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-rw-r--r--fs/ocfs2/dir.c1423
1 files changed, 1278 insertions, 145 deletions
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 0d5fdde959c..7453b70c1a1 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -55,10 +55,16 @@
#include "journal.h"
#include "namei.h"
#include "suballoc.h"
+#include "super.h"
#include "uptodate.h"
#include "buffer_head_io.h"
+#define NAMEI_RA_CHUNKS 2
+#define NAMEI_RA_BLOCKS 4
+#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
+#define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b))
+
static unsigned char ocfs2_filetype_table[] = {
DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
};
@@ -66,12 +72,614 @@ static unsigned char ocfs2_filetype_table[] = {
static int ocfs2_extend_dir(struct ocfs2_super *osb,
struct inode *dir,
struct buffer_head *parent_fe_bh,
+ unsigned int blocks_wanted,
struct buffer_head **new_de_bh);
+static int ocfs2_do_extend_dir(struct super_block *sb,
+ handle_t *handle,
+ struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ struct buffer_head **new_bh);
+
/*
- * ocfs2_readdir()
+ * bh passed here can be an inode block or a dir data block, depending
+ * on the inode inline data flag.
+ */
+static int ocfs2_check_dir_entry(struct inode * dir,
+ struct ocfs2_dir_entry * de,
+ struct buffer_head * bh,
+ unsigned long offset)
+{
+ const char *error_msg = NULL;
+ const int rlen = le16_to_cpu(de->rec_len);
+
+ if (rlen < OCFS2_DIR_REC_LEN(1))
+ error_msg = "rec_len is smaller than minimal";
+ else if (rlen % 4 != 0)
+ error_msg = "rec_len % 4 != 0";
+ else if (rlen < OCFS2_DIR_REC_LEN(de->name_len))
+ error_msg = "rec_len is too small for name_len";
+ else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize)
+ error_msg = "directory entry across blocks";
+
+ if (error_msg != NULL)
+ mlog(ML_ERROR, "bad entry in directory #%llu: %s - "
+ "offset=%lu, inode=%llu, rec_len=%d, name_len=%d\n",
+ (unsigned long long)OCFS2_I(dir)->ip_blkno, error_msg,
+ offset, (unsigned long long)le64_to_cpu(de->inode), rlen,
+ de->name_len);
+ return error_msg == NULL ? 1 : 0;
+}
+
+static inline int ocfs2_match(int len,
+ const char * const name,
+ struct ocfs2_dir_entry *de)
+{
+ if (len != de->name_len)
+ return 0;
+ if (!de->inode)
+ return 0;
+ return !memcmp(name, de->name, len);
+}
+
+/*
+ * Returns 0 if not found, -1 on failure, and 1 on success
+ */
+static int inline ocfs2_search_dirblock(struct buffer_head *bh,
+ struct inode *dir,
+ const char *name, int namelen,
+ unsigned long offset,
+ char *first_de,
+ unsigned int bytes,
+ struct ocfs2_dir_entry **res_dir)
+{
+ struct ocfs2_dir_entry *de;
+ char *dlimit, *de_buf;
+ int de_len;
+ int ret = 0;
+
+ mlog_entry_void();
+
+ de_buf = first_de;
+ dlimit = de_buf + bytes;
+
+ while (de_buf < dlimit) {
+ /* this code is executed quadratically often */
+ /* do minimal checking `by hand' */
+
+ de = (struct ocfs2_dir_entry *) de_buf;
+
+ if (de_buf + namelen <= dlimit &&
+ ocfs2_match(namelen, name, de)) {
+ /* found a match - just to be sure, do a full check */
+ if (!ocfs2_check_dir_entry(dir, de, bh, offset)) {
+ ret = -1;
+ goto bail;
+ }
+ *res_dir = de;
+ ret = 1;
+ goto bail;
+ }
+
+ /* prevent looping on a bad block */
+ de_len = le16_to_cpu(de->rec_len);
+ if (de_len <= 0) {
+ ret = -1;
+ goto bail;
+ }
+
+ de_buf += de_len;
+ offset += de_len;
+ }
+
+bail:
+ mlog_exit(ret);
+ return ret;
+}
+
+static struct buffer_head *ocfs2_find_entry_id(const char *name,
+ int namelen,
+ struct inode *dir,
+ struct ocfs2_dir_entry **res_dir)
+{
+ int ret, found;
+ struct buffer_head *di_bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_inline_data *data;
+
+ ret = ocfs2_read_block(OCFS2_SB(dir->i_sb), OCFS2_I(dir)->ip_blkno,
+ &di_bh, OCFS2_BH_CACHED, dir);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ di = (struct ocfs2_dinode *)di_bh->b_data;
+ data = &di->id2.i_data;
+
+ found = ocfs2_search_dirblock(di_bh, dir, name, namelen, 0,
+ data->id_data, i_size_read(dir), res_dir);
+ if (found == 1)
+ return di_bh;
+
+ brelse(di_bh);
+out:
+ return NULL;
+}
+
+struct buffer_head *ocfs2_find_entry_el(const char *name, int namelen,
+ struct inode *dir,
+ struct ocfs2_dir_entry **res_dir)
+{
+ struct super_block *sb;
+ struct buffer_head *bh_use[NAMEI_RA_SIZE];
+ struct buffer_head *bh, *ret = NULL;
+ unsigned long start, block, b;
+ int ra_max = 0; /* Number of bh's in the readahead
+ buffer, bh_use[] */
+ int ra_ptr = 0; /* Current index into readahead
+ buffer */
+ int num = 0;
+ int nblocks, i, err;
+
+ mlog_entry_void();
+
+ sb = dir->i_sb;
+
+ nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
+ start = OCFS2_I(dir)->ip_dir_start_lookup;
+ if (start >= nblocks)
+ start = 0;
+ block = start;
+
+restart:
+ do {
+ /*
+ * We deal with the read-ahead logic here.
+ */
+ if (ra_ptr >= ra_max) {
+ /* Refill the readahead buffer */
+ ra_ptr = 0;
+ b = block;
+ for (ra_max = 0; ra_max < NAMEI_RA_SIZE; ra_max++) {
+ /*
+ * Terminate if we reach the end of the
+ * directory and must wrap, or if our
+ * search has finished at this block.
