diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-11 00:14:12 +0400 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-11 06:54:35 +0400 |
commit | 26fe575028703948880fce4355a210c76bb0536e (patch) | |
tree | 0a7d04289e1eb1f1739659ebc9498d40f2add5da | |
parent | ee983e89670704b2a05e897b161f2674a42d1508 (diff) | |
download | linux-26fe575028703948880fce4355a210c76bb0536e.tar.xz |
vfs: make it possible to access the dentry hash/len as one 64-bit entry
This allows comparing hash and len in one operation on 64-bit
architectures. Right now only __d_lookup_rcu() takes advantage of this,
since that is the case we care most about.
The use of anonymous struct/unions hides the alternate 64-bit approach
from most users, the exception being a few cases where we initialize a
'struct qstr' with a static initializer. This makes the problematic
cases use a new QSTR_INIT() helper function for that (but initializing
just the name pointer with a "{ .name = xyzzy }" initializer remains
valid, as does just copying another qstr structure).
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | fs/dcache.c | 16 | ||||
-rw-r--r-- | fs/ext2/namei.c | 2 | ||||
-rw-r--r-- | fs/ext3/namei.c | 2 | ||||
-rw-r--r-- | fs/ext4/namei.c | 5 | ||||
-rw-r--r-- | fs/gfs2/dir.c | 2 | ||||
-rw-r--r-- | fs/libfs.c | 4 | ||||
-rw-r--r-- | fs/nfs/dir.c | 5 | ||||
-rw-r--r-- | fs/nfs/nfs3proc.c | 3 | ||||
-rw-r--r-- | fs/nfs/nfs4proc.c | 3 | ||||
-rw-r--r-- | fs/nfs/proc.c | 3 | ||||
-rw-r--r-- | fs/nilfs2/namei.c | 2 | ||||
-rw-r--r-- | fs/ubifs/tnc.c | 2 | ||||
-rw-r--r-- | fs/ubifs/xattr.c | 6 | ||||
-rw-r--r-- | fs/udf/namei.c | 2 | ||||
-rw-r--r-- | fs/ufs/super.c | 5 | ||||
-rw-r--r-- | include/linux/dcache.h | 19 | ||||
-rw-r--r-- | net/sunrpc/clnt.c | 4 | ||||
-rw-r--r-- | net/sunrpc/rpc_pipe.c | 7 |
18 files changed, 44 insertions, 48 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index e6707a1f72c6..92099f61bc64 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1502,7 +1502,7 @@ struct dentry *d_make_root(struct inode *root_inode) struct dentry *res = NULL; if (root_inode) { - static const struct qstr name = { .name = "/", .len = 1 }; + static const struct qstr name = QSTR_INIT("/", 1); res = __d_alloc(root_inode->i_sb, &name); if (res) @@ -1816,10 +1816,9 @@ struct dentry *__d_lookup_rcu(const struct dentry *parent, const struct qstr *name, unsigned *seqp, struct inode *inode) { - unsigned int len = name->len; - unsigned int hash = name->hash; + u64 hashlen = name->hash_len; const unsigned char *str = name->name; - struct hlist_bl_head *b = d_hash(parent, hash); + struct hlist_bl_head *b = d_hash(parent, hashlen_hash(hashlen)); struct hlist_bl_node *node; struct dentry *dentry; @@ -1846,9 +1845,6 @@ struct dentry *__d_lookup_rcu(const struct dentry *parent, hlist_bl_for_each_entry_rcu(dentry, node, b, d_hash) { unsigned seq; - if (dentry->d_name.hash != hash) - continue; - seqretry: /* * The dentry sequence count protects us from concurrent @@ -1871,6 +1867,8 @@ seqretry: *seqp = seq; if (unlikely(parent->d_flags & DCACHE_OP_COMPARE)) { + if (dentry->d_name.hash != hashlen_hash(hashlen)) + continue; switch (slow_dentry_cmp(parent, inode, dentry, seq, name)) { case D_COMP_OK: return dentry; @@ -1881,9 +1879,9 @@ seqretry: } } - if (dentry->d_name.len != len) + if (dentry->d_name.hash_len != hashlen) continue; - if (!dentry_cmp(dentry, str, len)) + if (!dentry_cmp(dentry, str, hashlen_len(hashlen))) return dentry; } return NULL; diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c index dffb86536285..f663a67d7bf0 100644 --- a/fs/ext2/namei.c +++ b/fs/ext2/namei.c @@ -79,7 +79,7 @@ static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, str struct dentry *ext2_get_parent(struct dentry *child) { - struct qstr dotdot = {.name = "..", .len = 2}; + struct qstr dotdot = QSTR_INIT("..", 2); unsigned long ino = ext2_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c index d7940b24cf68..eeb63dfc5d20 100644 --- a/fs/ext3/namei.c +++ b/fs/ext3/namei.c @@ -1045,7 +1045,7 @@ static struct dentry *ext3_lookup(struct inode * dir, struct dentry *dentry, str struct dentry *ext3_get_parent(struct dentry *child) { unsigned long ino; - struct qstr dotdot = {.name = "..", .len = 2}; + struct