on-disk inodes within a directory,
+ * callers are responsible for taking any locks necessary to prevent the
+ * directory from changing.
*/
int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
- struct msdos_dir_entry **de, loff_t *i_pos)
+ struct msdos_dir_entry **de)
{
- loff_t offset;
+ loff_t offset = 0;
- offset = 0;
- *bh = NULL;
+ *de = NULL;
while (fat_get_short_entry(dir, &offset, bh, de) >= 0) {
- if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME)) {
- *i_pos = fat_make_i_pos(dir->i_sb, *bh, *de);
+ if (!strncmp((*de)->name, MSDOS_DOTDOT, MSDOS_NAME))
return 0;
- }
}
return -ENOENT;
}
-
EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
/* See if directory is empty */
@@ -913,7 +918,6 @@ int fat_dir_empty(struct inode *dir)
brelse(bh);
return result;
}
-
EXPORT_SYMBOL_GPL(fat_dir_empty);
/*
@@ -959,7 +963,6 @@ int fat_scan(struct inode *dir, const unsigned char *name,
}
return -ENOENT;
}
-
EXPORT_SYMBOL_GPL(fat_scan);
static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
@@ -1047,7 +1050,6 @@ int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
return 0;
}
-
EXPORT_SYMBOL_GPL(fat_remove_entries);
static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
@@ -1141,10 +1143,8 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
de[0].ctime_cs = de[1].ctime_cs = 0;
de[0].adate = de[0].cdate = de[1].adate = de[1].cdate = 0;
}
- de[0].start = cpu_to_le16(cluster);
- de[0].starthi = cpu_to_le16(cluster >> 16);
- de[1].start = cpu_to_le16(MSDOS_I(dir)->i_logstart);
- de[1].starthi = cpu_to_le16(MSDOS_I(dir)->i_logstart >> 16);
+ fat_set_start(&de[0], cluster);
+ fat_set_start(&de[1], MSDOS_I(dir)->i_logstart);
de[0].size = de[1].size = 0;
memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
set_buffer_uptodate(bhs[0]);
@@ -1161,7 +1161,6 @@ error_free:
error:
return err;
}
-
EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
@@ -1377,5 +1376,4 @@ error_remove:
__fat_remove_entries(dir, pos, free_slots);
return err;
}
-
EXPORT_SYMBOL_GPL(fat_add_entries);
diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index 2deeeb86f331..623f36f0423b 100644
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -5,6 +5,7 @@
#include <linux/string.h>
#include <linux/nls.h>
#include <linux/fs.h>
+#include <linux/hash.h>
#include <linux/mutex.h>
#include <linux/ratelimit.h>
#include <linux/msdos_fs.h>
@@ -23,30 +24,31 @@
#define FAT_ERRORS_RO 3 /* remount r/o on error */
struct fat_mount_options {
- uid_t fs_uid;
- gid_t fs_gid;
+ kuid_t fs_uid;
+ kgid_t fs_gid;
unsigned short fs_fmask;
unsigned short fs_dmask;
- unsigned short codepage; /* Codepage for shortname conversions */
- char *iocharset; /* Charset used for filename input/display */
- unsigned short shortname; /* flags for shortname display/create rule */
- unsigned char name_check; /* r = relaxed, n = normal, s = strict */
- unsigned char errors; /* On error: continue, panic, remount-ro */
+ unsigned short codepage; /* Codepage for shortname conversions */
+ char *iocharset; /* Charset used for filename input/display */
+ unsigned short shortname; /* flags for shortname display/create rule */
+ unsigned char name_check; /* r = relaxed, n = normal, s = strict */
+ unsigned char errors; /* On error: continue, panic, remount-ro */
unsigned short allow_utime;/* permission for setting the [am]time */
- unsigned quiet:1, /* set = fake successful chmods and chowns */
- showexec:1, /* set = only set x bit for com/exe/bat */
- sys_immutable:1, /* set = system files are immutable */
- dotsOK:1, /* set = hidden and system files are named '.filename' */
- isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
- utf8:1, /* Use of UTF-8 character set (Default) */
- unicode_xlate:1, /* create escape sequences for unhandled Unicode */
- numtail:1, /* Does first alias have a numeric '~1' type tail? */