+ */
+ if (b >= nblocks || (num && block == start)) {
+ bh_use[ra_max] = NULL;
+ break;
+ }
+ num++;
+
+ bh = ocfs2_bread(dir, b++, &err, 1);
+ bh_use[ra_max] = bh;
+ }
+ }
+ if ((bh = bh_use[ra_ptr++]) == NULL)
+ goto next;
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(bh)) {
+ /* read error, skip block & hope for the best */
+ ocfs2_error(dir->i_sb, "reading directory %llu, "
+ "offset %lu\n",
+ (unsigned long long)OCFS2_I(dir)->ip_blkno,
+ block);
+ brelse(bh);
+ goto next;
+ }
+ i = ocfs2_search_dirblock(bh, dir, name, namelen,
+ block << sb->s_blocksize_bits,
+ bh->b_data, sb->s_blocksize,
+ res_dir);
+ if (i == 1) {
+ OCFS2_I(dir)->ip_dir_start_lookup = block;
+ ret = bh;
+ goto cleanup_and_exit;
+ } else {
+ brelse(bh);
+ if (i < 0)
+ goto cleanup_and_exit;
+ }
+ next:
+ if (++block >= nblocks)
+ block = 0;
+ } while (block != start);
+
+ /*
+ * If the directory has grown while we were searching, then
+ * search the last part of the directory before giving up.
+ */
+ block = nblocks;
+ nblocks = i_size_read(dir) >> sb->s_blocksize_bits;
+ if (block < nblocks) {
+ start = 0;
+ goto restart;
+ }
+
+cleanup_and_exit:
+ /* Clean up the read-ahead blocks */
+ for (; ra_ptr < ra_max; ra_ptr++)
+ brelse(bh_use[ra_ptr]);
+
+ mlog_exit_ptr(ret);
+ return ret;
+}
+
+/*
+ * Try to find an entry of the provided name within 'dir'.
*
+ * If nothing was found, NULL is returned. Otherwise, a buffer_head
+ * and pointer to the dir entry are passed back.
+ *
+ * Caller can NOT assume anything about the contents of the
+ * buffer_head - it is passed back only so that it can be passed into
+ * any one of the manipulation functions (add entry, delete entry,
+ * etc). As an example, bh in the extent directory case is a data
+ * block, in the inline-data case it actually points to an inode.
*/
-int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
+struct buffer_head *ocfs2_find_entry(const char *name, int namelen,
+ struct inode *dir,
+ struct ocfs2_dir_entry **res_dir)
+{
+ *res_dir = NULL;
+
+ if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ return ocfs2_find_entry_id(name, namelen, dir, res_dir);
+
+ return ocfs2_find_entry_el(name, namelen, dir, res_dir);
+}
+
+/*
+ * Update inode number and type of a previously found directory entry.
+ */
+int ocfs2_update_entry(struct inode *dir, handle_t *handle,
+ struct buffer_head *de_bh, struct ocfs2_dir_entry *de,
+ struct inode *new_entry_inode)
+{
+ int ret;
+
+ /*
+ * The same code works fine for both inline-data and extent
+ * based directories, so no need to split this up.
+ */
+
+ ret = ocfs2_journal_access(handle, dir, de_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ de->inode = cpu_to_le64(OCFS2_I(new_entry_inode)->ip_blkno);
+ ocfs2_set_de_type(de, new_entry_inode->i_mode);
+
+ ocfs2_journal_dirty(handle, de_bh);
+
+out:
+ return ret;
+}
+
+static int __ocfs2_delete_entry(handle_t *handle, struct inode *dir,
+ struct ocfs2_dir_entry *de_del,
+ struct buffer_head *bh, char *first_de,
+ unsigned int bytes)
+{
+ struct ocfs2_dir_entry *de, *pde;
+ int i, status = -ENOENT;
+
+ mlog_entry("(0x%p, 0x%p, 0x%p, 0x%p)\n", handle, dir, de_del, bh);
+
+ i = 0;
+ pde = NULL;
+ de = (struct ocfs2_dir_entry *) first_de;
+ while (i < bytes) {
+ if (!ocfs2_check_dir_entry(dir, de, bh, i)) {
+ status = -EIO;
+ mlog_errno(status);
+ goto bail;
+ }
+ if (de == de_del) {
+ status = ocfs2_journal_access(handle, dir, bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ status = -EIO;
+ mlog_errno(status);
+ goto bail;
+ }
+ if (pde)
+ pde->rec_len =
+ cpu_to_le16(le16_to_cpu(pde->rec_len) +
+ le16_to_cpu(de->rec_len));
+ else
+ de->inode = 0;
+ dir->i_version++;
+ status = ocfs2_journal_dirty(handle, bh);
+ goto bail;
+ }
+ i += le16_to_cpu(de->rec_len);
+ pde = de;
+ de = (struct ocfs2_dir_entry *)((char *)de + le16_to_cpu(de->rec_len));
+ }
+bail:
+ mlog_exit(status);
+ return status;
+}
+
+static inline int ocfs2_delete_entry_id(handle_t *handle,
+ struct inode *dir,
+ struct ocfs2_dir_entry *de_del,
+ struct buffer_head *bh)
+{
+ int ret;
+ struct buffer_head *di_bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_inline_data *data;
+
+ ret = ocfs2_read_block(OCFS2_SB(dir->i_sb), OCFS2_I(dir)->ip_blkno,
+ &di_bh, OCFS2_BH_CACHED, dir);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ di = (struct ocfs2_dinode *)di_bh->b_data;
+ data = &di->id2.i_data;
+
+ ret = __ocfs2_delete_entry(handle, dir, de_del, bh, data->id_data,
+ i_size_read(dir));
+
+ brelse(di_bh);
+out:
+ return ret;
+}
+
+static inline int ocfs2_delete_entry_el(handle_t *handle,
+ struct inode *dir,
+ struct ocfs2_dir_entry *de_del,
+ struct buffer_head *bh)
+{
+ return __ocfs2_delete_entry(handle, dir, de_del, bh, bh->b_data,
+ bh->b_size);
+}
+
+/*
+ * ocfs2_delete_entry deletes a directory entry by merging it with the
+ * previous entry
+ */
+int ocfs2_delete_entry(handle_t *handle,
+ struct inode *dir,
+ struct ocfs2_dir_entry *de_del,
+ struct buffer_head *bh)
+{
+ if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ return ocfs2_delete_entry_id(handle, dir, de_del, bh);
+
+ return ocfs2_delete_entry_el(handle, dir, de_del, bh);
+}
+
+/*
+ * Check whether 'de' has enough room to hold an entry of
+ * 'new_rec_len' bytes.
