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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-07 21:28:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-07 21:28:04 -0700
commita9fbcd6728837268784439ad0b02ede2c024c516 (patch)
tree2a58af9a6f7573617ab482aea0998389d8b956af /fs/ext4
parent5abe37954e9a315c35c9490f78d55f307c3c636b (diff)
parent2c58d548f5706d085c4b009f6abb945220460632 (diff)
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Merge tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
Pull fscrypt updates from Ted Ts'o: "Clean up fscrypt's dcache revalidation support, and other miscellaneous cleanups" * tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt: fscrypt: cache decrypted symlink target in ->i_link vfs: use READ_ONCE() to access ->i_link fscrypt: fix race where ->lookup() marks plaintext dentry as ciphertext fscrypt: only set dentry_operations on ciphertext dentries fs, fscrypt: clear DCACHE_ENCRYPTED_NAME when unaliasing directory fscrypt: fix race allowing rename() and link() of ciphertext dentries fscrypt: clean up and improve dentry revalidation fscrypt: use READ_ONCE() to access ->i_crypt_info fscrypt: remove WARN_ON_ONCE() when decryption fails fscrypt: drop inode argument from fscrypt_get_ctx()
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ext4.h62
-rw-r--r--fs/ext4/namei.c76
-rw-r--r--fs/ext4/readpage.c2
-rw-r--r--fs/ext4/super.c1
4 files changed, 101 insertions, 40 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ef755e5f6f2f..1cb67859e051 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2303,23 +2303,47 @@ extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
#ifdef CONFIG_FS_ENCRYPTION
+static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
+ const struct fscrypt_name *src)
+{
+ memset(dst, 0, sizeof(*dst));
+
+ dst->usr_fname = src->usr_fname;
+ dst->disk_name = src->disk_name;
+ dst->hinfo.hash = src->hash;
+ dst->hinfo.minor_hash = src->minor_hash;
+ dst->crypto_buf = src->crypto_buf;
+}
+
static inline int ext4_fname_setup_filename(struct inode *dir,
- const struct qstr *iname,
- int lookup, struct ext4_filename *fname)
+ const struct qstr *iname,
+ int lookup,
+ struct ext4_filename *fname)
{
struct fscrypt_name name;
int err;
- memset(fname, 0, sizeof(struct ext4_filename));
-
err = fscrypt_setup_filename(dir, iname, lookup, &name);
+ if (err)
+ return err;
- fname->usr_fname = name.usr_fname;
- fname->disk_name = name.disk_name;
- fname->hinfo.hash = name.hash;
- fname->hinfo.minor_hash = name.minor_hash;
- fname->crypto_buf = name.crypto_buf;
- return err;
+ ext4_fname_from_fscrypt_name(fname, &name);
+ return 0;
+}
+
+static inline int ext4_fname_prepare_lookup(struct inode *dir,
+ struct dentry *dentry,
+ struct ext4_filename *fname)
+{
+ struct fscrypt_name name;
+ int err;
+
+ err = fscrypt_prepare_lookup(dir, dentry, &name);
+ if (err)
+ return err;
+
+ ext4_fname_from_fscrypt_name(fname, &name);
+ return 0;
}
static inline void ext4_fname_free_filename(struct ext4_filename *fname)
@@ -2333,19 +2357,27 @@ static inline void ext4_fname_free_filename(struct ext4_filename *fname)
fname->usr_fname = NULL;
fname->disk_name.name = NULL;
}
-#else
+#else /* !CONFIG_FS_ENCRYPTION */
static inline int ext4_fname_setup_filename(struct inode *dir,
- const struct qstr *iname,
- int lookup, struct ext4_filename *fname)
+ const struct qstr *iname,
+ int lookup,
+ struct ext4_filename *fname)
{
fname->usr_fname = iname;
fname->disk_name.name = (unsigned char *) iname->name;
fname->disk_name.len = iname->len;
return 0;
}
-static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
-#endif
+static inline int ext4_fname_prepare_lookup(struct inode *dir,
+ struct dentry *dentry,
+ struct ext4_filename *fname)
+{
+ return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
+}
+
+static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
+#endif /* !CONFIG_FS_ENCRYPTION */
/* dir.c */
extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index e917830eae84..6d50f53b7a15 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1371,7 +1371,7 @@ static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
}
/*
- * ext4_find_entry()
+ * __ext4_find_entry()
*
* finds an entry in the specified directory with the wanted name. It
* returns the cache buffer in which the entry was found, and the entry
@@ -1381,39 +1381,32 @@ static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
* The returned buffer_head has ->b_count elevated. The caller is expected
* to brelse() it when appropriate.