- flush:1, /* write things quickly */
- nocase:1, /* Does this need case conversion? 0=need case conversion*/
- usefree:1, /* Use free_clusters for FAT32 */
- tz_utc:1, /* Filesystem timestamps are in UTC */
- rodir:1, /* allow ATTR_RO for directory */
- discard:1; /* Issue discard requests on deletions */
+ unsigned quiet:1, /* set = fake successful chmods and chowns */
+ showexec:1, /* set = only set x bit for com/exe/bat */
+ sys_immutable:1, /* set = system files are immutable */
+ dotsOK:1, /* set = hidden and system files are named '.filename' */
+ isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
+ utf8:1, /* Use of UTF-8 character set (Default) */
+ unicode_xlate:1, /* create escape sequences for unhandled Unicode */
+ numtail:1, /* Does first alias have a numeric '~1' type tail? */
+ flush:1, /* write things quickly */
+ nocase:1, /* Does this need case conversion? 0=need case conversion*/
+ usefree:1, /* Use free_clusters for FAT32 */
+ tz_utc:1, /* Filesystem timestamps are in UTC */
+ rodir:1, /* allow ATTR_RO for directory */
+ discard:1, /* Issue discard requests on deletions */
+ nfs:1; /* Do extra work needed for NFS export */
};
#define FAT_HASH_BITS 8
@@ -56,28 +58,29 @@ struct fat_mount_options {
* MS-DOS file system in-core superblock data
*/
struct msdos_sb_info {
- unsigned short sec_per_clus; /* sectors/cluster */
- unsigned short cluster_bits; /* log2(cluster_size) */
- unsigned int cluster_size; /* cluster size */
- unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
+ unsigned short sec_per_clus; /* sectors/cluster */
+ unsigned short cluster_bits; /* log2(cluster_size) */
+ unsigned int cluster_size; /* cluster size */
+ unsigned char fats, fat_bits; /* number of FATs, FAT bits (12 or 16) */
unsigned short fat_start;
- unsigned long fat_length; /* FAT start & length (sec.) */
+ unsigned long fat_length; /* FAT start & length (sec.) */
unsigned long dir_start;
- unsigned short dir_entries; /* root dir start & entries */
- unsigned long data_start; /* first data sector */
- unsigned long max_cluster; /* maximum cluster number */
- unsigned long root_cluster; /* first cluster of the root directory */
- unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
+ unsigned short dir_entries; /* root dir start & entries */
+ unsigned long data_start; /* first data sector */
+ unsigned long max_cluster; /* maximum cluster number */
+ unsigned long root_cluster; /* first cluster of the root directory */
+ unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
struct mutex fat_lock;
+ struct mutex s_lock;
unsigned int prev_free; /* previously allocated cluster number */
unsigned int free_clusters; /* -1 if undefined */
unsigned int free_clus_valid; /* is free_clusters valid? */
struct fat_mount_options options;
- struct nls_table *nls_disk; /* Codepage used on disk */
- struct nls_table *nls_io; /* Charset used for input and display */
- const void *dir_ops; /* Opaque; default directory operations */
- int dir_per_block; /* dir entries per block */
- int dir_per_block_bits; /* log2(dir_per_block) */
+ struct nls_table *nls_disk; /* Codepage used on disk */
+ struct nls_table *nls_io; /* Charset used for input and display */
+ const void *dir_ops; /* Opaque; default directory operations */
+ int dir_per_block; /* dir entries per block */
+ int dir_per_block_bits; /* log2(dir_per_block) */
int fatent_shift;
struct fatent_operations *fatent_ops;
@@ -88,6 +91,9 @@ struct msdos_sb_info {
spinlock_t inode_hash_lock;
struct hlist_head inode_hashtable[FAT_HASH_SIZE];
+
+ spinlock_t dir_hash_lock;
+ struct hlist_head dir_hashtable[FAT_HASH_SIZE];
};
#define FAT_CACHE_VALID 0 /* special case for valid cache */
@@ -110,6 +116,7 @@ struct msdos_inode_info {
int i_attrs; /* unused attribute bits */
loff_t i_pos; /* on-disk position of directory entry or 0 */