+ */
+static inline int ocfs2_dirent_would_fit(struct ocfs2_dir_entry *de,
+ unsigned int new_rec_len)
+{
+ unsigned int de_really_used;
+
+ /* Check whether this is an empty record with enough space */
+ if (le64_to_cpu(de->inode) == 0 &&
+ le16_to_cpu(de->rec_len) >= new_rec_len)
+ return 1;
+
+ /*
+ * Record might have free space at the end which we can
+ * use.
+ */
+ de_really_used = OCFS2_DIR_REC_LEN(de->name_len);
+ if (le16_to_cpu(de->rec_len) >= (de_really_used + new_rec_len))
+ return 1;
+
+ return 0;
+}
+
+/* we don't always have a dentry for what we want to add, so people
+ * like orphan dir can call this instead.
+ *
+ * If you pass me insert_bh, I'll skip the search of the other dir
+ * blocks and put the record in there.
+ */
+int __ocfs2_add_entry(handle_t *handle,
+ struct inode *dir,
+ const char *name, int namelen,
+ struct inode *inode, u64 blkno,
+ struct buffer_head *parent_fe_bh,
+ struct buffer_head *insert_bh)
+{
+ unsigned long offset;
+ unsigned short rec_len;
+ struct ocfs2_dir_entry *de, *de1;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)parent_fe_bh->b_data;
+ struct super_block *sb = dir->i_sb;
+ int retval, status;
+ unsigned int size = sb->s_blocksize;
+ char *data_start = insert_bh->b_data;
+
+ mlog_entry_void();
+
+ if (!namelen)
+ return -EINVAL;
+
+ if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ data_start = di->id2.i_data.id_data;
+ size = i_size_read(dir);
+
+ BUG_ON(insert_bh != parent_fe_bh);
+ }
+
+ rec_len = OCFS2_DIR_REC_LEN(namelen);
+ offset = 0;
+ de = (struct ocfs2_dir_entry *) data_start;
+ while (1) {
+ BUG_ON((char *)de >= (size + data_start));
+
+ /* These checks should've already been passed by the
+ * prepare function, but I guess we can leave them
+ * here anyway. */
+ if (!ocfs2_check_dir_entry(dir, de, insert_bh, offset)) {
+ retval = -ENOENT;
+ goto bail;
+ }
+ if (ocfs2_match(namelen, name, de)) {
+ retval = -EEXIST;
+ goto bail;
+ }
+
+ if (ocfs2_dirent_would_fit(de, rec_len)) {
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+ retval = ocfs2_mark_inode_dirty(handle, dir, parent_fe_bh);
+ if (retval < 0) {
+ mlog_errno(retval);
+ goto bail;
+ }
+
+ status = ocfs2_journal_access(handle, dir, insert_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ /* By now the buffer is marked for journaling */
+ offset += le16_to_cpu(de->rec_len);
+ if (le64_to_cpu(de->inode)) {
+ de1 = (struct ocfs2_dir_entry *)((char *) de +
+ OCFS2_DIR_REC_LEN(de->name_len));
+ de1->rec_len =
+ cpu_to_le16(le16_to_cpu(de->rec_len) -
+ OCFS2_DIR_REC_LEN(de->name_len));
+ de->rec_len = cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
+ de = de1;
+ }
+ de->file_type = OCFS2_FT_UNKNOWN;
+ if (blkno) {
+ de->inode = cpu_to_le64(blkno);
+ ocfs2_set_de_type(de, inode->i_mode);
+ } else
+ de->inode = 0;
+ de->name_len = namelen;
+ memcpy(de->name, name, namelen);
+
+ dir->i_version++;
+ status = ocfs2_journal_dirty(handle, insert_bh);
+ retval = 0;
+ goto bail;
+ }
+ offset += le16_to_cpu(de->rec_len);
+ de = (struct ocfs2_dir_entry *) ((char *) de + le16_to_cpu(de->rec_len));
+ }
+
+ /* when you think about it, the assert above should prevent us
+ * from ever getting here. */
+ retval = -ENOSPC;
+bail:
+
+ mlog_exit(retval);
+ return retval;
+}
+
+static int ocfs2_dir_foreach_blk_id(struct inode *inode,
+ unsigned long *f_version,
+ loff_t *f_pos, void *priv,
+ filldir_t filldir, int *filldir_err)
+{
+ int ret, i, filldir_ret;
+ unsigned long offset = *f_pos;
+ struct buffer_head *di_bh = NULL;
+ struct ocfs2_dinode *di;
+ struct ocfs2_inline_data *data;
+ struct ocfs2_dir_entry *de;
+
+ ret = ocfs2_read_block(OCFS2_SB(inode->i_sb), OCFS2_I(inode)->ip_blkno,
+ &di_bh, OCFS2_BH_CACHED, inode);
+ if (ret) {
+ mlog(ML_ERROR, "Unable to read inode block for dir %llu\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ goto out;
+ }
+
+ di = (struct ocfs2_dinode *)di_bh->b_data;
+ data = &di->id2.i_data;
+
+ while (*f_pos < i_size_read(inode)) {
+revalidate:
+ /* If the dir block has changed since the last call to
+ * readdir(2), then we might be pointing to an invalid
+ * dirent right now. Scan from the start of the block
+ * to make sure. */
+ if (*f_version != inode->i_version) {
+ for (i = 0; i < i_size_read(inode) && i < offset; ) {
+ de = (struct ocfs2_dir_entry *)
+ (data->id_data + i);
+ /* It's too expensive to do a full
+ * dirent test each time round this
+ * loop, but we do have to test at
+ * least that it is non-zero. A
+ * failure will be detected in the
+ * dirent test below. */
+ if (le16_to_cpu(de->rec_len) <
+ OCFS2_DIR_REC_LEN(1))
+ break;
+ i += le16_to_cpu(de->rec_len);
+ }
+ *f_pos = offset = i;
+ *f_version = inode->i_version;
+ }
+
+ de = (struct ocfs2_dir_entry *) (data->id_data + *f_pos);
+ if (!ocfs2_check_dir_entry(inode, de, di_bh, *f_pos)) {
+ /* On error, skip the f_pos to the end. */
+ *f_pos = i_size_read(inode);
+ goto out;
+ }
+ offset += le16_to_cpu(de->rec_len);
+ if (le64_to_cpu(de->inode)) {
+ /* We might block in the next section
+ * if the data destination is
+ * currently swapped out. So, use a
+ * version stamp to detect whether or
+ * not the directory has been modified
+ * during the copy operation.
