slot_hold(qd);
}
+ if (change < 0) /* Reset quiet flag if we freed some blocks */
+ clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
mutex_unlock(&sdp->sd_quota_mutex);
}
+static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
+ unsigned off, void *buf, unsigned bytes)
+{
+ struct inode *inode = &ip->i_inode;
+ struct gfs2_sbd *sdp = GFS2_SB(inode);
+ struct address_space *mapping = inode->i_mapping;
+ struct page *page;
+ struct buffer_head *bh;
+ void *kaddr;
+ u64 blk;
+ unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
+ unsigned to_write = bytes, pg_off = off;
+ int done = 0;
+
+ blk = index << (PAGE_CACHE_SHIFT - sdp->sd_sb.sb_bsize_shift);
+ boff = off % bsize;
+
+ page = find_or_create_page(mapping, index, GFP_NOFS);
+ if (!page)
+ return -ENOMEM;
+ if (!page_has_buffers(page))
+ create_empty_buffers(page, bsize, 0);
+
+ bh = page_buffers(page);
+ while (!done) {
+ /* Find the beginning block within the page */
+ if (pg_off >= ((bnum * bsize) + bsize)) {
+ bh = bh->b_this_page;
+ bnum++;
+ blk++;
+ continue;
+ }
+ if (!buffer_mapped(bh)) {
+ gfs2_block_map(inode, blk, bh, 1);
+ if (!buffer_mapped(bh))
+ goto unlock_out;
+ /* If it's a newly allocated disk block, zero it */
+ if (buffer_new(bh))
+ zero_user(page, bnum * bsize, bh->b_size);
+ }
+ if (PageUptodate(page))
+ set_buffer_uptodate(bh);
+ if (!buffer_uptodate(bh)) {
+ ll_rw_block(READ | REQ_META, 1, &bh);
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(bh))
+ goto unlock_out;
+ }
+ gfs2_trans_add_data(ip->i_gl, bh);
+
+ /* If we need to write to the next block as well */
+ if (to_write > (bsize - boff)) {
+ pg_off += (bsize - boff);
+ to_write -= (bsize - boff);
+ boff = pg_off % bsize;
+ continue;
+ }
+ done = 1;
+ }
+
+ /* Write to the page, now that we have setup the buffer(s) */
+ kaddr = kmap_atomic(page);
+ memcpy(kaddr + off, buf, bytes);
+ flush_dcache_page(page);
+ kunmap_atomic(kaddr);
+ unlock_page(page);
+ page_cache_release(page);
+
+ return 0;
+
+unlock_out:
+ unlock_page(page);
+ page_cache_release(page);
+ return -EIO;
+}
+
+static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
+ loff_t loc)
+{
+ unsigned long pg_beg;
+ unsigned pg_off, nbytes, overflow = 0;
+ int pg_oflow = 0, error;
+ void *ptr;
+
+ nbytes = sizeof(struct gfs2_quota);
+
+ pg_beg = loc >> PAGE_CACHE_SHIFT;
+ pg_off = loc % PAGE_CACHE_SIZE;
+
+ /* If the quota straddles a page boundary, split the write in two */
+ if ((pg_off + nbytes) > PAGE_CACHE_SIZE) {
+ pg_oflow = 1;
+ overflow = (pg_off + nbytes) - PAGE_CACHE_SIZE;
+ }
+
+ ptr = qp;
+ error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
+ nbytes - overflow);
+ /* If there's an overflow, write the remaining bytes to the next page */
+ if (!error && pg_oflow)
+ error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
+ ptr + nbytes - overflow,
+ overflow);
+ return error;
+}
+
/**
* gfs2_adjust_quota - adjust record of current block usage
* @ip: The quota inode
{
struct inode *inode = &ip->i_inode;
struct gfs2_sbd *sdp = GFS2_SB(inode);
- struct address_space *mapping = inode->i_mapping;
- unsigned long index = loc >> PAGE_CACHE_SHIFT;
- unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
- unsigned blocksize, iblock, pos;
- struct buffer_head *bh;