struct hlist_node i_fat_hash; /* hash by i_location */
+ struct hlist_node i_dir_hash; /* hash by i_logstart */
struct rw_semaphore truncate_lock; /* protect bmap against truncate */
struct inode vfs_inode;
};
@@ -262,7 +269,7 @@ extern int fat_subdirs(struct inode *dir);
extern int fat_scan(struct inode *dir, const unsigned char *name,
struct fat_slot_info *sinfo);
extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
- struct msdos_dir_entry **de, loff_t *i_pos);
+ struct msdos_dir_entry **de);
extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
struct fat_slot_info *sinfo);
@@ -322,7 +329,7 @@ extern long fat_generic_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg);
extern const struct file_operations fat_file_operations;
extern const struct inode_operations fat_file_inode_operations;
-extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
+extern int fat_setattr(struct dentry *dentry, struct iattr *attr);
extern void fat_truncate_blocks(struct inode *inode, loff_t offset);
extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
@@ -340,7 +347,12 @@ extern int fat_fill_super(struct super_block *sb, void *data, int silent,
int isvfat, void (*setup)(struct super_block *));
extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
- struct inode *i2);
+ struct inode *i2);
+static inline unsigned long fat_dir_hash(int logstart)
+{
+ return hash_32(logstart, FAT_HASH_BITS);
+}
+
/* fat/misc.c */
extern __printf(3, 4) __cold
void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...);
@@ -366,6 +378,14 @@ extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
int fat_cache_init(void);
void fat_cache_destroy(void);
+/* fat/nfs.c */
+struct fid;
+extern struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type);
+extern struct dentry *fat_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type);
+extern struct dentry *fat_get_parent(struct dentry *child_dir);
+
/* helper for printk */
typedef unsigned long long llu;
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 31f08ab62c56..260705c58062 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -186,9 +186,6 @@ static void fat16_ent_put(struct fat_entry *fatent, int new)
static void fat32_ent_put(struct fat_entry *fatent, int new)
{
- if (new == FAT_ENT_EOF)
- new = EOF_FAT32;
-
WARN_ON(new & 0xf0000000);
new |= le32_to_cpu(*fatent->u.ent32_p) & ~0x0fffffff;
*fatent->u.ent32_p = cpu_to_le32(new);
@@ -203,15 +200,18 @@ static int fat12_ent_next(struct fat_entry *fatent)
fatent->entry++;
if (fatent->nr_bhs == 1) {
- WARN_ON(ent12_p[0] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 2)));
- WARN_ON(ent12_p[1] > (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
+ WARN_ON(ent12_p[0] > (u8 *)(bhs[0]->b_data +
+ (bhs[0]->b_size - 2)));
+ WARN_ON(ent12_p[1] > (u8 *)(bhs[0]->b_data +
+ (bhs[0]->b_size - 1)));
if (nextp < (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1))) {
ent12_p[0] = nextp - 1;
ent12_p[1] = nextp;
return 1;
}
} else {
- WARN_ON(ent12_p[0] != (u8 *)(bhs[0]->b_data + (bhs[0]->b_size - 1)));
+ WARN_ON(ent12_p[0] != (u8 *)(bhs[0]->b_data +
+ (bhs[0]->b_size - 1)));
WARN_ON(ent12_p[1] != (u8 *)bhs[1]->b_data);
ent12_p[0] = nextp - 1;
ent12_p[1] = nextp;
@@ -631,7 +631,6 @@ error:
return err;
}
-
EXPORT_SYMBOL_GPL(fat_free_clusters);
/* 128kb is the whole sectors for FAT12 and FAT16 */
diff --git a/fs/fat/file.c b/fs/fat/file.c
index e007b8bd8e5e..a62e0ecbe2db 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -352,7 +352,7 @@ static int fat_allow_set_time(struct msdos_sb_info *sbi, struct inode *inode)
{
umode_t allow_utime = sbi->options.allow_utime;
- if (current_fsuid() != inode->i_uid) {
+ if (!uid_eq(current_fsuid(), inode->i_uid)) {
if (in_group_p(inode->i_gid))
allow_utime >>= 3;
if (allow_utime & MAY_WRITE)
@@ -407,9 +407,9 @@ int fat_setattr(struct dentry *dentry, struct iattr *attr)
}