qstr dotdot = QSTR_INIT("..", 2); struct ext3_dir_entry_2 * de; struct buffer_head *bh; diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 349d7b3671c8..e2a3f4b0ff78 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -1052,10 +1052,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, stru struct dentry *ext4_get_parent(struct dentry *child) { __u32 ino; - static const struct qstr dotdot = { - .name = "..", - .len = 2, - }; + static const struct qstr dotdot = QSTR_INIT("..", 2); struct ext4_dir_entry_2 * de; struct buffer_head *bh; diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c index a836056343f0..8aaeb07a07b5 100644 --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -821,7 +821,7 @@ static struct gfs2_leaf *new_leaf(struct inode *inode, struct buffer_head **pbh, struct buffer_head *bh; struct gfs2_leaf *leaf; struct gfs2_dirent *dent; - struct qstr name = { .name = "", .len = 0, .hash = 0 }; + struct qstr name = { .name = "" }; error = gfs2_alloc_blocks(ip, &bn, &n, 0, NULL); if (error) diff --git a/fs/libfs.c b/fs/libfs.c index 18d08f5db53a..f86ec27a4230 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -68,7 +68,7 @@ struct dentry *simple_lookup(struct inode *dir, struct dentry *dentry, struct na int dcache_dir_open(struct inode *inode, struct file *file) { - static struct qstr cursor_name = {.len = 1, .name = "."}; + static struct qstr cursor_name = QSTR_INIT(".", 1); file->private_data = d_alloc(file->f_path.dentry, &cursor_name); @@ -225,7 +225,7 @@ struct dentry *mount_pseudo(struct file_system_type *fs_type, char *name, struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL); struct dentry *dentry; struct inode *root; - struct qstr d_name = {.name = name, .len = strlen(name)}; + struct qstr d_name = QSTR_INIT(name, strlen(name)); if (IS_ERR(s)) return ERR_CAST(s); diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 8789210c6905..eedd24d0ad2e 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -477,10 +477,7 @@ different: static void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry) { - struct qstr filename = { - .len = entry->len, - .name = entry->name, - }; + struct qstr filename = QSTR_INIT(entry->name, entry->len); struct dentry *dentry; struct dentry *alias; struct inode *dir = parent->d_inode; diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c index 5242eae6711a..75c68299358e 100644 --- a/fs/nfs/nfs3proc.c +++ b/fs/nfs/nfs3proc.c @@ -398,8 +398,7 @@ nfs3_proc_remove(struct inode *dir, struct qstr *name) { struct nfs_removeargs arg = { .fh = NFS_FH(dir), - .name.len = name->len, - .name.name = name->name, + .name = *name, }; struct nfs_removeres res; struct rpc_message msg = { diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 99650aaf8937..ab985f6f0da8 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -2782,8 +2782,7 @@ static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) struct nfs_server *server = NFS_SERVER(dir); struct nfs_removeargs args = { .fh = NFS_FH(dir), - .name.len = name->len, - .name.name = name->name, + .name = *name, .bitmask = server->attr_bitmask, }; struct nfs_removeres res = { diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c index b63b6f4d14fb..d6408b6437de 100644 --- a/fs/nfs/proc.c +++ b/fs/nfs/proc.c @@ -335,8 +335,7 @@ nfs_proc_remove(struct inode *dir, struct qstr *name) { struct nfs_removeargs arg = { .fh = NFS_FH(dir), - .name.len = name->len, - .name.name = name->name, + .name = *name, }; struct rpc_message msg = { .rpc_proc = &nfs_procedures[NFSPROC_REMOVE], diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c index fce2bbee66d4..0bb2c2010b95 100644 --- a/fs/nilfs2/namei.c +++ b/fs/nilfs2/namei.c @@ -441,7 +441,7 @@ static struct dentry *nilfs_get_parent(struct dentry *child) { unsigned long ino; struct inode *inode; - struct qstr dotdot = {.name = "..", .len = 2}; + struct qstr dotdot = QSTR_INIT("..", 2); struct nilfs_root *root; ino = nilfs_inode_by_name(child->d_inode, &dotdot); diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c index 16ad84d8402f..abd51331345e 100644 --- a/fs/ubifs/tnc.c +++ b/fs/ubifs/tnc.c @@ -2361,7 +2361,7 @@ int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key, * by passing 'ubifs_tnc_remove_nm()' the same