/* mountpoint management * * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include #include #include #include #include "internal.h" static struct dentry *afs_mntpt_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); static int afs_mntpt_open(struct inode *inode, struct file *file); static void afs_mntpt_expiry_timed_out(struct work_struct *work); const struct file_operations afs_mntpt_file_operations = { .open = afs_mntpt_open, .llseek = noop_llseek, }; const struct inode_operations afs_mntpt_inode_operations = { .lookup = afs_mntpt_lookup, .readlink = page_readlink, .getattr = afs_getattr, }; const struct inode_operations afs_autocell_inode_operations = { .getattr = afs_getattr, }; static LIST_HEAD(afs_vfsmounts); static DECLARE_DELAYED_WORK(afs_mntpt_expiry_timer, afs_mntpt_expiry_timed_out); static unsigned long afs_mntpt_expiry_timeout = 10 * 60; /* * check a symbolic link to see whether it actually encodes a mountpoint * - sets the AFS_VNODE_MOUNTPOINT flag on the vnode appropriately */ int afs_mntpt_check_symlink(struct afs_vnode *vnode, struct key *key) { struct page *page; size_t size; char *buf; int ret; _enter("{%x:%u,%u}", vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique); /* read the contents of the symlink into the pagecache */ page = read_cache_page(AFS_VNODE_TO_I(vnode)->i_mapping, 0, afs_page_filler, key); if (IS_ERR(page)) { ret = PTR_ERR(page); goto out; } ret = -EIO; if (PageError(page)) goto out_free; buf = kmap(page); /* examine the symlink's contents */ size = vnode->status.size; _debug("symlink to %*.*s", (int) size, (int) size, buf); if (size > 2 && (buf[0] == '%' || buf[0] == '#') && buf[size - 1] == '.' ) { _debug("symlink is a mountpoint"); spin_lock(&vnode->lock); set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); vnode->vfs_inode.i_flags |= S_AUTOMOUNT; spin_unlock(&vnode->lock); } ret = 0; kunmap(page); out_free: put_page(page); out: _leave(" = %d", ret); return ret; } /* * no valid lookup procedure on this sort of dir */ static struct dentry *afs_mntpt_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { _enter("%p,%p{%pd2}", dir, dentry, dentry); return ERR_PTR(-EREMOTE); } /* * no valid open procedure on this sort of dir */ static int afs_mntpt_open(struct inode *inode, struct file *file) { _enter("%p,%p{%pD2}", inode, file, file); return -EREMOTE; } /* * create a vfsmount to be automounted */ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt) { struct afs_super_info *super; struct vfsmount *mnt; struct afs_vnode *vnode; struct page *page; char *devname, *options; bool rwpath = false; int ret; _enter("{%pd}", mntpt); BUG_ON(!d_inode(mntpt)); ret = -ENOMEM; devname = (char *) get_zeroed_page(GFP_KERNEL); if (!devname) goto error_no_devname; options = (char *) get_zeroed_page(GFP_KERNEL); if (!options) goto error_no_options; vnode = AFS_FS_I(d_inode(mntpt)); if (test_bit(AFS_VNODE_PSEUDODIR, &vnode->flags)) { /* if the directory is a pseudo directory, use the d_name */ static const char afs_root_cell[] = ":root.cell."; unsigned size = mntpt->d_name.len; ret = -ENOENT; if (size < 2 || size > AFS_MAXCELLNAME) goto error_no_page; if (mntpt->d_name.name[0] == '.') { devname[0] = '#'; memcpy(devname + 1, mntpt->d_name.name, size - 1); memcpy(devname + size, afs_root_cell, sizeof(afs_root_cell)); rwpath = true; } else { devname[0] = '%'; memcpy(devname + 1, mntpt->d_name.name, size); memcpy(devname + size + 1, afs_root_cell, sizeof(afs_root_cell)); } } else { /* read the contents of the AFS special symlink */ loff_t size = i_size_read(d_inode(mntpt)); char *buf; ret = -EINVAL; if (size > PAGE_SIZE - 1) goto error_no_page; page = read_mapping_page(d_inode(mntpt)->i_mapping, 0, NULL); if (IS_ERR(page)) { ret = PTR_ERR(page); goto error_no_page; } ret = -EIO; if (PageError(page)) goto error; buf = kmap_atomic(page); memcpy(devname, buf, size); kunmap_atomic(buf); put_page(page); page = NULL; } /* work out what options we want */ super = AFS_FS_S(mntpt->d_sb); memcpy(options, "cell=", 5); strcpy(options + 5, super->volume->cell->name); if (super->volume->type == AFSVL_RWVOL || rwpath) strcat(options, ",rwpath"); /* try and do the mount */ _debug("--- attempting mount %s -o %s ---", devname, options); mnt = vfs_kern_mount(&afs_fs_type, 0, devname, options); _debug("--- mount result %p ---", mnt); free_page((unsigned long) devname); free_page((unsigned long) options); _leave(" = %p", mnt); return mnt; error: put_page(page); error_no_page: free_page((unsigned long) options); error_no_options: free_page((unsigned long) devname); error_no_devname: _leave(" = %d", ret); return ERR_PTR(ret); } /* * handle an automount point */ struct vfsmount *afs_d_automount(struct path *path) { struct vfsmount *newmnt; _enter("{%pd}", path->dentry); newmnt = afs_mntpt_do_automount(path->dentry); if (IS_ERR(newmnt)) return newmnt; mntget(newmnt); /* prevent immediate expiration */ mnt_set_expiry(newmnt, &afs_vfsmounts); queue_delayed_work(afs_wq, &afs_mntpt_expiry_timer, afs_mntpt_expiry_timeout * HZ); _leave(" = %p", newmnt); return newmnt; } /* * handle mountpoint expiry timer going off */ static void afs_mntpt_expiry_timed_out(struct work_struct *work) { _enter(""); if (!list_empty(&afs_vfsmounts)) { mark_mounts_for_expiry(&afs_vfsmounts); queue_delayed_work(afs_wq, &afs_mntpt_expiry_timer, afs_mntpt_expiry_timeout * HZ); } _leave(""); } /* * kill the AFS mountpoint timer if it's still running */ void afs_mntpt_kill_timer(void) { _enter(""); ASSERT(list_empty(&afs_vfsmounts)); cancel_delayed_work_sync(&afs_mntpt_expiry_timer); } mit-msg'>Pull ARM SoC fixes from Arnd Bergmann: "This is a rather large set of bugfixes, as we just returned from the Christmas break. Most of these are relatively unimportant fixes for regressions introduced during the merge window, and about half of the changes are for mach-omap2. A couple of patches are just cleanups and dead code removal that I would not normally have considered for merging after -rc2, but I decided to take them along with the fixes this time. Notable fixes include: - removing the skeleton.dtsi include broke a number of machines, and we have to put empty /chosen nodes back to be able to pass kernel command lines as before - enabling Samsung platforms no longer hardwires CONFIG_HZ to 200, as it had been for no good reason for a long time" * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (46 commits) MAINTAINERS: extend PSCI entry to cover the newly add PSCI checker code drivers: psci: annotate timer on stack to silence odebug messages ARM64: defconfig: enable DRM_MESON as module ARM64: dts: meson-gx: Add Graphic Controller nodes ARM64: dts: meson-gxl: fix GPIO include ARM: dts: imx6: Disable "weim" node in the dtsi files ARM: dts: qcom: apq8064: Add missing scm clock ARM: davinci: da8xx: Fix sleeping function called from invalid context ARM: davinci: Make __clk_{enable,disable} functions public ARM: davinci: da850: don't add emac clock to lookup table twice ARM: davinci: da850: fix infinite loop in clk_set_rate() ARM: i.MX: remove map_io callback ARM: dts: vf610-zii-dev-rev-b: Add missing newline ARM: dts: imx6qdl-nitrogen6x: remove duplicate iomux entry ARM: dts: imx31: fix AVIC base address ARM: dts: am572x-idk: Add gpios property to control PCIE_RESETn arm64: dts: vexpress: Support GICC_DIR operations ARM: dts: vexpress: Support GICC_DIR operations firmware: arm_scpi: fix reading sensor values on pre-1.0 SCPI firmwares arm64: dts: msm8996: Add required memory carveouts ...
Diffstat (limited to 'tools/perf/pmu-events')