if (((attr->ia_valid & ATTR_UID) &&
- (attr->ia_uid != sbi->options.fs_uid)) ||
+ (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) ||
((attr->ia_valid & ATTR_GID) &&
- (attr->ia_gid != sbi->options.fs_gid)) ||
+ (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) ||
((attr->ia_valid & ATTR_MODE) &&
(attr->ia_mode & ~FAT_VALID_MODE)))
error = -EPERM;
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 05e897fe9866..5bafaad00530 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -281,15 +281,42 @@ static inline unsigned long fat_hash(loff_t i_pos)
return hash_32(i_pos, FAT_HASH_BITS);
}
+static void dir_hash_init(struct super_block *sb)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ int i;
+
+ spin_lock_init(&sbi->dir_hash_lock);
+ for (i = 0; i < FAT_HASH_SIZE; i++)
+ INIT_HLIST_HEAD(&sbi->dir_hashtable[i]);
+}
+
void fat_attach(struct inode *inode, loff_t i_pos)
{
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
- struct hlist_head *head = sbi->inode_hashtable + fat_hash(i_pos);
- spin_lock(&sbi->inode_hash_lock);
- MSDOS_I(inode)->i_pos = i_pos;
- hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head);
- spin_unlock(&sbi->inode_hash_lock);
+ if (inode->i_ino != MSDOS_ROOT_INO) {
+ struct hlist_head *head = sbi->inode_hashtable
+ + fat_hash(i_pos);
+
+ spin_lock(&sbi->inode_hash_lock);
+ MSDOS_I(inode)->i_pos = i_pos;
+ hlist_add_head(&MSDOS_I(inode)->i_fat_hash, head);
+ spin_unlock(&sbi->inode_hash_lock);
+ }
+
+ /* If NFS support is enabled, cache the mapping of start cluster
+ * to directory inode. This is used during reconnection of
+ * dentries to the filesystem root.
+ */
+ if (S_ISDIR(inode->i_mode) && sbi->options.nfs) {
+ struct hlist_head *d_head = sbi->dir_hashtable;
+ d_head += fat_dir_hash(MSDOS_I(inode)->i_logstart);
+
+ spin_lock(&sbi->dir_hash_lock);
+ hlist_add_head(&MSDOS_I(inode)->i_dir_hash, d_head);
+ spin_unlock(&sbi->dir_hash_lock);
+ }
}
EXPORT_SYMBOL_GPL(fat_attach);
@@ -300,6 +327,12 @@ void fat_detach(struct inode *inode)
MSDOS_I(inode)->i_pos = 0;
hlist_del_init(&MSDOS_I(inode)->i_fat_hash);
spin_unlock(&sbi->inode_hash_lock);
+
+ if (S_ISDIR(inode->i_mode) && sbi->options.nfs) {
+ spin_lock(&sbi->dir_hash_lock);
+ hlist_del_init(&MSDOS_I(inode)->i_dir_hash);
+ spin_unlock(&sbi->dir_hash_lock);
+ }
}
EXPORT_SYMBOL_GPL(fat_detach);
@@ -504,6 +537,7 @@ static void init_once(void *foo)
ei->cache_valid_id = FAT_CACHE_VALID + 1;
INIT_LIST_HEAD(&ei->cache_lru);
INIT_HLIST_NODE(&ei->i_fat_hash);
+ INIT_HLIST_NODE(&ei->i_dir_hash);
inode_init_once(&ei->vfs_inode);
}
@@ -521,6 +555,11 @@ static int __init fat_init_inodecache(void)
static void __exit fat_destroy_inodecache(void)
{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
kmem_cache_destroy(fat_inode_cachep);
}
@@ -634,9 +673,9 @@ static int fat_write_inode(struct inode *inode, struct writeback_control *wbc)
if (inode->i_ino == MSDOS_FSINFO_INO) {
struct super_block *sb = inode->i_sb;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = fat_clusters_flush(sb);
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
} else
err = __fat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
@@ -663,125 +702,9 @@ static const struct super_operations fat_sops = {
.show_options = fat_show_options,
};
-/*
- * a FAT file handle with fhtype 3 is
- * 0/ i_ino - for fast, reliable lookup if still in the cache
- * 1/ i_generation - to see if i_ino is still valid
- * bit 0 == 0 iff directory
- * 2/ i_pos(8-39) - if ino has changed, but still in cache
- * 3/ i_pos(4-7)|i_logstart - to semi-verify inode found at i_pos
- * 4/ i_pos(0-3)|parent->i_logstart - maybe used to hunt for the file on disc
- *
- * Hack for NFSv2: Maximum FAT entry number is 28bits and maximum
- * i_pos is 40bits (blocknr(32) + dir offset(8)), so two 4bits
- * of i_logstart is used to store the directory entry offset.
