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authorTheodore Ts'o <tytso@mit.edu>2010-10-27 23:44:47 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-10-27 23:44:47 -0400
commita107e5a3a473a2ea62bd5af24e11b84adf1486ff (patch)
treed36c2cb38d8be88d4d75cdebc354aa140aa0e470 /fs/ext4/namei.c
parente3e1288e86a07cdeb0aee5860a2dff111c6eff79 (diff)
parenta269029d0e2192046be4c07ed78a45022469ee4c (diff)
Merge branch 'next' into upstream-merge
Conflicts: fs/ext4/inode.c fs/ext4/mballoc.c include/trace/events/ext4.h
Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c63
1 files changed, 27 insertions, 36 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index bd39885b5998..92203b8a099f 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -856,6 +856,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
struct buffer_head *bh_use[NAMEI_RA_SIZE];
struct buffer_head *bh, *ret = NULL;
ext4_lblk_t start, block, b;
+ const u8 *name = d_name->name;
int ra_max = 0; /* Number of bh's in the readahead
buffer, bh_use[] */
int ra_ptr = 0; /* Current index into readahead
@@ -870,6 +871,16 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
namelen = d_name->len;
if (namelen > EXT4_NAME_LEN)
return NULL;
+ if ((namelen <= 2) && (name[0] == '.') &&
+ (name[1] == '.' || name[1] == '0')) {
+ /*
+ * "." or ".." will only be in the first block
+ * NFS may look up ".."; "." should be handled by the VFS
+ */
+ block = start = 0;
+ nblocks = 1;
+ goto restart;
+ }
if (is_dx(dir)) {
bh = ext4_dx_find_entry(dir, d_name, res_dir, &err);
/*
@@ -960,55 +971,35 @@ cleanup_and_exit:
static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name,
struct ext4_dir_entry_2 **res_dir, int *err)
{
- struct super_block * sb;
+ struct super_block * sb = dir->i_sb;
struct dx_hash_info hinfo;
- u32 hash;
struct dx_frame frames[2], *frame;
- struct ext4_dir_entry_2 *de, *top;
struct buffer_head *bh;
ext4_lblk_t block;
int retval;
- int namelen = d_name->len;
- const u8 *name = d_name->name;
- sb = dir->i_sb;
- /* NFS may look up ".." - look at dx_root directory block */
- if (namelen > 2 || name[0] != '.'||(name[1] != '.' && name[1] != '\0')){
- if (!(frame = dx_probe(d_name, dir, &hinfo, frames, err)))
- return NULL;
- } else {
- frame = frames;
- frame->bh = NULL; /* for dx_release() */
- frame->at = (struct dx_entry *)frames; /* hack for zero entry*/
- dx_set_block(frame->at, 0); /* dx_root block is 0 */
- }
- hash = hinfo.hash;
+ if (!(frame = dx_probe(d_name, dir, &hinfo, frames, err)))
+ return NULL;
do {
block = dx_get_block(frame->at);
- if (!(bh = ext4_bread (NULL,dir, block, 0, err)))
+ if (!(bh = ext4_bread(NULL, dir, block, 0, err)))
goto errout;
- de = (struct ext4_dir_entry_2 *) bh->b_data;
- top = (struct ext4_dir_entry_2 *) ((char *) de + sb->s_blocksize -
- EXT4_DIR_REC_LEN(0));
- for (; de < top; de = ext4_next_entry(de, sb->s_blocksize)) {
- int off = (block << EXT4_BLOCK_SIZE_BITS(sb))
- + ((char *) de - bh->b_data);
-
- if (!ext4_check_dir_entry(dir, de, bh, off)) {
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto errout;
- }
- if (ext4_match(namelen, name, de)) {
- *res_dir = de;
- dx_release(frames);
- return bh;
- }
+ retval = search_dirblock(bh, dir, d_name,
+ block << EXT4_BLOCK_SIZE_BITS(sb),
+ res_dir);
+ if (retval == 1) { /* Success! */
+ dx_release(frames);
+ return bh;
}
brelse(bh);
+ if (retval == -1) {
+ *err = ERR_BAD_DX_DIR;
+ goto errout;
+ }
+
/* Check to see if we should continue to search */
- retval = ext4_htree_next_block(dir, hash, frame,
+ retval = ext4_htree_next_block(dir, hinfo.hash, frame,
frames, NULL);
if (retval < 0) {
ext4_warning(sb,