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author | Steven Whitehouse <swhiteho@redhat.com> | 2006-01-30 14:31:50 +0100 |
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committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-01-30 14:31:50 +0100 |
commit | e13940ba56157a663944f2a827be96b6b787e260 (patch) | |
tree | 0bdc3669ed3cd3498b2dd73ed23003976d588c02 /fs/gfs2/dir.c | |
parent | [GFS2] Use mpage_readpage() in gfs2_readpage() (diff) | |
download | linux-e13940ba56157a663944f2a827be96b6b787e260.tar.xz linux-e13940ba56157a663944f2a827be96b6b787e260.zip |
[GFS2] Make dir.c independant of jdata.c
Copy & rename various jdata functions into dir.c. The plan
being that directory metadata format will not change although
the journalled data format for "normal" files will change.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/dir.c')
-rw-r--r-- | fs/gfs2/dir.c | 264 |
1 files changed, 255 insertions, 9 deletions
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c index 93d3704ac58c..ada283a0f5f3 100644 --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -65,11 +65,11 @@ #include "dir.h" #include "glock.h" #include "inode.h" -#include "jdata.h" #include "meta_io.h" #include "quota.h" #include "rgrp.h" #include "trans.h" +#include "bmap.h" #define IS_LEAF 1 /* Hashed (leaf) directory */ #define IS_DINODE 2 /* Linear (stuffed dinode block) directory */ @@ -86,6 +86,252 @@ typedef int (*leaf_call_t) (struct gfs2_inode *dip, uint32_t index, uint32_t len, uint64_t leaf_no, void *data); +static int gfs2_dir_get_buffer(struct gfs2_inode *ip, uint64_t block, int new, + struct buffer_head **bhp) +{ + struct buffer_head *bh; + int error = 0; + + if (new) { + bh = gfs2_meta_new(ip->i_gl, block); + gfs2_trans_add_bh(ip->i_gl, bh, 1); + gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD); + gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); + } else { + error = gfs2_meta_read(ip->i_gl, block, DIO_START | DIO_WAIT, &bh); + if (error) + return error; + if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_JD)) { + brelse(bh); + return -EIO; + } + } + + *bhp = bh; + return 0; +} + + + +static int gfs2_dir_write_stuffed(struct gfs2_inode *ip, const char *buf, + unsigned int offset, unsigned int size) + +{ + struct buffer_head *dibh; + int error; + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + return error; + + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + memcpy(dibh->b_data + offset + sizeof(struct gfs2_inode), buf, size); + if (ip->i_di.di_size < offset + size) + ip->i_di.di_size = offset + size; + ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); + gfs2_dinode_out(&ip->i_di, dibh->b_data); + + brelse(dibh); + + return size; +} + + + +/** + * gfs2_dir_write_data - Write directory information to the inode + * @ip: The GFS2 inode + * @buf: The buffer containing information to be written + * @offset: The file offset to start writing at + * @size: The amount of data to write + * + * Returns: The number of bytes correctly written or error code + */ +static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf, + uint64_t offset, unsigned int size) +{ + struct gfs2_sbd *sdp = ip->i_sbd; + struct buffer_head *dibh; + uint64_t lblock, dblock; + uint32_t extlen = 0; + unsigned int o; + int copied = 0; + int error = 0; + + if (!size) + return 0; + + if (gfs2_is_stuffed(ip) && + offset + size <= sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) + return gfs2_dir_write_stuffed(ip, buf, (unsigned int)offset, size); + + if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip))) + return -EINVAL; + + if (gfs2_is_stuffed(ip)) { + error = gfs2_unstuff_dinode(ip, NULL, NULL); + if (error) + return error; + } + + lblock = offset; + o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header); + + while (copied < size) { + unsigned int amount; + struct buffer_head *bh; + int new; + + amount = size - copied; + if (amount > sdp->sd_sb.sb_bsize - o) + amount = sdp->sd_sb.sb_bsize - o; + + if (!extlen) { + new = 1; + error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen); + if (error) + goto fail; + error = -EIO; + if (gfs2_assert_withdraw(sdp, dblock)) + goto fail; + } + + error = gfs2_dir_get_buffer(ip, dblock, (amount == sdp->sd_jbsize) ? 