- */
-
-static struct dentry *fat_fh_to_dentry(struct super_block *sb,
- struct fid *fid, int fh_len, int fh_type)
-{
- struct inode *inode = NULL;
- u32 *fh = fid->raw;
-
- if (fh_len < 5 || fh_type != 3)
- return NULL;
-
- inode = ilookup(sb, fh[0]);
- if (!inode || inode->i_generation != fh[1]) {
- if (inode)
- iput(inode);
- inode = NULL;
- }
- if (!inode) {
- loff_t i_pos;
- int i_logstart = fh[3] & 0x0fffffff;
-
- i_pos = (loff_t)fh[2] << 8;
- i_pos |= ((fh[3] >> 24) & 0xf0) | (fh[4] >> 28);
-
- /* try 2 - see if i_pos is in F-d-c
- * require i_logstart to be the same
- * Will fail if you truncate and then re-write
- */
-
- inode = fat_iget(sb, i_pos);
- if (inode && MSDOS_I(inode)->i_logstart != i_logstart) {
- iput(inode);
- inode = NULL;
- }
- }
-
- /*
- * For now, do nothing if the inode is not found.
- *
- * What we could do is:
- *
- * - follow the file starting at fh[4], and record the ".." entry,
- * and the name of the fh[2] entry.
- * - then follow the ".." file finding the next step up.
- *
- * This way we build a path to the root of the tree. If this works, we
- * lookup the path and so get this inode into the cache. Finally try
- * the fat_iget lookup again. If that fails, then we are totally out
- * of luck. But all that is for another day
- */
- return d_obtain_alias(inode);
-}
-
-static int
-fat_encode_fh(struct inode *inode, __u32 *fh, int *lenp, struct inode *parent)
-{
- int len = *lenp;
- struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
- loff_t i_pos;
-
- if (len < 5) {
- *lenp = 5;
- return 255; /* no room */
- }
-
- i_pos = fat_i_pos_read(sbi, inode);
- *lenp = 5;
- fh[0] = inode->i_ino;
- fh[1] = inode->i_generation;
- fh[2] = i_pos >> 8;
- fh[3] = ((i_pos & 0xf0) << 24) | MSDOS_I(inode)->i_logstart;
- fh[4] = (i_pos & 0x0f) << 28;
- if (parent)
- fh[4] |= MSDOS_I(parent)->i_logstart;
- return 3;
-}
-
-static struct dentry *fat_get_parent(struct dentry *child)
-{
- struct super_block *sb = child->d_sb;
- struct buffer_head *bh;
- struct msdos_dir_entry *de;
- loff_t i_pos;
- struct dentry *parent;
- struct inode *inode;
- int err;
-
- lock_super(sb);
-
- err = fat_get_dotdot_entry(child->d_inode, &bh, &de, &i_pos);
- if (err) {
- parent = ERR_PTR(err);
- goto out;
- }
- inode = fat_build_inode(sb, de, i_pos);
- brelse(bh);
-
- parent = d_obtain_alias(inode);
-out:
- unlock_super(sb);
-
- return parent;
-}
-
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,
};
@@ -791,10 +714,12 @@ static int fat_show_options(struct seq_file *m, struct dentry *root)
struct fat_mount_options *opts = &sbi->options;
int isvfat = opts->isvfat;
- if (opts->fs_uid != 0)
- seq_printf(m, ",uid=%u", opts->fs_uid);
- if (opts->fs_gid != 0)
- seq_printf(m, ",gid=%u", opts->fs_gid);
+ if (!uid_eq(opts->fs_uid, GLOBAL_ROOT_UID))
+ seq_printf(m, ",uid=%u",
+ from_kuid_munged(&init_user_ns, opts->fs_uid));
+ if (!gid_eq(opts->fs_gid, GLOBAL_ROOT_GID))
+ seq_printf(m, ",gid=%u",
+ from_kgid_munged(&init_user_ns, opts->fs_gid));
seq_printf(m, ",fmask=%04o", opts->fs_fmask);
seq_printf(m, ",dmask=%04o", opts->fs_dmask);
if (opts->allow_utime)
@@ -829,6 +754,8 @@ static int fat_show_options(struct seq_file *m, struct dentry *root)
seq_puts(m, ",usefree");
if (opts->quiet)
seq_puts(m, ",quiet");
+ if (opts->nfs)
+ seq_puts(m, ",nfs");
if (opts->showexec)
seq_puts(m, ",showexec");
if (opts->sys_immutable)
@@ -873,7 +800,7 @@ enum {
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
Opt_obsolete, Opt_flush, Opt_tz_utc, Opt_rodir, Opt_err_cont,
- Opt_err_panic, Opt_err_ro, Opt_discard, Opt_err,
+ Opt_err_panic, Opt_err_ro, Opt_discard, Opt_nfs, Opt_err,
};
static const match_table_t fat_tokens = {
@@ -902,6 +829,7 @@ static const match_table_t fat_tokens = {
{Opt_err_panic, "errors=panic"},