+ */
+ unsigned long version = *f_version;
+ unsigned char d_type = DT_UNKNOWN;
+
+ if (de->file_type < OCFS2_FT_MAX)
+ d_type = ocfs2_filetype_table[de->file_type];
+
+ filldir_ret = filldir(priv, de->name,
+ de->name_len,
+ *f_pos,
+ le64_to_cpu(de->inode),
+ d_type);
+ if (filldir_ret) {
+ if (filldir_err)
+ *filldir_err = filldir_ret;
+ break;
+ }
+ if (version != *f_version)
+ goto revalidate;
+ }
+ *f_pos += le16_to_cpu(de->rec_len);
+ }
+
+out:
+ brelse(di_bh);
+
+ return 0;
+}
+
+static int ocfs2_dir_foreach_blk_el(struct inode *inode,
+ unsigned long *f_version,
+ loff_t *f_pos, void *priv,
+ filldir_t filldir, int *filldir_err)
{
int error = 0;
unsigned long offset, blk, last_ra_blk = 0;
@@ -79,45 +687,23 @@ int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
struct buffer_head * bh, * tmp;
struct ocfs2_dir_entry * de;
int err;
- struct inode *inode = filp->f_path.dentry->d_inode;
struct super_block * sb = inode->i_sb;
unsigned int ra_sectors = 16;
- int lock_level = 0;
-
- mlog_entry("dirino=%llu\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
stored = 0;
bh = NULL;
- error = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level);
- if (lock_level && error >= 0) {
- /* We release EX lock which used to update atime
- * and get PR lock again to reduce contention
- * on commonly accessed directories. */
- ocfs2_meta_unlock(inode, 1);
- lock_level = 0;
- error = ocfs2_meta_lock(inode, NULL, 0);
- }
- if (error < 0) {
- if (error != -ENOENT)
- mlog_errno(error);
- /* we haven't got any yet, so propagate the error. */
- stored = error;
- goto bail_nolock;
- }
+ offset = (*f_pos) & (sb->s_blocksize - 1);
- offset = filp->f_pos & (sb->s_blocksize - 1);
-
- while (!error && !stored && filp->f_pos < i_size_read(inode)) {
- blk = (filp->f_pos) >> sb->s_blocksize_bits;
+ while (!error && !stored && *f_pos < i_size_read(inode)) {
+ blk = (*f_pos) >> sb->s_blocksize_bits;
bh = ocfs2_bread(inode, blk, &err, 0);
if (!bh) {
mlog(ML_ERROR,
"directory #%llu contains a hole at offset %lld\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
- filp->f_pos);
- filp->f_pos += sb->s_blocksize - offset;
+ *f_pos);
+ *f_pos += sb->s_blocksize - offset;
continue;
}
@@ -143,7 +729,7 @@ revalidate:
* readdir(2), then we might be pointing to an invalid
* dirent right now. Scan from the start of the block
* to make sure. */
- if (filp->f_version != inode->i_version) {
+ if (*f_version != inode->i_version) {
for (i = 0; i < sb->s_blocksize && i < offset; ) {
de = (struct ocfs2_dir_entry *) (bh->b_data + i);
/* It's too expensive to do a full
@@ -158,21 +744,20 @@ revalidate:
i += le16_to_cpu(de->rec_len);
}
offset = i;
- filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
+ *f_pos = ((*f_pos) & ~(sb->s_blocksize - 1))
| offset;
- filp->f_version = inode->i_version;
+ *f_version = inode->i_version;
}
- while (!error && filp->f_pos < i_size_read(inode)
+ while (!error && *f_pos < i_size_read(inode)
&& offset < sb->s_blocksize) {
de = (struct ocfs2_dir_entry *) (bh->b_data + offset);
if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
/* On error, skip the f_pos to the
next block. */
- filp->f_pos = (filp->f_pos |
- (sb->s_blocksize - 1)) + 1;
+ *f_pos = ((*f_pos) | (sb->s_blocksize - 1)) + 1;
brelse(bh);
- goto bail;
+ goto out;
}
offset += le16_to_cpu(de->rec_len);
if (le64_to_cpu(de->inode)) {
@@ -183,36 +768,109 @@ revalidate:
* not the directory has been modified
* during the copy operation.
*/
- unsigned long version = filp->f_version;
+ unsigned long version = *f_version;
unsigned char d_type = DT_UNKNOWN;
if (de->file_type < OCFS2_FT_MAX)
d_type = ocfs2_filetype_table[de->file_type];
- error = filldir(dirent, de->name,
+ error = filldir(priv, de->name,
de->name_len,
- filp->f_pos,
- ino_from_blkno(sb, le64_to_cpu(de->inode)),
+ *f_pos,
+ le64_to_cpu(de->inode),
d_type);
- if (error)
+ if (error) {
+ if (filldir_err)
+ *filldir_err = error;
break;
- if (version != filp->f_version)
+ }
+ if (version != *f_version)
goto revalidate;
stored ++;
}
- filp->f_pos += le16_to_cpu(de->rec_len);
+ *f_pos += le16_to_cpu(de->rec_len);
}
offset = 0;
brelse(bh);
}
stored = 0;
-bail:
+out:
+ return stored;
+}
+
+static int ocfs2_dir_foreach_blk(struct inode *inode, unsigned long *f_version,
+ loff_t *f_pos, void *priv, filldir_t filldir,
+ int *filldir_err)
+{
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ return ocfs2_dir_foreach_blk_id(inode, f_version, f_pos, priv,
+ filldir, filldir_err);
+
+ return ocfs2_dir_foreach_blk_el(inode, f_version, f_pos, priv, filldir,
+ filldir_err);
+}
+
+/*
+ * This is intended to be called from inside other kernel functions,
+ * so we fake some arguments.
