/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * Copyright (c) 2012 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
#include "xfs_vnodeops.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
+#include "xfs_symlink.h"
-/*
- * The maximum pathlen is 1024 bytes. Since the minimum file system
- * blocksize is 512 bytes, we can get a max of 2 extents back from
- * bmapi.
- */
-#define SYMLINK_MAPS 2
-
-STATIC int
-xfs_readlink_bmap(
- xfs_inode_t *ip,
- char *link)
-{
- xfs_mount_t *mp = ip->i_mount;
- int pathlen = ip->i_d.di_size;
- int nmaps = SYMLINK_MAPS;
- xfs_bmbt_irec_t mval[SYMLINK_MAPS];
- xfs_daddr_t d;
- int byte_cnt;
- int n;
- xfs_buf_t *bp;
- int error = 0;
-
- error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps,
- 0);
- if (error)
- goto out;
-
- for (n = 0; n < nmaps; n++) {
- d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
- byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
-
- bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0, NULL);
- if (!bp)
- return XFS_ERROR(ENOMEM);
- error = bp->b_error;
- if (error) {
- xfs_buf_ioerror_alert(bp, __func__);
- xfs_buf_relse(bp);
- goto out;
- }
- if (pathlen < byte_cnt)
- byte_cnt = pathlen;
- pathlen -= byte_cnt;
-
- memcpy(link, bp->b_addr, byte_cnt);
- xfs_buf_relse(bp);
- }
-
- link[ip->i_d.di_size] = '\0';
- error = 0;
-
- out:
- return error;
-}
-
-int
-xfs_readlink(
- xfs_inode_t *ip,
- char *link)
-{
- xfs_mount_t *mp = ip->i_mount;
- xfs_fsize_t pathlen;
- int error = 0;
-
- trace_xfs_readlink(ip);
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- xfs_ilock(ip, XFS_ILOCK_SHARED);
-
- pathlen = ip->i_d.di_size;
- if (!pathlen)
- goto out;
-
- if (pathlen < 0 || pathlen > MAXPATHLEN) {
- xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
- __func__, (unsigned long long) ip->i_ino,
- (long long) pathlen);
- ASSERT(0);
- error = XFS_ERROR(EFSCORRUPTED);
- goto out;
- }
-
-
- if (ip->i_df.if_flags & XFS_IFINLINE) {
- memcpy(link, ip->i_df.if_u1.if_data, pathlen);
- link[pathlen] = '\0';
- } else {
- error = xfs_readlink_bmap(ip, link);
- }
-
- out:
- xfs_iunlock(ip, XFS_ILOCK_SHARED);
- return error;
-}
/*
* This is called by xfs_inactive to free any blocks beyond eof
return error;
}
-/*
- * Free a symlink that has blocks associated with it.
- */
-STATIC int
-xfs_inactive_symlink_rmt(
- xfs_inode_t *ip,
- xfs_trans_t **tpp)
-{
- xfs_buf_t *bp;
- int committed;
- int done;
- int error;
- xfs_fsblock_t first_block;
- xfs_bmap_free_t free_list;
- int i;
- xfs_mount_t *mp;
- xfs_bmbt_irec_t mval[SYMLINK_MAPS];
- int nmaps;
- xfs_trans_t *ntp;
- int size;
- xfs_trans_t *tp;
-
- tp = *tpp;
- mp = ip->i_mount;
- ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip));
- /*
- * We're freeing a symlink that has some
- * blocks allocated to it. Free the
- * blocks here. We know that we've got
- * either 1 or 2 extents and that we can
- * free them all in one bunmapi call.
- */
- ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2);
-
- /*
- * Lock the inode, fix the size, and join it to the transaction.
- * Hold it so in the normal path, we still have it locked for
- * the second transaction. In the error paths we need it
- * held so the cancel won't rele it, see below.
- */
- size = (int)ip->i_d.di_size;
- ip->i_d.di_size = 0;
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- /*
- * Find the block(s) so we can inval and unmap them.
- */
- done = 0;
- xfs_bmap_init(&free_list, &first_block);
- nmaps = ARRAY_SIZE(mval);
- error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size),
- mval, &nmaps, 0);
- if (error)
- goto error0;
- /*
- * Invalidate the block(s).
- */
- for (i = 0; i < nmaps; i++) {
- bp = xfs_trans_get_buf(tp, mp->m_ddev_targp,
- XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
- XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0);
- if (!bp) {
- error = ENOMEM;
- goto error1;
- }
- xfs_trans_binval(tp, bp);
- }
- /*
- * Unmap the dead block(s) to the free_list.