{Opt_err_ro, "errors=remount-ro"},
{Opt_discard, "discard"},
+ {Opt_nfs, "nfs"},
{Opt_obsolete, "conv=binary"},
{Opt_obsolete, "conv=text"},
{Opt_obsolete, "conv=auto"},
@@ -982,6 +910,7 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat,
opts->numtail = 1;
opts->usefree = opts->nocase = 0;
opts->tz_utc = 0;
+ opts->nfs = 0;
opts->errors = FAT_ERRORS_RO;
*debug = 0;
@@ -1037,12 +966,16 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat,
case Opt_uid:
if (match_int(&args[0], &option))
return 0;
- opts->fs_uid = option;
+ opts->fs_uid = make_kuid(current_user_ns(), option);
+ if (!uid_valid(opts->fs_uid))
+ return 0;
break;
case Opt_gid:
if (match_int(&args[0], &option))
return 0;
- opts->fs_gid = option;
+ opts->fs_gid = make_kgid(current_user_ns(), option);
+ if (!gid_valid(opts->fs_gid))
+ return 0;
break;
case Opt_umask:
if (match_octal(&args[0], &option))
@@ -1142,6 +1075,9 @@ static int parse_options(struct super_block *sb, char *options, int is_vfat,
case Opt_discard:
opts->discard = 1;
break;
+ case Opt_nfs:
+ opts->nfs = 1;
+ break;
/* obsolete mount options */
case Opt_obsolete:
@@ -1332,6 +1268,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
b = (struct fat_boot_sector *) bh->b_data;
}
+ mutex_init(&sbi->s_lock);
sbi->cluster_size = sb->s_blocksize * sbi->sec_per_clus;
sbi->cluster_bits = ffs(sbi->cluster_size) - 1;
sbi->fats = b->fats;
@@ -1432,6 +1369,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
/* set up enough so that it can read an inode */
fat_hash_init(sb);
+ dir_hash_init(sb);
fat_ent_access_init(sb);
/*
@@ -1486,6 +1424,7 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat,
}
error = -ENOMEM;
insert_inode_hash(root_inode);
+ fat_attach(root_inode, 0);
sb->s_root = d_make_root(root_inode);
if (!sb->s_root) {
fat_msg(sb, KERN_ERR, "get root inode failed");
@@ -1525,18 +1464,14 @@ static int writeback_inode(struct inode *inode)
{
int ret;
- struct address_space *mapping = inode->i_mapping;
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_NONE,
- .nr_to_write = 0,
- };
- /* if we used WB_SYNC_ALL, sync_inode waits for the io for the
- * inode to finish. So WB_SYNC_NONE is sent down to sync_inode
+
+ /* if we used wait=1, sync_inode_metadata waits for the io for the
+ * inode to finish. So wait=0 is sent down to sync_inode_metadata
* and filemap_fdatawrite is used for the data blocks
*/
- ret = sync_inode(inode, &wbc);
+ ret = sync_inode_metadata(inode, 0);
if (!ret)
- ret = filemap_fdatawrite(mapping);
+ ret = filemap_fdatawrite(inode->i_mapping);
return ret;
}
diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index b0e12bf9f4a1..e2cfda94a28d 100644
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -208,7 +208,7 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
struct inode *inode;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
switch (err) {
case -ENOENT:
@@ -221,7 +221,7 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
default:
inode = ERR_PTR(err);
}
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return d_splice_alias(inode, dentry);
}
@@ -273,7 +273,7 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
unsigned char msdos_name[MSDOS_NAME];
int err, is_hid;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
msdos_name, &MSDOS_SB(sb)->options);
@@ -302,7 +302,7 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, umode_t mode,
d_instantiate(dentry, inode);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
if (!err)
err = fat_flush_inodes(sb, dir, inode);
return err;
@@ -316,7 +316,7 @@ static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
struct fat_slot_info sinfo;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
/*
* Check whether the directory is not in use, then check
* whether it is empty.