+ */
+int ocfs2_dir_foreach(struct inode *inode, loff_t *f_pos, void *priv,
+ filldir_t filldir)
+{
+ int ret = 0, filldir_err = 0;
+ unsigned long version = inode->i_version;
+
+ while (*f_pos < i_size_read(inode)) {
+ ret = ocfs2_dir_foreach_blk(inode, &version, f_pos, priv,
+ filldir, &filldir_err);
+ if (ret || filldir_err)
+ break;
+ }
+
+ if (ret > 0)
+ ret = -EIO;
+
+ return 0;
+}
+
+/*
+ * ocfs2_readdir()
+ *
+ */
+int ocfs2_readdir(struct file * filp, void * dirent, filldir_t filldir)
+{
+ int error = 0;
+ struct inode *inode = filp->f_path.dentry->d_inode;
+ int lock_level = 0;
+
+ mlog_entry("dirino=%llu\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+
+ error = ocfs2_meta_lock_atime(inode, filp->f_vfsmnt, &lock_level);
+ if (lock_level && error >= 0) {
+ /* We release EX lock which used to update atime
+ * and get PR lock again to reduce contention
+ * on commonly accessed directories. */
+ ocfs2_meta_unlock(inode, 1);
+ lock_level = 0;
+ error = ocfs2_meta_lock(inode, NULL, 0);
+ }
+ if (error < 0) {
+ if (error != -ENOENT)
+ mlog_errno(error);
+ /* we haven't got any yet, so propagate the error. */
+ goto bail_nolock;
+ }
+
+ error = ocfs2_dir_foreach_blk(inode, &filp->f_version, &filp->f_pos,
+ dirent, filldir, NULL);
+
ocfs2_meta_unlock(inode, lock_level);
bail_nolock:
- mlog_exit(stored);
+ mlog_exit(error);
- return stored;
+ return error;
}
/*
@@ -252,6 +910,23 @@ leave:
return status;
}
+/*
+ * Convenience function for callers which just want the block number
+ * mapped to a name and don't require the full dirent info, etc.
+ */
+int ocfs2_lookup_ino_from_name(struct inode *dir, const char *name,
+ int namelen, u64 *blkno)
+{
+ int ret;
+ struct buffer_head *bh = NULL;
+ struct ocfs2_dir_entry *dirent = NULL;
+
+ ret = ocfs2_find_files_on_disk(name, namelen, blkno, dir, &bh, &dirent);
+ brelse(bh);
+
+ return ret;
+}
+
/* Check for a name within a directory.
*
* Return 0 if the name does not exist
@@ -284,77 +959,414 @@ bail:
return ret;
}
+struct ocfs2_empty_dir_priv {
+ unsigned seen_dot;
+ unsigned seen_dot_dot;
+ unsigned seen_other;
+};
+static int ocfs2_empty_dir_filldir(void *priv, const char *name, int name_len,
+ loff_t pos, u64 ino, unsigned type)
+{
+ struct ocfs2_empty_dir_priv *p = priv;
+
+ /*
+ * Check the positions of "." and ".." records to be sure
+ * they're in the correct place.
+ */
+ if (name_len == 1 && !strncmp(".", name, 1) && pos == 0) {
+ p->seen_dot = 1;
+ return 0;
+ }
+
+ if (name_len == 2 && !strncmp("..", name, 2) &&
+ pos == OCFS2_DIR_REC_LEN(1)) {
+ p->seen_dot_dot = 1;
+ return 0;
+ }
+
+ p->seen_other = 1;
+ return 1;
+}
/*
* routine to check that the specified directory is empty (for rmdir)
+ *
+ * Returns 1 if dir is empty, zero otherwise.
*/
int ocfs2_empty_dir(struct inode *inode)
{
- unsigned long offset;
- struct buffer_head * bh;
- struct ocfs2_dir_entry * de, * de1;
- struct super_block * sb;
- int err;
+ int ret;
+ loff_t start = 0;
+ struct ocfs2_empty_dir_priv priv;
+
+ memset(&priv, 0, sizeof(priv));
+
+ ret = ocfs2_dir_foreach(inode, &start, &priv, ocfs2_empty_dir_filldir);
+ if (ret)
+ mlog_errno(ret);
- sb = inode->i_sb;
- if ((i_size_read(inode) <
- (OCFS2_DIR_REC_LEN(1) + OCFS2_DIR_REC_LEN(2))) ||
- !(bh = ocfs2_bread(inode, 0, &err, 0))) {
- mlog(ML_ERROR, "bad directory (dir #%llu) - no data block\n",
+ if (!priv.seen_dot || !priv.seen_dot_dot) {
+ mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
+ /*
+ * XXX: Is it really safe to allow an unlink to continue?
+ */
return 1;
}
- de = (struct ocfs2_dir_entry *) bh->b_data;
- de1 = (struct ocfs2_dir_entry *)
- ((char *)de + le16_to_cpu(de->rec_len));
- if ((le64_to_cpu(de->inode) != OCFS2_I(inode)->ip_blkno) ||
- !le64_to_cpu(de1->inode) ||
- strcmp(".", de->name) ||
- strcmp("..", de1->name)) {
- mlog(ML_ERROR, "bad directory (dir #%llu) - no `.' or `..'\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno);
- brelse(bh);
- return 1;
+ return !priv.seen_other;
+}
+
+static void ocfs2_fill_initial_dirents(struct inode *inode,
+ struct inode *parent,
+ char *start, unsigned int size)
+{
+ struct ocfs2_dir_entry *de = (struct ocfs2_dir_entry *)start;
+
+ de->inode = cpu_to_le64(OCFS2_I(inode)->ip_blkno);
+ de->name_len = 1;
+ de->rec_len =
+ cpu_to_le16(OCFS2_DIR_REC_LEN(de->name_len));
+ strcpy(de->name, ".");
+ ocfs2_set_de_type(de, S_IFDIR);
+
+ de = (struct ocfs2_dir_entry *) ((char *)de + le16_to_cpu(de->rec_len));
+ de->inode = cpu_to_le64(OCFS2_I(parent)->ip_blkno);
+ de->rec_len = cpu_to_le16(size - OCFS2_DIR_REC_LEN(1));
+ de->name_len = 2;
+ strcpy(de->name, "..");
+ ocfs2_set_de_type(de, S_IFDIR);
+}
+
+/*
+ * This works together with code in ocfs2_mknod_locked() which sets
+ * the inline-data flag and initializes the inline-data section.