1 : new, &bh); + if (error) + goto fail; + + gfs2_trans_add_bh(ip->i_gl, bh, 1); + memcpy(bh->b_data + o, buf, amount); + brelse(bh); + if (error) + goto fail; + + copied += amount; + lblock++; + dblock++; + extlen--; + + o = sizeof(struct gfs2_meta_header); + } + +out: + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + return error; + + if (ip->i_di.di_size < offset + copied) + ip->i_di.di_size = offset + copied; + ip->i_di.di_mtime = ip->i_di.di_ctime = get_seconds(); + + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + gfs2_dinode_out(&ip->i_di, dibh->b_data); + brelse(dibh); + + return copied; +fail: + if (copied) + goto out; + return error; +} + +static int gfs2_dir_read_stuffed(struct gfs2_inode *ip, char *buf, + unsigned int offset, unsigned int size) +{ + struct buffer_head *dibh; + int error; + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (!error) { + offset += sizeof(struct gfs2_dinode); + memcpy(buf, dibh->b_data + offset, size); + brelse(dibh); + } + + return (error) ? error : size; +} + + +/** + * gfs2_dir_read_data - Read a data from a directory inode + * @ip: The GFS2 Inode + * @buf: The buffer to place result into + * @offset: File offset to begin jdata_readng from + * @size: Amount of data to transfer + * + * Returns: The amount of data actually copied or the error + */ +static int gfs2_dir_read_data(struct gfs2_inode *ip, char *buf, + uint64_t offset, unsigned int size) +{ + struct gfs2_sbd *sdp = ip->i_sbd; + uint64_t lblock, dblock; + uint32_t extlen = 0; + unsigned int o; + int copied = 0; + int error = 0; + + if (offset >= ip->i_di.di_size) + return 0; + + if ((offset + size) > ip->i_di.di_size) + size = ip->i_di.di_size - offset; + + if (!size) + return 0; + + if (gfs2_is_stuffed(ip)) + return gfs2_dir_read_stuffed(ip, buf, (unsigned int)offset, size); + + if (gfs2_assert_warn(sdp, gfs2_is_jdata(ip))) + return -EINVAL; + + lblock = offset; + o = do_div(lblock, sdp->sd_jbsize) + sizeof(struct gfs2_meta_header); + + while (copied < size) { + unsigned int amount; + struct buffer_head *bh; + int new; + + amount = size - copied; + if (amount > sdp->sd_sb.sb_bsize - o) + amount = sdp->sd_sb.sb_bsize - o; + + if (!extlen) { + new = 0; + error = gfs2_block_map(ip, lblock, &new, &dblock, &extlen); + if (error) + goto fail; + } + + if (extlen > 1) + gfs2_meta_ra(ip->i_gl, dblock, extlen); + + if (dblock) { + error = gfs2_dir_get_buffer(ip, dblock, new, &bh); + if (error) + goto fail; + dblock++; + extlen--; + } else + bh = NULL; + + memcpy(buf, bh->b_data + o, amount); + brelse(bh); + if (error) + goto fail; + + copied += amount; + lblock++; + + o = sizeof(struct gfs2_meta_header); + } + + return copied; +fail: + return (copied) ? copied : error; +} + /** * int gfs2_filecmp - Compare two filenames * @file1: The first filename @@ -428,7 +674,7 @@ static int get_leaf_nr(struct gfs2_inode *dip, uint32_t index, uint64_t leaf_no; int error; - error = gfs2_jdata_read_mem(dip, (char *)&leaf_no, + error = gfs2_dir_read_data(dip, (char *)&leaf_no, index * sizeof(uint64_t), sizeof(uint64_t)); if (error != sizeof(uint64_t)) @@ -683,7 +929,7 @@ static int dir_split_leaf(struct gfs2_inode *dip, uint32_t index, lp = kcalloc(half_len, sizeof(uint64_t), GFP_KERNEL | __GFP_NOFAIL); - error = gfs2_jdata_read_mem(dip, (char *)lp, start * sizeof(uint64_t), + error = gfs2_dir_read_data(dip, (char *)lp, start * sizeof(uint64_t), half_len * sizeof(uint64_t)); if (error != half_len * sizeof(uint64_t)) { if (error >= 0) @@ -696,7 +942,7 @@ static int dir_split_leaf(struct gfs2_inode *dip, uint32_t index, for (x = 0; x < half_len; x++) lp[x] = cpu_to_be64(bn); - error = gfs2_jdata_write_mem(dip, (char *)lp, start * sizeof(uint64_t), + error = gfs2_dir_write_data(dip, (char *)lp, start * sizeof(uint64_t), half_len * sizeof(uint64_t)); if (error != half_len * sizeof(uint64_t)) { if (error >= 0) @@ -816,7 +1062,7 @@ static int dir_double_exhash(struct gfs2_inode *dip) buf = kcalloc(3, sdp->sd_hash_bsize, GFP_KERNEL | __GFP_NOFAIL); for (block = dip->i_di.di_size >> sdp->sd_hash_bsize_shift; block--;) { - error = gfs2_jdata_read_mem(dip, (char *)buf, + error = gfs2_dir_read_data(dip, (char *)buf, block * sdp->sd_hash_bsize, sdp->sd_hash_bsize); if (error != sdp->sd_hash_bsize) { @@ -833,7 +1079,7 @@ static int dir_double_exhash(struct gfs2_inode *dip) *to++ = *from; } - error = gfs2_jdata_write_mem(dip, + error = gfs2_dir_write_data(dip, (char *)buf + sdp->sd_hash_bsize, block * sdp->sd_sb.sb_bsize, sdp->sd_sb.sb_bsize); @@ -1424,7 +1670,7 @@ static int dir_e_read(struct gfs2_inode *dip, uint64_t *offset, void *opaque, ht_offset = index - lp_offset; if (ht_offset_cur != ht_offset) { - error = gfs2_jdata_read_mem(dip, (char *)lp, + error = gfs2_dir_read_data(dip, (char *)lp, ht_offset * sizeof(uint64_t), sdp->sd_hash_bsize); if (error != sdp->sd_hash_bsize) { @@ -1839,7 +2085,7 @@ static int foreach_leaf(struct gfs2_inode *dip, leaf_call_t lc, void *data) ht_offset = index - lp_offset; if (ht_offset_cur != ht_offset) { - error = gfs2_jdata_read_mem(dip, (char *)lp, + error = gfs2_dir_read_data(dip, (char *)lp, ht_offset * sizeof(uint64_t), sdp->sd_hash_bsize); if (error != sdp->sd_hash_bsize) { @@ -1965,7 +2211,7 @@ static int leaf_dealloc(struct gfs2_inode *dip, uint32_t index, uint32_t len, dip->i_di.di_blocks--; } - error = gfs2_jdata_write_mem(dip, ht, index * sizeof(uint64_t), size); + error = gfs2_dir_write_data(dip, ht, index * sizeof(uint64_t), size); if (error != size) { if (error >= 0) error = -EIO; |