@@ -337,7 +337,7 @@ static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
inode->i_ctime = CURRENT_TIME_SEC;
fat_detach(inode);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
if (!err)
err = fat_flush_inodes(sb, dir, inode);
@@ -354,7 +354,7 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
struct timespec ts;
int err, is_hid, cluster;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
msdos_name, &MSDOS_SB(sb)->options);
@@ -392,14 +392,14 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
d_instantiate(dentry, inode);
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
fat_flush_inodes(sb, dir, inode);
return 0;
out_free:
fat_free_clusters(dir, cluster);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
}
@@ -407,11 +407,11 @@ out:
static int msdos_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
- struct super_block *sb= inode->i_sb;
+ struct super_block *sb = inode->i_sb;
struct fat_slot_info sinfo;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
if (err)
goto out;
@@ -423,7 +423,7 @@ static int msdos_unlink(struct inode *dir, struct dentry *dentry)
inode->i_ctime = CURRENT_TIME_SEC;
fat_detach(inode);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
if (!err)
err = fat_flush_inodes(sb, dir, inode);
@@ -440,7 +440,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
struct inode *old_inode, *new_inode;
struct fat_slot_info old_sinfo, sinfo;
struct timespec ts;
- loff_t dotdot_i_pos, new_i_pos;
+ loff_t new_i_pos;
int err, old_attrs, is_dir, update_dotdot, corrupt = 0;
old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
@@ -456,8 +456,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
is_dir = S_ISDIR(old_inode->i_mode);
update_dotdot = (is_dir && old_dir != new_dir);
if (update_dotdot) {
- if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
- &dotdot_i_pos) < 0) {
+ if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
err = -EIO;
goto out;
}
@@ -607,7 +606,7 @@ static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
int err, is_hid;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = msdos_format_name(old_dentry->d_name.name,
old_dentry->d_name.len, old_msdos_name,
@@ -626,7 +625,7 @@ static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
new_dir, new_msdos_name, new_dentry, is_hid);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
if (!err)
err = fat_flush_inodes(sb, old_dir, new_dir);
return err;
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index 6a6d8c0715a1..ac959d655e7d 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -721,7 +721,7 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
struct dentry *alias;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = vfat_find(dir, &dentry->d_name, &sinfo);
if (err) {
@@ -752,13 +752,13 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
if (!S_ISDIR(inode->i_mode))
d_move(alias, dentry);
iput(inode);
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return alias;
} else
dput(alias);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
dentry->d_time = dentry->d_parent->d_inode->i_version;
dentry = d_splice_alias(inode, dentry);
if (dentry)
@@ -766,7 +766,7 @@ out:
return dentry;
error:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return ERR_PTR(err);
}
@@ -779,7 +779,7 @@ static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
struct timespec ts;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
ts = CURRENT_TIME_SEC;
err = vfat_add_entry(dir, &dentry->d_name, 0, 0, &ts, &sinfo);
@@ -800,7 +800,7 @@ static int vfat_create(struct inode *dir, struct dentry *dentry, umode_t mode,
dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry, inode);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
}
@@ -811,7 +811,7 @@ static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
struct fat_slot_info sinfo;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = fat_dir_empty(inode);
if (err)
@@ -829,7 +829,7 @@ static int vfat_rmdir(struct inode *dir, struct dentry *dentry)
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
fat_detach(inode);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
}
@@ -841,7 +841,7 @@ static int vfat_unlink(struct inode *dir, struct dentry *dentry)
