The patch titled
Subject: fat: add mutex lock to fat_build_inode
has been added to the -mm tree. Its filename is
fat-add-mutex-lock-to-fat_build_inode.patch
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------------------------------------------------------
From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Subject: fat: add mutex lock to fat_build_inode
fat_nfs_get_inode() does not hold i_mutex of parent directory. So add
lock to fat_build_inode().
Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Ravishankar N <ravi.n1@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
Cc: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fat/fat.h | 1 +
fs/fat/inode.c | 15 +++++++++++++++
2 files changed, 16 insertions(+)
diff -puN fs/fat/fat.h~fat-add-mutex-lock-to-fat_build_inode fs/fat/fat.h
--- a/fs/fat/fat.h~fat-add-mutex-lock-to-fat_build_inode
+++ a/fs/fat/fat.h
@@ -75,6 +75,7 @@ struct msdos_sb_info {
unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
struct mutex fat_lock;
struct mutex s_lock;
+ struct mutex nfs_build_inode_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? */
diff -puN fs/fat/inode.c~fat-add-mutex-lock-to-fat_build_inode fs/fat/inode.c
--- a/fs/fat/inode.c~fat-add-mutex-lock-to-fat_build_inode
+++ a/fs/fat/inode.c
@@ -443,12 +443,25 @@ static int fat_fill_inode(struct inode *
return 0;
}
+static inline void fat_lock_build_inode(struct msdos_sb_info *sbi)
+{
+ if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
+ mutex_lock(&sbi->nfs_build_inode_lock);
+}
+
+static inline void fat_unlock_build_inode(struct msdos_sb_info *sbi)
+{
+ if (sbi->options.nfs == FAT_NFS_NOSTALE_RO)
+ mutex_unlock(&sbi->nfs_build_inode_lock);
+}
+
struct inode *fat_build_inode(struct super_block *sb,
struct msdos_dir_entry *de, loff_t i_pos)
{
struct inode *inode;
int err;
+ fat_lock_build_inode(MSDOS_SB(sb));
inode = fat_iget(sb, i_pos);
if (inode)
goto out;
@@ -468,6 +481,7 @@ struct inode *fat_build_inode(struct sup
fat_attach(inode, i_pos);
insert_inode_hash(inode);
out:
+ fat_unlock_build_inode(MSDOS_SB(sb));
return inode;
}
@@ -1173,6 +1187,7 @@ int fat_fill_super(struct super_block *s
sb->s_magic = MSDOS_SUPER_MAGIC;
sb->s_op = &fat_sops;
sb->s_export_op = &fat_export_ops;
+ mutex_init(&sbi->nfs_build_inode_lock);
ratelimit_state_init(&sbi->ratelimit, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
_
Patches currently in -mm which might be from namjae.jeon@xxxxxxxxxxx are
fat-modify-nfs-mount-option.patch
fat-exportfs-rebuild-inode-if-ilookup-fails.patch
fat-exportfs-rebuild-inode-if-ilookup-fails-fix.patch
fat-exportfs-rebuild-directory-inode-if-fat_dget-fails.patch
documentation-update-nfs-option-in-filesystem-vfattxt.patch
fat-remove-parent_logstart-check-in-fat_get_parent.patch
fat-restructure-export-operations.patch
fat-move-fat_i_pos_read-to-fath.patch
fat-exportfs-move-code-to-rebuild-directory-inode-to-separate-function.patch
fat-add-mutex-lock-to-fat_build_inode.patch
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