+ */
+static int ocfs2_fill_new_dir_id(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct inode *parent,
+ struct inode *inode,
+ struct buffer_head *di_bh)
+{
+ int ret;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_inline_data *data = &di->id2.i_data;
+ unsigned int size = le16_to_cpu(data->id_count);
+
+ ret = ocfs2_journal_access(handle, inode, di_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
}
- offset = le16_to_cpu(de->rec_len) + le16_to_cpu(de1->rec_len);
- de = (struct ocfs2_dir_entry *)((char *)de1 + le16_to_cpu(de1->rec_len));
- while (offset < i_size_read(inode) ) {
- if (!bh || (void *)de >= (void *)(bh->b_data + sb->s_blocksize)) {
- brelse(bh);
- bh = ocfs2_bread(inode,
- offset >> sb->s_blocksize_bits, &err, 0);
- if (!bh) {
- mlog(ML_ERROR, "dir %llu has a hole at %lu\n",
- (unsigned long long)OCFS2_I(inode)->ip_blkno, offset);
- offset += sb->s_blocksize;
- continue;
- }
- de = (struct ocfs2_dir_entry *) bh->b_data;
- }
- if (!ocfs2_check_dir_entry(inode, de, bh, offset)) {
- brelse(bh);
- return 1;
+
+ ocfs2_fill_initial_dirents(inode, parent, data->id_data, size);
+
+ ocfs2_journal_dirty(handle, di_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ i_size_write(inode, size);
+ inode->i_nlink = 2;
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
+
+ ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
+ if (ret < 0)
+ mlog_errno(ret);
+
+out:
+ return ret;
+}
+
+static int ocfs2_fill_new_dir_el(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct inode *parent,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct ocfs2_alloc_context *data_ac)
+{
+ int status;
+ struct buffer_head *new_bh = NULL;
+
+ mlog_entry_void();
+
+ status = ocfs2_do_extend_dir(osb->sb, handle, inode, fe_bh,
+ data_ac, NULL, &new_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ ocfs2_set_new_buffer_uptodate(inode, new_bh);
+
+ status = ocfs2_journal_access(handle, inode, new_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+ memset(new_bh->b_data, 0, osb->sb->s_blocksize);
+
+ ocfs2_fill_initial_dirents(inode, parent, new_bh->b_data,
+ osb->sb->s_blocksize);
+
+ status = ocfs2_journal_dirty(handle, new_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ i_size_write(inode, inode->i_sb->s_blocksize);
+ inode->i_nlink = 2;
+ inode->i_blocks = ocfs2_inode_sector_count(inode);
+ status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = 0;
+bail:
+ if (new_bh)
+ brelse(new_bh);
+
+ mlog_exit(status);
+ return status;
+}
+
+int ocfs2_fill_new_dir(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct inode *parent,
+ struct inode *inode,
+ struct buffer_head *fe_bh,
+ struct ocfs2_alloc_context *data_ac)
+{
+ BUG_ON(!ocfs2_supports_inline_data(osb) && data_ac == NULL);
+
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
+ return ocfs2_fill_new_dir_id(osb, handle, parent, inode, fe_bh);
+
+ return ocfs2_fill_new_dir_el(osb, handle, parent, inode, fe_bh,
+ data_ac);
+}
+
+static void ocfs2_expand_last_dirent(char *start, unsigned int old_size,
+ unsigned int new_size)
+{
+ struct ocfs2_dir_entry *de;
+ struct ocfs2_dir_entry *prev_de;
+ char *de_buf, *limit;
+ unsigned int bytes = new_size - old_size;
+
+ limit = start + old_size;
+ de_buf = start;
+ de = (struct ocfs2_dir_entry *)de_buf;
+ do {
+ prev_de = de;
+ de_buf += le16_to_cpu(de->rec_len);
+ de = (struct ocfs2_dir_entry *)de_buf;
+ } while (de_buf < limit);
+
+ le16_add_cpu(&prev_de->rec_len, bytes);
+}
+
+/*
+ * We allocate enough clusters to fulfill "blocks_wanted", but set
+ * i_size to exactly one block. Ocfs2_extend_dir() will handle the
+ * rest automatically for us.
+ *
+ * *first_block_bh is a pointer to the 1st data block allocated to the
+ * directory.
+ */
+static int ocfs2_expand_inline_dir(struct inode *dir, struct buffer_head *di_bh,
+ unsigned int blocks_wanted,
+ struct buffer_head **first_block_bh)
+{
+ int ret, credits = OCFS2_INLINE_TO_EXTENTS_CREDITS;
+ u32 alloc, bit_off, len;
+ struct super_block *sb = dir->i_sb;
+ u64 blkno, bytes = blocks_wanted << sb->s_blocksize_bits;
+ struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
+ struct ocfs2_inode_info *oi = OCFS2_I(dir);
+ struct ocfs2_alloc_context *data_ac;
+ struct buffer_head *dirdata_bh = NULL;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ handle_t *handle;
+
+ alloc = ocfs2_clusters_for_bytes(sb, bytes);
+
+ /*
+ * We should never need more than 2 clusters for this -
+ * maximum dirent size is far less than one block. In fact,
+ * the only time we'd need more than one cluster is if
+ * blocksize == clustersize and the dirent won't fit in the
+ * extra space that the expansion to a single block gives. As
+ * of today, that only happens on 4k/4k file systems.
+ */
+ BUG_ON(alloc > 2);
+
+ ret = ocfs2_reserve_clusters(osb, alloc, &data_ac);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ down_write(&oi->ip_alloc_sem);
+
+ /*
+ * Prepare for worst case allocation scenario of two seperate
+ * extents.