key but * an unmatchable name. */ - struct qstr noname = { .len = 0, .name = "" }; + struct qstr noname = { .name = "" }; err = dbg_check_tnc(c, 0); mutex_unlock(&c->tnc_mutex); diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c index 85b272268754..7a8bafa19c9f 100644 --- a/fs/ubifs/xattr.c +++ b/fs/ubifs/xattr.c @@ -298,7 +298,7 @@ int ubifs_setxattr(struct dentry *dentry, const char *name, { struct inode *inode, *host = dentry->d_inode; struct ubifs_info *c = host->i_sb->s_fs_info; - struct qstr nm = { .name = name, .len = strlen(name) }; + struct qstr nm = QSTR_INIT(name, strlen(name)); struct ubifs_dent_node *xent; union ubifs_key key; int err, type; @@ -361,7 +361,7 @@ ssize_t ubifs_getxattr(struct dentry *dentry, const char *name, void *buf, { struct inode *inode, *host = dentry->d_inode; struct ubifs_info *c = host->i_sb->s_fs_info; - struct qstr nm = { .name = name, .len = strlen(name) }; + struct qstr nm = QSTR_INIT(name, strlen(name)); struct ubifs_inode *ui; struct ubifs_dent_node *xent; union ubifs_key key; @@ -524,7 +524,7 @@ int ubifs_removexattr(struct dentry *dentry, const char *name) { struct inode *inode, *host = dentry->d_inode; struct ubifs_info *c = host->i_sb->s_fs_info; - struct qstr nm = { .name = name, .len = strlen(name) }; + struct qstr nm = QSTR_INIT(name, strlen(name)); struct ubifs_dent_node *xent; union ubifs_key key; int err; diff --git a/fs/udf/namei.c b/fs/udf/namei.c index 38de8f234b94..a165c66e3eef 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -1193,7 +1193,7 @@ static struct dentry *udf_get_parent(struct dentry *child) { struct kernel_lb_addr tloc; struct inode *inode = NULL; - struct qstr dotdot = {.name = "..", .len = 2}; + struct qstr dotdot = QSTR_INIT("..", 2); struct fileIdentDesc cfi; struct udf_fileident_bh fibh; diff --git a/fs/ufs/super.c b/fs/ufs/super.c index ac8e279eccc6..302f340d0071 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -146,10 +146,7 @@ static struct dentry *ufs_fh_to_parent(struct super_block *sb, struct fid *fid, static struct dentry *ufs_get_parent(struct dentry *child) { - struct qstr dot_dot = { - .name = "..", - .len = 2, - }; + struct qstr dot_dot = QSTR_INIT("..", 2); ino_t ino; ino = ufs_inode_by_name(child->d_inode, &dot_dot); diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 8239f64d1c2e..094789ff3e9f 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -25,6 +25,13 @@ struct vfsmount; #define IS_ROOT(x) ((x) == (x)->d_parent) +/* The hash is always the low bits of hash_len */ +#ifdef __LITTLE_ENDIAN + #define HASH_LEN_DECLARE u32 hash; u32 len; +#else + #define HASH_LEN_DECLARE u32 len; u32 hash; +#endif + /* * "quick string" -- eases parameter passing, but more importantly * saves "metadata" about the string (ie length and the hash). @@ -33,11 +40,19 @@ struct vfsmount; * dentry. */ struct qstr { - unsigned int hash; - unsigned int len; + union { + struct { + HASH_LEN_DECLARE; + }; + u64 hash_len; + }; const unsigned char *name; }; +#define QSTR_INIT(n,l) { { { .len = l } }, .name = n } +#define hashlen_hash(hashlen) ((u32) (hashlen)) +#define hashlen_len(hashlen) ((u32)((hashlen) >> 32)) + struct dentry_stat_t { int nr_dentry; int nr_unused; diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index adf2990acebf..7fee13b331d1 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -127,9 +127,7 @@ static struct dentry *rpc_setup_pipedir_sb(struct super_block *sb, { static uint32_t clntid; char name[15]; - struct qstr q = { - .name = name, - }; + struct qstr q = { .name = name }; struct dentry *dir, *dentry; int error; diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 3b62cf288031..fd2423991c2d 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -1059,12 +1059,9 @@ static const struct rpc_filelist files[] = { struct dentry *rpc_d_lookup_sb(const struct super_block *sb, const unsigned char *dir_name) { - struct qstr dir = { - .name = dir_name, - .len = strlen(dir_name), - .hash = full_name_hash(dir_name, strlen(dir_name)), - }; + struct qstr dir = QSTR_INIT(dir_name, strlen(dir_name)); + dir.hash = full_name_hash(dir.name, dir.len); return d_lookup(sb->s_root, &dir); } EXPORT_SYMBOL_GPL(rpc_d_lookup_sb); 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