struct fat_slot_info sinfo;
int err;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = vfat_find(dir, &dentry->d_name, &sinfo);
if (err)
@@ -854,7 +854,7 @@ static int vfat_unlink(struct inode *dir, struct dentry *dentry)
inode->i_mtime = inode->i_atime = CURRENT_TIME_SEC;
fat_detach(inode);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
}
@@ -867,7 +867,7 @@ static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
struct timespec ts;
int err, cluster;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
ts = CURRENT_TIME_SEC;
cluster = fat_alloc_new_dir(dir, &ts);
@@ -896,13 +896,13 @@ static int vfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
dentry->d_time = dentry->d_parent->d_inode->i_version;
d_instantiate(dentry, inode);
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return 0;
out_free:
fat_free_clusters(dir, cluster);
out:
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
}
@@ -914,14 +914,14 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *old_inode, *new_inode;
struct fat_slot_info old_sinfo, sinfo;
struct timespec ts;
- loff_t dotdot_i_pos, new_i_pos;
+ loff_t new_i_pos;
int err, is_dir, update_dotdot, corrupt = 0;
struct super_block *sb = old_dir->i_sb;
old_sinfo.bh = sinfo.bh = dotdot_bh = NULL;
old_inode = old_dentry->d_inode;
new_inode = new_dentry->d_inode;
- lock_super(sb);
+ mutex_lock(&MSDOS_SB(sb)->s_lock);
err = vfat_find(old_dir, &old_dentry->d_name, &old_sinfo);
if (err)
goto out;
@@ -929,8 +929,7 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
is_dir = S_ISDIR(old_inode->i_mode);
update_dotdot = (is_dir && old_dir != new_dir);
if (update_dotdot) {
- if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de,
- &dotdot_i_pos) < 0) {
+ if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) {
err = -EIO;
goto out;
}
@@ -997,7 +996,7 @@ out:
brelse(sinfo.bh);
brelse(dotdot_bh);
brelse(old_sinfo.bh);
- unlock_super(sb);
+ mutex_unlock(&MSDOS_SB(sb)->s_lock);
return err;
diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
new file mode 100644
index 000000000000..ef4b5faba87b
--- /dev/null
+++ b/fs/fat/nfs.c
@@ -0,0 +1,101 @@
+/* fs/fat/nfs.c
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/exportfs.h>
+#include "fat.h"
+
+/**
+ * Look up a directory inode given its starting cluster.
+ */
+static struct inode *fat_dget(struct super_block *sb, int i_logstart)
+{
+ struct msdos_sb_info *sbi = MSDOS_SB(sb);
+ struct hlist_head *head;
+ struct hlist_node *_p;
+ struct msdos_inode_info *i;
+ struct inode *inode = NULL;
+
+ head = sbi->dir_hashtable + fat_dir_hash(i_logstart);
+ spin_lock(&sbi->dir_hash_lock);
+ hlist_for_each_entry(i, _p, head, i_dir_hash) {
+ BUG_ON(i->vfs_inode.i_sb != sb);
+ if (i->i_logstart != i_logstart)
+ continue;
+ inode = igrab(&i->vfs_inode);
+ if (inode)
+ break;
+ }
+ spin_unlock(&sbi->dir_hash_lock);
+ return inode;
+}
+
+static struct inode *fat_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ if ((ino < MSDOS_ROOT_INO) || (ino == MSDOS_FSINFO_INO))
+ return NULL;
+
+ inode = ilookup(sb, ino);
+ if (inode && generation && (inode->i_generation != generation)) {
+ iput(inode);
+ inode = NULL;
+ }
+
+ return inode;
+}
+
+/**
+ * Map a NFS file handle to a corresponding dentry.
+ * The dentry may or may not be connected to the filesystem root.
+ */
+struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ fat_nfs_get_inode);
+}
+
+/*
+ * 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 *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ fat_nfs_get_inode);
+}
+
+/*
+ * Find the parent for a directory that is not currently connected to
+ * the filesystem root.
+ *
+ * On entry, the caller holds child_dir->d_inode->i_mutex.
+ */
+struct dentry *fat_get_parent(struct dentry *child_dir)
+{
+ struct super_block *sb = child_dir->d_sb;
+ struct buffer_head *bh = NULL;
+ struct msdos_dir_entry *de;
+ struct inode *parent_inode = NULL;
+
+ if (!fat_get_dotdot_entry(child_dir->d_inode, &bh, &de)) {
+ int parent_logstart = fat_get_start(MSDOS_SB(sb), de);
+ parent_inode = fat_dget(sb, parent_logstart);
+ }
+ brelse(bh);
+
+ return d_obtain_alias(parent_inode);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 13:36:47 +0000