+ */
+ if (alloc == 2)
+ credits += OCFS2_SUBALLOC_ALLOC;
+
+ handle = ocfs2_start_trans(osb, credits);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out_sem;
+ }
+
+ /*
+ * Try to claim as many clusters as the bitmap can give though
+ * if we only get one now, that's enough to continue. The rest
+ * will be claimed after the conversion to extents.
+ */
+ ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ /*
+ * Operations are carefully ordered so that we set up the new
+ * data block first. The conversion from inline data to
+ * extents follows.
+ */
+ blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
+ dirdata_bh = sb_getblk(sb, blkno);
+ if (!dirdata_bh) {
+ ret = -EIO;
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ ocfs2_set_new_buffer_uptodate(dir, dirdata_bh);
+
+ ret = ocfs2_journal_access(handle, dir, dirdata_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ memcpy(dirdata_bh->b_data, di->id2.i_data.id_data, i_size_read(dir));
+ memset(dirdata_bh->b_data + i_size_read(dir), 0,
+ sb->s_blocksize - i_size_read(dir));
+ ocfs2_expand_last_dirent(dirdata_bh->b_data, i_size_read(dir),
+ sb->s_blocksize);
+
+ ret = ocfs2_journal_dirty(handle, dirdata_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ /*
+ * Set extent, i_size, etc on the directory. After this, the
+ * inode should contain the same exact dirents as before and
+ * be fully accessible from system calls.
+ *
+ * We let the later dirent insert modify c/mtime - to the user
+ * the data hasn't changed.
+ */
+ ret = ocfs2_journal_access(handle, dir, di_bh,
+ OCFS2_JOURNAL_ACCESS_CREATE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ spin_lock(&oi->ip_lock);
+ oi->ip_dyn_features &= ~OCFS2_INLINE_DATA_FL;
+ di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
+ spin_unlock(&oi->ip_lock);
+
+ ocfs2_dinode_new_extent_list(dir, di);
+
+ i_size_write(dir, sb->s_blocksize);
+ dir->i_mtime = dir->i_ctime = CURRENT_TIME;
+
+ di->i_size = cpu_to_le64(sb->s_blocksize);
+ di->i_ctime = di->i_mtime = cpu_to_le64(dir->i_ctime.tv_sec);
+ di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(dir->i_ctime.tv_nsec);
+ dir->i_blocks = ocfs2_inode_sector_count(dir);
+
+ /*
+ * This should never fail as our extent list is empty and all
+ * related blocks have been journaled already.
+ */
+ ret = ocfs2_insert_extent(osb, handle, dir, di_bh, 0, blkno, len, 0,
+ NULL);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_journal_dirty(handle, di_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ /*
+ * We asked for two clusters, but only got one in the 1st
+ * pass. Claim the 2nd cluster as a separate extent.
+ */
+ if (alloc > len) {
+ ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off,
+ &len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
}
- if (le64_to_cpu(de->inode)) {
- brelse(bh);
- return 0;
+ blkno = ocfs2_clusters_to_blocks(dir->i_sb, bit_off);
+
+ ret = ocfs2_insert_extent(osb, handle, dir, di_bh, 1, blkno,
+ len, 0, NULL);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
}
- offset += le16_to_cpu(de->rec_len);
- de = (struct ocfs2_dir_entry *)
- ((char *)de + le16_to_cpu(de->rec_len));
}
- brelse(bh);
- return 1;
+
+ *first_block_bh = dirdata_bh;
+ dirdata_bh = NULL;
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+
+out_sem:
+ up_write(&oi->ip_alloc_sem);
+
+out:
+ if (data_ac)
+ ocfs2_free_alloc_context(data_ac);
+
+ brelse(dirdata_bh);
+
+ return ret;
}
/* returns a bh of the 1st new block in the allocation. */
-int ocfs2_do_extend_dir(struct super_block *sb,
- handle_t *handle,
- struct inode *dir,
- struct buffer_head *parent_fe_bh,
- struct ocfs2_alloc_context *data_ac,
- struct ocfs2_alloc_context *meta_ac,
- struct buffer_head **new_bh)
+static int ocfs2_do_extend_dir(struct super_block *sb,
+ handle_t *handle,
+ struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ struct buffer_head **new_bh)
{
int status;
int extend;
@@ -396,10 +1408,18 @@ bail:
return status;
}
-/* assumes you already have a cluster lock on the directory. */
+/*
+ * Assumes you already have a cluster lock on the directory.
+ *
+ * 'blocks_wanted' is only used if we have an inline directory which
+ * is to be turned into an extent based one. The size of the dirent to
+ * insert might be larger than the space gained by growing to just one
+ * block, so we may have to grow the inode by two blocks in that case.
+ */
static int ocfs2_extend_dir(struct ocfs2_super *osb,
struct inode *dir,
struct buffer_head *parent_fe_bh,
+ unsigned int blocks_wanted,
struct buffer_head **new_de_bh)
{
int status = 0;
@@ -415,6 +1435,38 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
mlog_entry_void();
+ if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ status = ocfs2_expand_inline_dir(dir, parent_fe_bh,
+ blocks_wanted, &new_bh);
+ if (status) {
+ mlog_errno(status);
+ goto bail;
+ }
+
+ if (blocks_wanted == 1) {
+ /*
+ * If the new dirent will fit inside the space
+ * created by pushing out to one block, then
+ * we can complete the operation
+ * here. Otherwise we have to expand i_size
+ * and format the 2nd block below.
+ */
+ BUG_ON(new_bh == NULL);
+ goto bail_bh;
+ }
+
+ /*
+ * Get rid of 'new_bh' - we want to format the 2nd
+ * data block and return that instead.
+ */
+ brelse(new_bh);
+ new_bh = NULL;
+
+ dir_i_size = i_size_read(dir);
+ credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
+ goto do_extend;
+ }
+
dir_i_size = i_size_read(dir);
mlog(0, "extending dir %llu (i_size = %lld)\n",
(unsigned long long)OCFS2_I(dir)->ip_blkno, dir_i_size);
@@ -452,6 +1504,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
credits = OCFS2_SIMPLE_DIR_EXTEND_CREDITS;
}
+do_extend:
down_write(&OCFS2_I(dir)->ip_alloc_sem);
drop_alloc_sem = 1;
@@ -497,6 +1550,7 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
goto bail;
}
+bail_bh:
*new_de_bh = new_bh;
get_bh(*new_de_bh);
bail:
@@ -517,41 +1571,71 @@ bail:
return status;
}
-/*
- * Search the dir for a good spot, extending it if necessary. The
- * block containing an appropriate record is returned in ret_de_bh.