*/
-static struct buffer_head * ext4_find_entry (struct inode *dir,
- const struct qstr *d_name,
- struct ext4_dir_entry_2 **res_dir,
- int *inlined)
+static struct buffer_head *__ext4_find_entry(struct inode *dir,
+ struct ext4_filename *fname,
+ struct ext4_dir_entry_2 **res_dir,
+ int *inlined)
{
struct super_block *sb;
struct buffer_head *bh_use[NAMEI_RA_SIZE];
struct buffer_head *bh, *ret = NULL;
ext4_lblk_t start, block;
- const u8 *name = d_name->name;
+ const u8 *name = fname->usr_fname->name;
size_t ra_max = 0; /* Number of bh's in the readahead
buffer, bh_use[] */
size_t ra_ptr = 0; /* Current index into readahead
buffer */
ext4_lblk_t nblocks;
int i, namelen, retval;
- struct ext4_filename fname;
*res_dir = NULL;
sb = dir->i_sb;
- namelen = d_name->len;
+ namelen = fname->usr_fname->len;
if (namelen > EXT4_NAME_LEN)
return NULL;
- retval = ext4_fname_setup_filename(dir, d_name, 1, &fname);
- if (retval == -ENOENT)
- return NULL;
- if (retval)
- return ERR_PTR(retval);
-
if (ext4_has_inline_data(dir)) {
int has_inline_data = 1;
- ret = ext4_find_inline_entry(dir, &fname, res_dir,
+ ret = ext4_find_inline_entry(dir, fname, res_dir,
&has_inline_data);
if (has_inline_data) {
if (inlined)
@@ -1433,7 +1426,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
goto restart;
}
if (is_dx(dir)) {
- ret = ext4_dx_find_entry(dir, &fname, res_dir);
+ ret = ext4_dx_find_entry(dir, fname, res_dir);
/*
* On success, or if the error was file not found,
* return. Otherwise, fall back to doing a search the
@@ -1497,7 +1490,7 @@ restart:
goto cleanup_and_exit;
}
set_buffer_verified(bh);
- i = search_dirblock(bh, dir, &fname,
+ i = search_dirblock(bh, dir, fname,
block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
if (i == 1) {
EXT4_I(dir)->i_dir_start_lookup = block;
@@ -1528,10 +1521,50 @@ cleanup_and_exit:
/* Clean up the read-ahead blocks */
for (; ra_ptr < ra_max; ra_ptr++)
brelse(bh_use[ra_ptr]);
- ext4_fname_free_filename(&fname);
return ret;
}
+static struct buffer_head *ext4_find_entry(struct inode *dir,
+ const struct qstr *d_name,
+ struct ext4_dir_entry_2 **res_dir,
+ int *inlined)
+{
+ int err;
+ struct ext4_filename fname;
+ struct buffer_head *bh;
+
+ err = ext4_fname_setup_filename(dir, d_name, 1, &fname);
+ if (err == -ENOENT)
+ return NULL;
+ if (err)
+ return ERR_PTR(err);
+
+ bh = __ext4_find_entry(dir, &fname, res_dir, inlined);
+
+ ext4_fname_free_filename(&fname);
+ return bh;
+}
+
+static struct buffer_head *ext4_lookup_entry(struct inode *dir,
+ struct dentry *dentry,
+ struct ext4_dir_entry_2 **res_dir)
+{
+ int err;
+ struct ext4_filename fname;
+ struct buffer_head *bh;
+
+ err = ext4_fname_prepare_lookup(dir, dentry, &fname);
+ if (err == -ENOENT)
+ return NULL;
+ if (err)
+ return ERR_PTR(err);
+
+ bh = __ext4_find_entry(dir, &fname, res_dir, NULL);
+
+ ext4_fname_free_filename(&fname);
+ return bh;
+}
+
static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **res_dir)
@@ -1590,16 +1623,11 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
struct inode *inode;
struct ext4_dir_entry_2 *de;
struct buffer_head *bh;
- int err;
-
- err = fscrypt_prepare_lookup(dir, dentry, flags);
- if (err)
- return ERR_PTR(err);
if (dentry->d_name.len > EXT4_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
- bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
+ bh = ext4_lookup_entry(dir, dentry, &de);
if (IS_ERR(bh))
return ERR_CAST(bh);
inode = NULL;
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 2a39c7cb1441..c916017db334 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -244,7 +244,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
struct fscrypt_ctx *ctx = NULL;
if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode)) {
- ctx = fscrypt_get_ctx(inode, GFP_NOFS);
+ ctx = fscrypt_get_ctx(GFP_NOFS);
if (IS_ERR(ctx))
goto set_error_page;
}
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3681cb737e9d..f71b5254a990 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1113,6 +1113,7 @@ static int ext4_drop_inode(struct inode *inode)
static void ext4_free_in_core_inode(struct inode *inode)
{
+ fscrypt_free_inode(inode);
kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}