- */
- if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps,
- &first_block, &free_list, &done)))
- goto error1;
- ASSERT(done);
- /*
- * Commit the first transaction. This logs the EFI and the inode.
- */
- if ((error = xfs_bmap_finish(&tp, &free_list, &committed)))
- goto error1;
- /*
- * The transaction must have been committed, since there were
- * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
- * The new tp has the extent freeing and EFDs.
- */
- ASSERT(committed);
- /*
- * The first xact was committed, so add the inode to the new one.
- * Mark it dirty so it will be logged and moved forward in the log as
- * part of every commit.
- */
- xfs_trans_ijoin(tp, ip, 0);
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- /*
- * Get a new, empty transaction to return to our caller.
- */
- ntp = xfs_trans_dup(tp);
- /*
- * Commit the transaction containing extent freeing and EFDs.
- * If we get an error on the commit here or on the reserve below,
- * we need to unlock the inode since the new transaction doesn't
- * have the inode attached.
- */
- error = xfs_trans_commit(tp, 0);
- tp = ntp;
- if (error) {
- ASSERT(XFS_FORCED_SHUTDOWN(mp));
- goto error0;
- }
- /*
- * transaction commit worked ok so we can drop the extra ticket
- * reference that we gained in xfs_trans_dup()
- */
- xfs_log_ticket_put(tp->t_ticket);
-
- /*
- * Remove the memory for extent descriptions (just bookkeeping).
- */
- if (ip->i_df.if_bytes)
- xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
- ASSERT(ip->i_df.if_bytes == 0);
- /*
- * Put an itruncate log reservation in the new transaction
- * for our caller.
- */
- if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) {
- ASSERT(XFS_FORCED_SHUTDOWN(mp));
- goto error0;
- }
-
- xfs_trans_ijoin(tp, ip, 0);
- *tpp = tp;
- return 0;
-
- error1:
- xfs_bmap_cancel(&free_list);
- error0:
- return error;
-}
-
int
xfs_release(
xfs_inode_t *ip)
xfs_trans_ijoin(tp, ip, 0);
if (S_ISLNK(ip->i_d.di_mode)) {
- /*
- * Zero length symlinks _can_ exist.
- */
- if (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) {
- error = xfs_inactive_symlink_rmt(ip, &tp);
- if (error)
- goto out_cancel;
- } else if (ip->i_df.if_bytes > 0) {
- xfs_idata_realloc(ip, -(ip->i_df.if_bytes),
- XFS_DATA_FORK);
- ASSERT(ip->i_df.if_bytes == 0);
- }
+ error = xfs_inactive_symlink(ip, &tp);
+ if (error)
+ goto out_cancel;
} else if (truncate) {
ip->i_d.di_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
return error;
}
-int
-xfs_symlink(
- xfs_inode_t *dp,
- struct xfs_name *link_name,
- const char *target_path,
- umode_t mode,
- xfs_inode_t **ipp)
-{
- xfs_mount_t *mp = dp->i_mount;
- xfs_trans_t *tp;
- xfs_inode_t *ip;
- int error;
- int pathlen;
- xfs_bmap_free_t free_list;
- xfs_fsblock_t first_block;
- bool unlock_dp_on_error = false;
- uint cancel_flags;
- int committed;
- xfs_fileoff_t first_fsb;
- xfs_filblks_t fs_blocks;
- int nmaps;
- xfs_bmbt_irec_t mval[SYMLINK_MAPS];
- xfs_daddr_t d;
- const char *cur_chunk;
- int byte_cnt;
- int n;
- xfs_buf_t *bp;
- prid_t prid;
- struct xfs_dquot *udqp, *gdqp;
- uint resblks;
-
- *ipp = NULL;
- error = 0;
- ip = NULL;
- tp = NULL;
-
- trace_xfs_symlink(dp, link_name);
-
- if (XFS_FORCED_SHUTDOWN(mp))
- return XFS_ERROR(EIO);
-
- /*
- * Check component lengths of the target path name.
- */
- pathlen = strlen(target_path);
- if (pathlen >= MAXPATHLEN) /* total string too long */
- return XFS_ERROR(ENAMETOOLONG);
-
- udqp = gdqp = NULL;
- if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
- prid = xfs_get_projid(dp);
- else
- prid = XFS_PROJID_DEFAULT;
-
- /*
- * Make sure that we have allocated dquot(s) on disk.
- */
- error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid,
- XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp);
- if (error)
- goto std_return;
-
- tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK);
- cancel_flags = XFS_TRANS_RELEASE_LOG_RES;
- /*
- * The symlink will fit into the inode data fork?
- * There can't be any attributes so we get the whole variable part.