- */
-int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
- struct inode *dir,
- struct buffer_head *parent_fe_bh,
- const char *name,
- int namelen,
- struct buffer_head **ret_de_bh)
+static int ocfs2_find_dir_space_id(struct inode *dir, struct buffer_head *di_bh,
+ const char *name, int namelen,
+ struct buffer_head **ret_de_bh,
+ unsigned int *blocks_wanted)
{
- unsigned long offset;
- struct buffer_head * bh = NULL;
- unsigned short rec_len;
- struct ocfs2_dinode *fe;
- struct ocfs2_dir_entry *de;
- struct super_block *sb;
- int status;
+ int ret;
+ struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_dir_entry *de, *last_de = NULL;
+ char *de_buf, *limit;
+ unsigned long offset = 0;
+ unsigned int rec_len, new_rec_len;
+
+ de_buf = di->id2.i_data.id_data;
+ limit = de_buf + i_size_read(dir);
+ rec_len = OCFS2_DIR_REC_LEN(namelen);
- mlog_entry_void();
+ while (de_buf < limit) {
+ de = (struct ocfs2_dir_entry *)de_buf;
- mlog(0, "getting ready to insert namelen %d into dir %llu\n",
- namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
+ if (!ocfs2_check_dir_entry(dir, de, di_bh, offset)) {
+ ret = -ENOENT;
+ goto out;
+ }
+ if (ocfs2_match(namelen, name, de)) {
+ ret = -EEXIST;
+ goto out;
+ }
+ if (ocfs2_dirent_would_fit(de, rec_len)) {
+ /* Ok, we found a spot. Return this bh and let
+ * the caller actually fill it in. */
+ *ret_de_bh = di_bh;
+ get_bh(*ret_de_bh);
+ ret = 0;
+ goto out;
+ }
- BUG_ON(!S_ISDIR(dir->i_mode));
- fe = (struct ocfs2_dinode *) parent_fe_bh->b_data;
- BUG_ON(le64_to_cpu(fe->i_size) != i_size_read(dir));
+ last_de = de;
+ de_buf += le16_to_cpu(de->rec_len);
+ offset += le16_to_cpu(de->rec_len);
+ }
- sb = dir->i_sb;
+ /*
+ * We're going to require expansion of the directory - figure
+ * out how many blocks we'll need so that a place for the
+ * dirent can be found.
+ */
+ *blocks_wanted = 1;
+ new_rec_len = le16_to_cpu(last_de->rec_len) + (dir->i_sb->s_blocksize - i_size_read(dir));
+ if (new_rec_len < (rec_len + OCFS2_DIR_REC_LEN(last_de->name_len)))
+ *blocks_wanted = 2;
+
+ ret = -ENOSPC;
+out:
+ return ret;
+}
- if (!namelen) {
- status = -EINVAL;
- mlog_errno(status);
- goto bail;
- }
+static int ocfs2_find_dir_space_el(struct inode *dir, const char *name,
+ int namelen, struct buffer_head **ret_de_bh)
+{
+ unsigned long offset;
+ struct buffer_head *bh = NULL;
+ unsigned short rec_len;
+ struct ocfs2_dir_entry *de;
+ struct super_block *sb = dir->i_sb;
+ int status;
bh = ocfs2_bread(dir, 0, &status, 0);
if (!bh) {
@@ -568,17 +1652,11 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
bh = NULL;
if (i_size_read(dir) <= offset) {
- status = ocfs2_extend_dir(osb,
- dir,
- parent_fe_bh,
- &bh);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
- BUG_ON(!bh);
- *ret_de_bh = bh;
- get_bh(*ret_de_bh);
+ /*
+ * Caller will have to expand this
+ * directory.
+ */
+ status = -ENOSPC;
goto bail;
}
bh = ocfs2_bread(dir,
@@ -600,10 +1678,7 @@ int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
status = -EEXIST;
goto bail;
}
- if (((le64_to_cpu(de->inode) == 0) &&
- (le16_to_cpu(de->rec_len) >= rec_len)) ||
- (le16_to_cpu(de->rec_len) >=
- (OCFS2_DIR_REC_LEN(de->name_len) + rec_len))) {
+ if (ocfs2_dirent_would_fit(de, rec_len)) {
/* Ok, we found a spot. Return this bh and let
* the caller actually fill it in. */
*ret_de_bh = bh;
@@ -623,3 +1698,61 @@ bail:
mlog_exit(status);
return status;
}
+
+int ocfs2_prepare_dir_for_insert(struct ocfs2_super *osb,
+ struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ const char *name,
+ int namelen,
+ struct buffer_head **ret_de_bh)
+{
+ int ret;
+ unsigned int blocks_wanted = 1;
+ struct buffer_head *bh = NULL;
+
+ mlog(0, "getting ready to insert namelen %d into dir %llu\n",
+ namelen, (unsigned long long)OCFS2_I(dir)->ip_blkno);
+
+ *ret_de_bh = NULL;
+
+ if (!namelen) {
+ ret = -EINVAL;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (OCFS2_I(dir)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
+ ret = ocfs2_find_dir_space_id(dir, parent_fe_bh, name,
+ namelen, &bh, &blocks_wanted);
+ } else
+ ret = ocfs2_find_dir_space_el(dir, name, namelen, &bh);
+
+ if (ret && ret != -ENOSPC) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (ret == -ENOSPC) {
+ /*
+ * We have to expand the directory to add this name.
+ */
+ BUG_ON(bh);
+
+ ret = ocfs2_extend_dir(osb, dir, parent_fe_bh, blocks_wanted,
+ &bh);
+ if (ret) {
+ if (ret != -ENOSPC)
+ mlog_errno(ret);
+ goto out;
+ }
+
+ BUG_ON(!bh);
+ }
+
+ *ret_de_bh = bh;
+ bh = NULL;
+out:
+ if (bh)
+ brelse(bh);
+ return ret;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-11 05:20:04 +0000