- struct page *page;
- void *kaddr, *ptr;
struct gfs2_quota q;
- int err, nbytes;
+ int err;
u64 size;
if (gfs2_is_stuffed(ip)) {
if (err < 0)
return err;
+ loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
err = -EIO;
be64_add_cpu(&q.qu_value, change);
+ if (((s64)be64_to_cpu(q.qu_value)) < 0)
+ q.qu_value = 0; /* Never go negative on quota usage */
qd->qd_qb.qb_value = q.qu_value;
if (fdq) {
if (fdq->d_fieldmask & QC_SPC_SOFT) {
}
}
- /* Write the quota into the quota file on disk */
- ptr = &q;
- nbytes = sizeof(struct gfs2_quota);
-get_a_page:
- page = find_or_create_page(mapping, index, GFP_NOFS);
- if (!page)
- return -ENOMEM;
-
- blocksize = inode->i_sb->s_blocksize;
- iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
-
- if (!page_has_buffers(page))
- create_empty_buffers(page, blocksize, 0);
-
- bh = page_buffers(page);
- pos = blocksize;
- while (offset >= pos) {
- bh = bh->b_this_page;
- iblock++;
- pos += blocksize;
- }
-
- if (!buffer_mapped(bh)) {
- gfs2_block_map(inode, iblock, bh, 1);
- if (!buffer_mapped(bh))
- goto unlock_out;
- /* If it's a newly allocated disk block for quota, zero it */
- if (buffer_new(bh))
- zero_user(page, pos - blocksize, bh->b_size);
- }
-
- if (PageUptodate(page))
- set_buffer_uptodate(bh);
-
- if (!buffer_uptodate(bh)) {
- ll_rw_block(READ | REQ_META, 1, &bh);
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh))
- goto unlock_out;
- }
-
- gfs2_trans_add_data(ip->i_gl, bh);
-
- kaddr = kmap_atomic(page);
- if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
- nbytes = PAGE_CACHE_SIZE - offset;
- memcpy(kaddr + offset, ptr, nbytes);
- flush_dcache_page(page);
- kunmap_atomic(kaddr);
- unlock_page(page);
- page_cache_release(page);
-
- /* If quota straddles page boundary, we need to update the rest of the
- * quota at the beginning of the next page */
- if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
- ptr = ptr + nbytes;
- nbytes = sizeof(struct gfs2_quota) - nbytes;
- offset = 0;
- index++;
- goto get_a_page;
+ err = gfs2_write_disk_quota(ip, &q, loc);
+ if (!err) {
+ size = loc + sizeof(struct gfs2_quota);
+ if (size > inode->i_size)
+ i_size_write(inode, size);
+ inode->i_mtime = inode->i_atime = CURRENT_TIME;
+ mark_inode_dirty(inode);
+ set_bit(QDF_REFRESH, &qd->qd_flags);
}
- size = loc + sizeof(struct gfs2_quota);
- if (size > inode->i_size)
- i_size_write(inode, size);
- inode->i_mtime = inode->i_atime = CURRENT_TIME;
- mark_inode_dirty(inode);
- set_bit(QDF_REFRESH, &qd->qd_flags);
- return 0;
-
-unlock_out:
- unlock_page(page);
- page_cache_release(page);
return err;
}
/* If no min_target specified or we don't meet
* min_target, return -EDQUOT */
if (!ap->min_target || ap->min_target > ap->allowed) {
- print_message(qd, "exceeded");
- quota_send_warning(qd->qd_id,
- sdp->sd_vfs->s_dev,
- QUOTA_NL_BHARDWARN);
+ if (!test_and_set_bit(QDF_QMSG_QUIET,
+ &qd->qd_flags)) {
+ print_message(qd, "exceeded");
+ quota_send_warning(qd->qd_id,
+ sdp->sd_vfs->s_dev,
+ QUOTA_NL_BHARDWARN);
+ }
error = -EDQUOT;
break;
}
/* Apply changes */
error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
+ if (!error)
+ clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
gfs2_trans_end(sdp);
out_release:
projects / karo-tx-linux.git / blobdiff