- */
- if (pathlen <= XFS_LITINO(mp))
- fs_blocks = 0;
- else
- fs_blocks = XFS_B_TO_FSB(mp, pathlen);
- resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
- error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
- if (error == ENOSPC && fs_blocks == 0) {
- resblks = 0;
- error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0,
- XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT);
- }
- if (error) {
- cancel_flags = 0;
- goto error_return;
- }
-
- xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
- unlock_dp_on_error = true;
-
- /*
- * Check whether the directory allows new symlinks or not.
- */
- if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) {
- error = XFS_ERROR(EPERM);
- goto error_return;
- }
-
- /*
- * Reserve disk quota : blocks and inode.
- */
- error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0);
- if (error)
- goto error_return;
-
- /*
- * Check for ability to enter directory entry, if no space reserved.
- */
- error = xfs_dir_canenter(tp, dp, link_name, resblks);
- if (error)
- goto error_return;
- /*
- * Initialize the bmap freelist prior to calling either
- * bmapi or the directory create code.
- */
- xfs_bmap_init(&free_list, &first_block);
-
- /*
- * Allocate an inode for the symlink.
- */
- error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0,
- prid, resblks > 0, &ip, NULL);
- if (error) {
- if (error == ENOSPC)
- goto error_return;
- goto error1;
- }
-
- /*
- * An error after we've joined dp to the transaction will result in the
- * transaction cancel unlocking dp so don't do it explicitly in the
- * error path.
- */
- xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
- unlock_dp_on_error = false;
-
- /*
- * Also attach the dquot(s) to it, if applicable.
- */
- xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp);
-
- if (resblks)
- resblks -= XFS_IALLOC_SPACE_RES(mp);
- /*
- * If the symlink will fit into the inode, write it inline.
- */
- if (pathlen <= XFS_IFORK_DSIZE(ip)) {
- xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK);
- memcpy(ip->i_df.if_u1.if_data, target_path, pathlen);
- ip->i_d.di_size = pathlen;
-
- /*
- * The inode was initially created in extent format.
- */
- ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT);
- ip->i_df.if_flags |= XFS_IFINLINE;
-
- ip->i_d.di_format = XFS_DINODE_FMT_LOCAL;
- xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
-
- } else {
- first_fsb = 0;
- nmaps = SYMLINK_MAPS;
-
- error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
- XFS_BMAPI_METADATA, &first_block, resblks,
- mval, &nmaps, &free_list);
- if (error)
- goto error2;
-
- if (resblks)
- resblks -= fs_blocks;
- ip->i_d.di_size = pathlen;
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
-
- cur_chunk = target_path;
- for (n = 0; n < nmaps; n++) {
- d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
- byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
- bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
- BTOBB(byte_cnt), 0);
- if (!bp) {
- error = ENOMEM;
- goto error2;
- }
- if (pathlen < byte_cnt) {
- byte_cnt = pathlen;
- }
- pathlen -= byte_cnt;
-
- memcpy(bp->b_addr, cur_chunk, byte_cnt);
- cur_chunk += byte_cnt;
-
- xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1);
- }
- }
-
- /*
- * Create the directory entry for the symlink.
- */
- error = xfs_dir_createname(tp, dp, link_name, ip->i_ino,
- &first_block, &free_list, resblks);
- if (error)
- goto error2;
- xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
- xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
-
- /*
- * If this is a synchronous mount, make sure that the
- * symlink transaction goes to disk before returning to
- * the user.
- */
- if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) {
- xfs_trans_set_sync(tp);
- }
-
- error = xfs_bmap_finish(&tp, &free_list, &committed);
- if (error) {
- goto error2;
- }
- error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
- xfs_qm_dqrele(udqp);
- xfs_qm_dqrele(gdqp);
-
- *ipp = ip;
- return 0;
-
- error2:
- IRELE(ip);
- error1:
- xfs_bmap_cancel(&free_list);
- cancel_flags |= XFS_TRANS_ABORT;
- error_return:
- xfs_trans_cancel(tp, cancel_flags);
- xfs_qm_dqrele(udqp);
- xfs_qm_dqrele(gdqp);
-
- if (unlock_dp_on_error)
- xfs_iunlock(dp, XFS_ILOCK_EXCL);
- std_return:
- return error;
-}
-
int
xfs_set_dmattrs(
xfs_inode_t *ip,
xfs_mount_t *mp;
int nimap;
uint resblks;
- uint rounding;
+ xfs_off_t rounding;
int rt;
xfs_fileoff_t startoffset_fsb;
xfs_trans_t *tp;
inode_dio_wait(VFS_I(ip));
}
- rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
+ rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
ioffset = offset & ~(rounding - 1);
error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
ioffset, -1);
projects / mirror_ubuntu-artful-kernel.git / blobdiff